AzureRelayReceiver Control

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An Azure Relay Service listener to accept and communicate with clients.

Syntax

AzureRelayReceiver

Remarks

The AzureRelayReceiver control implements the listener role in the Azure Relay service. The control will connect to the server and listen for incoming connections. Once a connection is established data can be exchange freely in both directions allowing a flexible messaging environment.

Authenticating and Listening

Authentication to Azure Relay is performed using the Shared Access Key Name and Shared Access Key created from the Azure portal for the Relay. To begin listening for incoming connections set Listening to True.

When set to True the control will immediately attempt to make a connection to the Azure Relay Service and begin listening. The following properties are applicable when setting Listening:

• AccessKey (required)
• AccessKeyName (required)
• HybridConnection (required)
• NamespaceAddress (required)
• DefaultTimeout
• ForwardingHost
• ForwardingPort

To stop listening set Listening to False. To shutdown the server including existing connections call Shutdown.

Handling Connections

When a connection is made the ConnectionRequest event fires with information about the connecting client. From within this event the client connection may be accepted (default) or rejected.

If the client connection is accepted the ConnectionConnected and ConnectionReadyToSend events fire when the connection completes and is ready to send and receive data.

When data is received from the client the ConnectionDataIn event fires with the received data.

To send data to the client set AzureRelayConnectionDataToSend or call Send, SendFile, or SendText.

When the client disconnects the ConnectionDisconnected event fires. To initiate the client disconnection call Disconnect.

Handling HTTP Connections

Azure Relay also supports HTTP connections which follow a request/response model. When an HTTP request is received the HTTPRequest event fires with information about the request including the request body. Save the ConnectionId value obtained within HTTPRequest for use with SendHTTPResponse.

To send a HTTP response call SendHTTPResponse with the ConnectionId, status code and description, and any response day to be sent back to the client.

Forwarding Connections

The control supports forwarding incoming connection to a separate destination. This functionality allows AzureRelayReceiver to act as a proxy for incoming requests. When ForwardingHost and ForwardingPort are set anytime a connection is made the control will establish a separate connection to the ForwardingHost and forward all incoming traffic. Responses from the ForwardingHost are then automatically sent back over the connection.

When connection forwarding is used no special steps are needed to send or receive data. Data flows freely between the connected client and the ForwardingHost.

Note: Forwarding is not supported for HTTP requests.

Code Example (WebSockets)

Azurerelayreceiver listener = new Azurerelayreceiver(); listener.AccessKey = "9oKRDwjl0s440MlLUi4qHxDL34j1FS6K3t5TRoJ216c="; listener.AccessKeyName = "RootManageSharedAccessKey"; listener.NamespaceAddress = "myrelay.servicebus.windows.net"; listener.HybridConnection = "hc1"; listener.OnConnectionRequest += (s, e) => { Console.WriteLine("Connection Request From: " + e.RemoteAddress + ":" + e.RemotePort); e.Accept = true; }; listener.OnConnectionReadyToSend += (s, e) => { Console.WriteLine("Connection [" + e.ConnectionId + "] connected and ready to send and receive."); }; listener.OnConnectionDataIn += (s, e) => { Console.WriteLine("Received data from " + e.ConnectionId + ": " + e.Text); //echo the data back listener.SendText(e.ConnectionId, e.Text); Console.WriteLine("Echoed received data back"); }; listener.Listening = true; while (true) listener.DoEvents();

Code Example (HTTP)

Azurerelaylistener listener = new Azurerelaylistener(); listener.AccessKey = "9oKRDwjl0s440MlLUi4qHxDL34j1FS6K3t5TRoJ216c="; listener.AccessKeyName = "RootManageSharedAccessKey"; listener.NamespaceAddress = "myrelay.servicebus.windows.net"; listener.HybridConnection = "hc1"; listener.OnHTTPRequest += (s, e) => { Console.WriteLine("HTTP Request from " + e.RemoteAddress + ":" + e.RemotePort); Console.WriteLine("HTTP Method: " + e.RequestMethod); Console.WriteLine("HTTP Request: " + e.RequestData); myConnectionId = e.ConnectionId; }; //Send a response using the ConnectionId value from the HTTPRequest event listener.SendHTTPResponse(myConnectionId, 200, "OK", myResponseBody);

Property List

The following is the full list of the properties of the control with short descriptions. Click on the links for further details.

Method List

The following is the full list of the methods of the control with short descriptions. Click on the links for further details.

Event List

The following is the full list of the events fired by the control with short descriptions. Click on the links for further details.

Config Settings

The following is a list of config settings for the control with short descriptions. Click on the links for further details.

AccessKey Property (AzureRelayReceiver Control)

The Shared Access Key.

Syntax

azurerelayreceivercontrol.AccessKey[=string]

Default Value

""

Remarks

This property specifies the Shared Access Key to use when authenticating. This is the primary or secondary key of the shared access policy created in the Azure portal. For instance 8oKRDwkl0s440MlLUi4qHxDL34j1FS6K3t5TRoJ216c=.

Data Type

String

AccessKeyName Property (AzureRelayReceiver Control)

The Shared Access Key Name.

Syntax

azurerelayreceivercontrol.AccessKeyName[=string]

Default Value

""

Remarks

This property specifies the Shared Access Key name to use when authenticating. This is the name of the shared access policy created in the Azure portal. For instance RootManageSharedAccessKey.

Data Type

String

Connected Property (AzureRelayReceiver Control)

This shows whether the control is connected.

Syntax

azurerelayreceivercontrol.Connected[=boolean]

Default Value

False

Remarks

This property is used to determine whether or not the control is connected to the remote host.

Note: It is recommended to use the Connect or Disconnect method instead of setting this property.

This property is not available at design time.

Data Type

Boolean

AzureRelayConnectionCount Property (AzureRelayReceiver Control)

The number of records in the AzureRelayConnection arrays.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionCount

Default Value

0

Remarks

This property controls the size of the following arrays:

• AzureRelayConnectionAcceptData
• AzureRelayConnectionAddress
• AzureRelayConnectionBytesSent
• AzureRelayConnectionConnected
• AzureRelayConnectionConnectHeaders
• AzureRelayConnectionConnectionId
• AzureRelayConnectionDataFormat
• AzureRelayConnectionDataToSend
• AzureRelayConnectionExtensions
• AzureRelayConnectionHost
• AzureRelayConnectionId
• AzureRelayConnectionReadyToSend
• AzureRelayConnectionRemoteAddress
• AzureRelayConnectionRemotePort
• AzureRelayConnectionSubProtocols
• AzureRelayConnectionTimeout

The array indices start at 0 and end at AzureRelayConnectionCount - 1.

This property is read-only and not available at design time.

Data Type

Integer

AzureRelayConnectionAcceptData Property (AzureRelayReceiver Control)

Setting this property to False, temporarily disables data reception (and the ConnectionDataIn event) on the connection.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionAcceptData(ConnectionId)[=boolean]

Default Value

True

Remarks

Setting this property to False, temporarily disables data reception (and the ConnectionDataIn event) on the connection. Setting this to True, re-enables data reception.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is not available at design time.

Data Type

Boolean

AzureRelayConnectionAddress Property (AzureRelayReceiver Control)

This property holds the rendezvous URL to which the connection specific websocket connection will be made.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionAddress(ConnectionId)

Default Value

""

Remarks

This property holds the rendezvous URL to which the connection specific websocket connection will be made. This is for information only, no action needs to be taken based on this value. For instance: wss://g21-prod-by3-003-sb.servicebus.windows.net/$hc/hc1?sb-hc-action=accept&sb-hc-id=2d4acb89-7d15-4aeb-bcd5-66e031580a90_G21_G1

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is read-only and not available at design time.

Data Type

String

AzureRelayConnectionBytesSent Property (AzureRelayReceiver Control)

This property shows how many bytes were sent after the last assignment to DataToSend .

Syntax

azurerelayreceivercontrol.AzureRelayConnectionBytesSent(ConnectionId)

Default Value

0

Remarks

This property shows how many bytes were sent after the last assignment to AzureRelayConnectionDataToSend. Please check AzureRelayConnectionDataToSend for more information.

Note: This property will always return 0 when the control is operating in the synchronous mode (i.e., the AzureRelayConnectionTimeout property is set to a positive value).

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is read-only and not available at design time.

Data Type

Integer

AzureRelayConnectionConnected Property (AzureRelayReceiver Control)

This property is used to disconnect individual connections and/or show their status.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionConnected(ConnectionId)[=boolean]

Default Value

False

Remarks

This property is used to disconnect individual connections and/or show their status.

The AzureRelayConnectionConnected property may be set to false to close the connection.

AzureRelayConnectionConnected also shows the status of a particular connection (connected/disconnected).

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is not available at design time.

Data Type

Boolean

AzureRelayConnectionConnectHeaders Property (AzureRelayReceiver Control)

A JSON object containing the HTTP headers that have been supplied by the sender to the Azure Relay service.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionConnectHeaders(ConnectionId)

Default Value

""

Remarks

A JSON object containing the HTTP headers that have been supplied by the sender to the Azure Relay service. For instance:

"connectHeaders": {
	"Sec-WebSocket-Key": "QocLBwK5J40Qp35L2duoBg==",
	"Sec-WebSocket-Version": "13",
	"Origin": "null",
	"Connection": "Upgrade",
	"Upgrade": "websocket",
	"Accept-Encoding": "gzip, deflate",
	"Host": "nstest.servicebus.windows.net",
	"User-Agent": "IPWorks HTTP Component - www.nsoftware.com"
}

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is read-only and not available at design time.

Data Type

String

AzureRelayConnectionConnectionId Property (AzureRelayReceiver Control)

This property contains an identifier generated by the control to identify each connection.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionConnectionId(ConnectionId)

Default Value

""

Remarks

This property contains an identifier generated by the control to identify each connection. This identifier is unique to this connection.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is read-only and not available at design time.

Data Type

String

AzureRelayConnectionDataFormat Property (AzureRelayReceiver Control)

The format of the data being sent.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionDataFormat(ConnectionId)[=integer]

Possible Values

dfAutomatic(0), 
dfText(1), 
dfBinary(2), 
dfPing(9), 
dfPong(10)

Default Value

0

Remarks

The format of the data being sent. When data is sent over an established connection it is either considered as text or binary data. Text data is UTF-8 encoded. Binary data has no encoding associated with it.

Possible values are:

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is not available at design time.

Data Type

Integer

AzureRelayConnectionDataToSend Property (AzureRelayReceiver Control)

This property contains a string of data to be sent to the remote host.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionDataToSend(ConnectionId)[=string]

Default Value

""

Remarks

This property contains a string of data to be sent to the remote host. Write-only property.

Assigning a string to the AzureRelayConnectionDataToSend makes the control send the string to the remote host. The Send method provides similar functionality.

If you are sending data to the remote host faster than it can process it, or faster than the network's bandwidth allows, the outgoing queue might fill up. When this happens, the operation fails with error 25036: "[10035] Operation would block" (WSAEWOULDBLOCK). You can trap this error, and then try to send the data again. . The BytesSent property shows how many bytes were sent (if any). If 0 bytes were sent, then you can wait for the ReadyToSend event before attempting to send data again.

Note: The ReadyToSend event is not fired when part of the data is sent successfully.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

To read or write binary data to the property, a Variant (Byte Array) version is provided in .AzureRelayConnectionDataToSendB.

This property is write-only and not available at design time.

Data Type

Binary String

AzureRelayConnectionExtensions Property (AzureRelayReceiver Control)

The WebSocket extensions sent by the client in the initial WebSocket connection request.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionExtensions(ConnectionId)

Default Value

""

Remarks

The WebSocket extensions sent by the client in the initial WebSocket connection request.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is read-only and not available at design time.

Data Type

String

AzureRelayConnectionHost Property (AzureRelayReceiver Control)

The Host header value of the connected client.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionHost(ConnectionId)

Default Value

""

Remarks

The Host header value of the connected client.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is read-only and not available at design time.

Data Type

String

AzureRelayConnectionId Property (AzureRelayReceiver Control)

This property holds the Id of the connection.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionId(ConnectionId)

Default Value

""

Remarks

This property holds the Id of the connection. If an Id was specified by the client it is present here, otherwise the Azure Relay service generates a value. For instance: 2d4acb89-7d15-4aeb-bcd5-66e031580a90_G21_G1.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is read-only and not available at design time.

Data Type

String

AzureRelayConnectionReadyToSend Property (AzureRelayReceiver Control)

This indicates whether the control is ready to send data.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionReadyToSend(ConnectionId)

Default Value

False

Remarks

This indicates whether the control is ready to send data.

This property indicates that the underlying TCP/IP subsystem is ready to accept data. This is True after a client connects but will become False after a failed AzureRelayConnectionDataToSend.

After a failed AzureRelayConnectionDataToSend, the ReadyToSend event will fire and this property will be True when data can be sent again.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is read-only and not available at design time.

Data Type

Boolean

AzureRelayConnectionRemoteAddress Property (AzureRelayReceiver Control)

This property holds the IP address of the connecting client.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionRemoteAddress(ConnectionId)

Default Value

""

Remarks

This property holds the IP address of the connecting client.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is read-only and not available at design time.

Data Type

String

AzureRelayConnectionRemotePort Property (AzureRelayReceiver Control)

This property holds the port of the connecting client.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionRemotePort(ConnectionId)

Default Value

0

Remarks

This property holds the port of the connecting client.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is read-only and not available at design time.

Data Type

Integer

AzureRelayConnectionSubProtocols Property (AzureRelayReceiver Control)

The subprotocols (application-level protocols layered over the WebSocket Protocol) sent by the client in the initial WebSocket connection request.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionSubProtocols(ConnectionId)

Default Value

""

Remarks

The subprotocols (application-level protocols layered over the WebSocket Protocol) sent by the client in the initial WebSocket connection request.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is read-only and not available at design time.

Data Type

String

AzureRelayConnectionTimeout Property (AzureRelayReceiver Control)

This property specifies a timeout for the control.

Syntax

azurerelayreceivercontrol.AzureRelayConnectionTimeout(ConnectionId)[=integer]

Default Value

0

Remarks

This property specifies a timeout for the control.

If the AzureRelayConnectionTimeout property is set to 0, all operations return immediately, potentially failing with a WOULDBLOCK error if data cannot be sent immediately.

If AzureRelayConnectionTimeout is set to a positive value, data is sent in a blocking manner and the control will wait for the operation to complete before returning control. The control will handle any potential WOULDBLOCK errors internally and automatically retry the operation for a maximum of AzureRelayConnectionTimeout seconds.

The control will use DoEvents to enter an efficient wait loop during any potential waiting period, making sure that all system events are processed immediately as they arrive. This ensures that the host application does not "freeze" and remains responsive.

If Timeout expires, and the operation is not yet complete, the control fails with an error.

Please note that by default, all timeouts are inactivity timeouts, i.e. the timeout period is extended by Timeout seconds when any amount of data is successfully sent or received.

The default value for the AzureRelayConnectionTimeout property is 0(asynchronous operation).

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayConnectionCount property.

This property is not available at design time.

Data Type

Integer

DefaultTimeout Property (AzureRelayReceiver Control)

An initial timeout value to be used by incoming connections.

Syntax

azurerelayreceivercontrol.DefaultTimeout[=integer]

Default Value

0

Remarks

This property is used by the control to set the operational timeout value of all inbound connections once they are established.

By default, the timeout is 0, meaning that all inbound connections will behave asynchronously.

Data Type

Integer

FirewallAutoDetect Property (AzureRelayReceiver Control)

This property tells the control whether or not to automatically detect and use firewall system settings, if available.

Syntax

azurerelayreceivercontrol.FirewallAutoDetect[=boolean]

Default Value

False

Remarks

This property tells the control whether or not to automatically detect and use firewall system settings, if available.

Data Type

Boolean

FirewallType Property (AzureRelayReceiver Control)

This property determines the type of firewall to connect through.

Syntax

azurerelayreceivercontrol.FirewallType[=integer]

Possible Values

fwNone(0), 
fwTunnel(1), 
fwSOCKS4(2), 
fwSOCKS5(3), 
fwSOCKS4A(10)

Default Value

0

Remarks

This property determines the type of firewall to connect through. The applicable values are as follows:

Data Type

Integer

FirewallHost Property (AzureRelayReceiver Control)

This property contains the name or IP address of firewall (optional).

Syntax

azurerelayreceivercontrol.FirewallHost[=string]

Default Value

""

Remarks

This property contains the name or IP address of firewall (optional). If a FirewallHost is given, the requested connections will be authenticated through the specified firewall when connecting.

If this property is set to a Domain Name, a DNS request is initiated. Upon successful termination of the request, this property is set to the corresponding address. If the search is not successful, the control fails with an error.

Data Type

String

FirewallPassword Property (AzureRelayReceiver Control)

This property contains a password if authentication is to be used when connecting through the firewall.

Syntax

azurerelayreceivercontrol.FirewallPassword[=string]

Default Value

""

Remarks

This property contains a password if authentication is to be used when connecting through the firewall. If FirewallHost is specified, the FirewallUser and FirewallPassword properties are used to connect and authenticate to the given firewall. If the authentication fails, the control fails with an error.

Data Type

String

FirewallPort Property (AzureRelayReceiver Control)

This property contains the transmission control protocol (TCP) port for the firewall Host .

Syntax

azurerelayreceivercontrol.FirewallPort[=integer]

Default Value

0

Remarks

This property contains the transmission control protocol (TCP) port for the firewall FirewallHost. See the description of the FirewallHost property for details.

Note: This property is set automatically when FirewallType is set to a valid value. See the description of the FirewallType property for details.

Data Type

Integer

FirewallUser Property (AzureRelayReceiver Control)

This property contains a user name if authentication is to be used connecting through a firewall.

Syntax

azurerelayreceivercontrol.FirewallUser[=string]

Default Value

""

Remarks

This property contains a user name if authentication is to be used connecting through a firewall. If the FirewallHost is specified, this property and FirewallPassword properties are used to connect and authenticate to the given Firewall. If the authentication fails, the control fails with an error.

Data Type

String

ForwardingHost Property (AzureRelayReceiver Control)

The address to which traffic will automatically be forwarded.

Syntax

azurerelayreceivercontrol.ForwardingHost[=string]

Default Value

""

Remarks

ForwardingHost optionally specifies an address to which traffic will be automatically forwarded. Traffic will only be forwarded if both ForwardingHost and ForwardingPort are specified.

When a connection is made the control will automatically establish a connection to ForwardingHost on the port specified by ForwardingPort. Data will then flow freely between the connected client and the ForwardingHost.

Note: This functionality is not applicable to HTTP requests.

Data Type

String

ForwardingPort Property (AzureRelayReceiver Control)

The port to which traffic will automatically be forwarded.

Syntax

azurerelayreceivercontrol.ForwardingPort[=integer]

Default Value

0

Remarks

ForwardingPort is used together with ForwardingHost to define a location where traffic is automatically forwarded.

ForwardingHost optionally specifies an address to which traffic will be automatically forwarded. Traffic will only be forwarded if both ForwardingHost and ForwardingPort are specified.

When a connection is made the control will automatically establish a connection to ForwardingHost on the port specified by ForwardingPort. Data will then flow freely between the connected client and the ForwardingHost.

Note: This functionality is not applicable to HTTP requests.

Data Type

Integer

HybridConnection Property (AzureRelayReceiver Control)

The hybrid connection name.

Syntax

azurerelayreceivercontrol.HybridConnection[=string]

Default Value

""

Remarks

This setting specifies the name of the hybrid connection that was created in the Azure portal. For instance hc1.

Data Type

String

Listening Property (AzureRelayReceiver Control)

If , the control is listening for incoming connections.

Syntax

azurerelayreceivercontrol.Listening[=boolean]

Default Value

False

Remarks

This setting indicates whether the control accepts incoming connections. When the control has connected to the Azure Service and started listening for incoming connections. The initiate the conenction and begin listening clal the StartListening method.

Note: Use the StartListening and StopListening methods to control whether the control is listening.

This property is not available at design time.

Data Type

Boolean

LocalHost Property (AzureRelayReceiver Control)

The name of the local host or user-assigned IP interface through which connections are initiated or accepted.

Syntax

azurerelayreceivercontrol.LocalHost[=string]

Default Value

""

Remarks

The LocalHost property contains the name of the local host as obtained by the gethostname() system call, or if the user has assigned an IP address, the value of that address.

In multi-homed hosts (machines with more than one IP interface) setting LocalHost to the value of an interface will make the control initiate connections (or accept in the case of server controls) only through that interface.

If the control is connected, the LocalHost property shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multi-homed hosts (machines with more than one IP interface).

NOTE: LocalHost is not persistent. You must always set it in code, and never in the property window.

Data Type

String

NamespaceAddress Property (AzureRelayReceiver Control)

The namespace address of the relay.

Syntax

azurerelayreceivercontrol.NamespaceAddress[=string]

Default Value

""

Remarks

This property specifies the full fully qualified domain name of the relay namespace. For instance myrelay.servicebus.windows.net.

Data Type

String

ProxyAuthScheme Property (AzureRelayReceiver Control)

This property is used to tell the control which type of authorization to perform when connecting to the proxy.

Syntax

azurerelayreceivercontrol.ProxyAuthScheme[=integer]

Possible Values

authBasic(0), 
authDigest(1), 
authProprietary(2), 
authNone(3), 
authNtlm(4), 
authNegotiate(5)

Default Value

0

Remarks

This property is used to tell the control which type of authorization to perform when connecting to the proxy. This is used only when the ProxyUser and ProxyPassword properties are set.

ProxyAuthScheme should be set to authNone (3) when no authentication is expected.

By default, ProxyAuthScheme is authBasic (0), and if the ProxyUser and ProxyPassword properties are set, the component will attempt basic authentication.

If ProxyAuthScheme is set to authDigest (1), digest authentication will be attempted instead.

If ProxyAuthScheme is set to authProprietary (2), then the authorization token will not be generated by the control. Look at the configuration file for the control being used to find more information about manually setting this token.

If ProxyAuthScheme is set to authNtlm (4), NTLM authentication will be used.

For security reasons, setting this property will clear the values of ProxyUser and ProxyPassword.

Data Type

Integer

ProxyAutoDetect Property (AzureRelayReceiver Control)

This property tells the control whether or not to automatically detect and use proxy system settings, if available.

Syntax

azurerelayreceivercontrol.ProxyAutoDetect[=boolean]

Default Value

False

Remarks

This property tells the control whether or not to automatically detect and use proxy system settings, if available. The default value is .

Data Type

Boolean

ProxyPassword Property (AzureRelayReceiver Control)

This property contains a password if authentication is to be used for the proxy.

Syntax

azurerelayreceivercontrol.ProxyPassword[=string]

Default Value

""

Remarks

This property contains a password if authentication is to be used for the proxy.

If ProxyAuthScheme is set to Basic Authentication, the ProxyUser and ProxyPassword are Base64 encoded and the proxy authentication token will be generated in the form Basic [encoded-user-password].

If ProxyAuthScheme is set to Digest Authentication, the ProxyUser and ProxyPassword properties are used to respond to the Digest Authentication challenge from the server.

If ProxyAuthScheme is set to NTLM Authentication, the ProxyUser and ProxyPassword properties are used to authenticate through NTLM negotiation.

Data Type

String

ProxyPort Property (AzureRelayReceiver Control)

This property contains the Transmission Control Protocol (TCP) port for the proxy Server (default 80).

Syntax

azurerelayreceivercontrol.ProxyPort[=integer]

Default Value

80

Remarks

This property contains the Transmission Control Protocol (TCP) port for the proxy ProxyServer (default 80). See the description of the ProxyServer property for details.

Data Type

Integer

ProxyServer Property (AzureRelayReceiver Control)

If a proxy Server is given, then the HTTP request is sent to the proxy instead of the server otherwise specified.

Syntax

azurerelayreceivercontrol.ProxyServer[=string]

Default Value

""

Remarks

If a proxy ProxyServer is given, then the HTTP request is sent to the proxy instead of the server otherwise specified.

If the ProxyServer property is set to a domain name, a DNS request is initiated. Upon successful termination of the request, the ProxyServer property is set to the corresponding address. If the search is not successful, an error is returned.

Data Type

String

ProxySSL Property (AzureRelayReceiver Control)

This property determines when to use a Secure Sockets Layer (SSL) for the connection to the proxy.

Syntax

azurerelayreceivercontrol.ProxySSL[=integer]

Possible Values

psAutomatic(0), 
psAlways(1), 
psNever(2), 
psTunnel(3)

Default Value

0

Remarks

This property determines when to use a Secure Sockets Layer (SSL) for the connection to the proxy. The applicable values are as follows:

Data Type

Integer

ProxyUser Property (AzureRelayReceiver Control)

This property contains a username if authentication is to be used for the proxy.

Syntax

azurerelayreceivercontrol.ProxyUser[=string]

Default Value

""

Remarks

This property contains a username if authentication is to be used for the proxy.

If ProxyAuthScheme is set to Basic Authentication, the ProxyUser and ProxyPassword properties are Base64 encoded and the proxy authentication token will be generated in the form Basic [encoded-user-password].

If ProxyAuthScheme is set to Digest Authentication, the ProxyUser and ProxyPassword properties are used to respond to the Digest Authentication challenge from the server.

If ProxyAuthScheme is set to NTLM Authentication, the ProxyUser and ProxyPassword properties are used to authenticate through NTLM negotiation.

Data Type

String

SSLAcceptServerCertEncoded Property (AzureRelayReceiver Control)

This is the certificate (PEM/Base64 encoded).

Syntax

azurerelayreceivercontrol.SSLAcceptServerCertEncoded[=string]

Default Value

""

Remarks

This is the certificate (PEM/Base64 encoded). This property is used to assign a specific certificate. The SSLAcceptServerCertStore and SSLAcceptServerCertSubject properties also may be used to specify a certificate.

When SSLAcceptServerCertEncoded is set, a search is initiated in the current SSLAcceptServerCertStore for the private key of the certificate. If the key is found, SSLAcceptServerCertSubject is updated to reflect the full subject of the selected certificate; otherwise, SSLAcceptServerCertSubject is set to an empty string.

To read or write binary data to the property, a Variant (Byte Array) version is provided in .SSLAcceptServerCertEncodedB.

This property is not available at design time.

Data Type

Binary String

SSLCertEncoded Property (AzureRelayReceiver Control)

This is the certificate (PEM/Base64 encoded).

Syntax

azurerelayreceivercontrol.SSLCertEncoded[=string]

Default Value

""

Remarks

This is the certificate (PEM/Base64 encoded). This property is used to assign a specific certificate. The SSLCertStore and SSLCertSubject properties also may be used to specify a certificate.

When SSLCertEncoded is set, a search is initiated in the current SSLCertStore for the private key of the certificate. If the key is found, SSLCertSubject is updated to reflect the full subject of the selected certificate; otherwise, SSLCertSubject is set to an empty string.

To read or write binary data to the property, a Variant (Byte Array) version is provided in .SSLCertEncodedB.

This property is not available at design time.

Data Type

Binary String

SSLCertStore Property (AzureRelayReceiver Control)

This is the name of the certificate store for the client certificate.

Syntax

azurerelayreceivercontrol.SSLCertStore[=string]

Default Value

"MY"

Remarks

This is the name of the certificate store for the client certificate.

The SSLCertStoreType property denotes the type of the certificate store specified by SSLCertStore. If the store is password protected, specify the password in SSLCertStorePassword.

SSLCertStore is used in conjunction with the SSLCertSubject property to specify client certificates. If SSLCertStore has a value, and SSLCertSubject or SSLCertEncoded is set, a search for a certificate is initiated. Please see the SSLCertSubject property for details.

Designations of certificate stores are platform dependent.

The following designations are the most common User and Machine certificate stores in Windows:

When the certificate store type is PFXFile, this property must be set to the name of the file. When the type is PFXBlob, the property must be set to the binary contents of a PFX file (i.e., PKCS#12 certificate store).

To read or write binary data to the property, a Variant (Byte Array) version is provided in .SSLCertStoreB.

Data Type

Binary String

SSLCertStorePassword Property (AzureRelayReceiver Control)

If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store.

Syntax

azurerelayreceivercontrol.SSLCertStorePassword[=string]

Default Value

""

Remarks

If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store.

Data Type

String

SSLCertStoreType Property (AzureRelayReceiver Control)

This is the type of certificate store for this certificate.

Syntax

azurerelayreceivercontrol.SSLCertStoreType[=integer]

Possible Values

cstUser(0), 
cstMachine(1), 
cstPFXFile(2), 
cstPFXBlob(3), 
cstJKSFile(4), 
cstJKSBlob(5), 
cstPEMKeyFile(6), 
cstPEMKeyBlob(7), 
cstPublicKeyFile(8), 
cstPublicKeyBlob(9), 
cstSSHPublicKeyBlob(10), 
cstP7BFile(11), 
cstP7BBlob(12), 
cstSSHPublicKeyFile(13), 
cstPPKFile(14), 
cstPPKBlob(15), 
cstXMLFile(16), 
cstXMLBlob(17), 
cstJWKFile(18), 
cstJWKBlob(19), 
cstSecurityKey(20), 
cstBCFKSFile(21), 
cstBCFKSBlob(22), 
cstPKCS11(23), 
cstAuto(99)

Default Value

0

Remarks

This is the type of certificate store for this certificate.

The control supports both public and private keys in a variety of formats. When the cstAuto value is used, the control will automatically determine the type. This property can take one of the following values:

Data Type

Integer

SSLCertSubject Property (AzureRelayReceiver Control)

This is the subject of the certificate used for client authentication.

Syntax

azurerelayreceivercontrol.SSLCertSubject[=string]

Default Value

""

Remarks

This is the subject of the certificate used for client authentication.

This property must be set after all other certificate properties are set. When this property is set, a search is performed in the current certificate store to locate a certificate with a matching subject.

If a matching certificate is found, the property is set to the full subject of the matching certificate.

If an exact match is not found, the store is searched for subjects containing the value of the property.

If a match is still not found, the property is set to an empty string, and no certificate is selected.

The special value "*" picks a random certificate in the certificate store.

The certificate subject is a comma-separated list of distinguished name fields and values. For instance, "CN=www.server.com, OU=test, C=US, E=support@nsoftware.com". Common fields and their meanings are as follows:

If a field value contains a comma, it must be quoted.

Data Type

String

SSLProvider Property (AzureRelayReceiver Control)

This specifies the SSL/TLS implementation to use.

Syntax

azurerelayreceivercontrol.SSLProvider[=integer]

Possible Values

sslpAutomatic(0), 
sslpPlatform(1), 
sslpInternal(2)

Default Value

0

Remarks

This property specifies the SSL/TLS implementation to use. In most cases the default value of 0 (Automatic) is recommended and should not be changed. When set to 0 (Automatic) the control will select whether to use the platform implementation or the internal implementation depending on the operating system as well as the TLS version being used.

Possible values are:

In most cases using the default value (Automatic) is recommended. The control will select a provider depending on the current platform.

When Automatic is selected the platform implementation is used by default. When TLS 1.3 is enabled via SSLEnabledProtocols the internal implementation is used.

Data Type

Integer

SSLServerCertEncoded Property (AzureRelayReceiver Control)

This is the certificate (PEM/Base64 encoded).

Syntax

azurerelayreceivercontrol.SSLServerCertEncoded

Default Value

""

Remarks

This is the certificate (PEM/Base64 encoded). This property is used to assign a specific certificate. The SSLServerCertStore and SSLServerCertSubject properties also may be used to specify a certificate.

When SSLServerCertEncoded is set, a search is initiated in the current SSLServerCertStore for the private key of the certificate. If the key is found, SSLServerCertSubject is updated to reflect the full subject of the selected certificate; otherwise, SSLServerCertSubject is set to an empty string.

To read or write binary data to the property, a Variant (Byte Array) version is provided in .SSLServerCertEncodedB.

This property is read-only and not available at design time.

Data Type

Binary String

Config Method (AzureRelayReceiver Control)

Sets or retrieves a configuration setting.

Syntax

azurerelayreceivercontrol.Config ConfigurationString

Remarks

Config is a generic method available in every control. It is used to set and retrieve configuration settings for the control.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the control, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

Disconnect Method (AzureRelayReceiver Control)

This method disconnects the specified client.

Syntax

azurerelayreceivercontrol.Disconnect ConnectionId

Remarks

Calling this method will disconnect the client specified by the ConnectionId parameter.

DoEvents Method (AzureRelayReceiver Control)

Processes events from the internal message queue.

Syntax

azurerelayreceivercontrol.DoEvents 

Remarks

When DoEvents is called, the control processes any available events. If no events are available, it waits for a preset period of time, and then returns.

Interrupt Method (AzureRelayReceiver Control)

Interrupts a synchronous send to the remote host.

Syntax

azurerelayreceivercontrol.Interrupt ConnectionId

Remarks

This property is called using the Connection ID if you wish to interrupt a connection and stop a file from uploading without disconnecting the client connected to the control. If you use SendFile to upload a file, the control will run synchronously on that Connection ID until it is completed.

PauseData Method (AzureRelayReceiver Control)

This method pauses data reception.

Syntax

azurerelayreceivercontrol.PauseData ConnectionId

Remarks

This method pauses data reception for the connection identified by ConnectionId when called. While data reception is paused, the DataIn event will not fire for the specified connection. Call ProcessData to reenable data reception.

ProcessData Method (AzureRelayReceiver Control)

This method reenables data reception after a call to PauseData .

Syntax

azurerelayreceivercontrol.ProcessData ConnectionId

Remarks

This method reenables data reception for the connection identified by ConnectionId after a previous call to PauseData. When PauseData is called, the DataIn event will not fire for the specified connection. To reenable data reception and allow DataIn to fire, call this method.

Note: This method is used only after previously calling PauseData. It does not need to be called to process incoming data by default.

Send Method (AzureRelayReceiver Control)

Sends binary data to the client.

Syntax

azurerelayreceivercontrol.Send ConnectionId, Data

Remarks

This method sends the binary data specified by Data to the client specified by ConnectionId.

SendBytes Method (AzureRelayReceiver Control)

This method sends binary data to the specified client.

Syntax

azurerelayreceivercontrol.SendBytes ConnectionId, Data

Remarks

This method sends binary data to the client identified by ConnectionId. To send text, use the SendText method instead.

When AzureRelayConnectionTimeout is set to 0, the control will behave asynchronously. If you are sending data to the remote host faster than it can process it, or faster than the network's bandwidth allows, the outgoing queue might fill up. When this happens, the operation fails with error 25036: "[10035] Operation would block" (WSAEWOULDBLOCK). You can trap this error, and then try to send the data again. . The BytesSent property shows how many bytes were sent (if any). If 0 bytes were sent, then you can wait for the ReadyToSend event before attempting to send data again.

Note: The ReadyToSend event is not fired when part of the data is sent successfully.

SendFile Method (AzureRelayReceiver Control)

This method sends the file to the remote host.

Syntax

azurerelayreceivercontrol.SendFile ConnectionId, FileName

Remarks

This method sends the file to the client specified by the ConnectionId.

SendHTTPResponse Method (AzureRelayReceiver Control)

Send the HTTP response.

Syntax

azurerelayreceivercontrol.SendHTTPResponse ConnectionId, StatusCode, StatusDescription, ResponseData

Remarks

This method sends an HTTP response to the HTTP request identified by ConnectionId.

The response status code and description, as well as the response body, are sent to the client using this method. The ConnectionId value should be obtained from the HTTPRequest event.

StatusCode is the three digit HTTP status code to return, for instance 200.

StatusDescription is the text corresponding to the StatusCode. For instance OK.

ResponseBody specifies the body to be sent back to the client (if any).

Code Example (HTTP)

Azurerelaylistener listener = new Azurerelaylistener(); listener.AccessKey = "9oKRDwjl0s440MlLUi4qHxDL34j1FS6K3t5TRoJ216c="; listener.AccessKeyName = "RootManageSharedAccessKey"; listener.NamespaceAddress = "myrelay.servicebus.windows.net"; listener.HybridConnection = "hc1"; listener.OnHTTPRequest += (s, e) => { Console.WriteLine("HTTP Request from " + e.RemoteAddress + ":" + e.RemotePort); Console.WriteLine("HTTP Method: " + e.RequestMethod); Console.WriteLine("HTTP Request: " + e.RequestData); myConnectionId = e.ConnectionId; }; //Send a response using the ConnectionId value from the HTTPRequest event listener.SendHTTPResponse(myConnectionId, 200, "OK", myResponseBody);

SendText Method (AzureRelayReceiver Control)

Sends text data to the client.

Syntax

azurerelayreceivercontrol.SendText ConnectionId, Text

Remarks

This method sends text to the client identified by ConnectionId. To send binary data, use the SendBytes method instead.

When AzureRelayConnectionTimeout is set to 0, the control will behave asynchronously. If you are sending data to the remote host faster than it can process it, or faster than the network's bandwidth allows, the outgoing queue might fill up. When this happens, the operation fails with error 25036: "[10035] Operation would block" (WSAEWOULDBLOCK). You can trap this error, and then try to send the data again. . The BytesSent property shows how many bytes were sent (if any). If 0 bytes were sent, then you can wait for the ReadyToSend event before attempting to send data again.

Note: The ReadyToSend event is not fired when part of the data is sent successfully.

This method sends text to the client identified by ConnectionId. Data sent with this method will always be treated as text data regardless of the value of AzureRelayConnectionDataFormat. The control will UTF-8 encode the supplied text.

Shutdown Method (AzureRelayReceiver Control)

This method shuts down the server.

Syntax

azurerelayreceivercontrol.Shutdown 

Remarks

This method shuts down the server. Calling this method is equivalent to calling StopListening and then breaking every client connection by calling Disconnect.

StartListening Method (AzureRelayReceiver Control)

Starts listening for incoming connections.

Syntax

azurerelayreceivercontrol.StartListening 

Remarks

This method begins listening for incoming connections on the port specified by LocalPort. Once listening events will fire as new clients connect and data is transferred.

To stop listening for new connections call StopListening. To stop listening for new connections and disconnect all existing clients call Shutdown.

The following properties are applicable when calling this method:

• AccessKey (required)
• AccessKeyName (required)
• HybridConnection (required)
• NamespaceAddress (required)
• DefaultTimeout
• ForwardingHost
• ForwardingPort

StopListening Method (AzureRelayReceiver Control)

This method stops listening for new connections.

Syntax

azurerelayreceivercontrol.StopListening 

Remarks

This method stops listening for new connections. After being called, any new connection attempts will be rejected. Calling this method does not disconnect existing connections.

To stop listening and to disconnect all existing clients, call Shutdown instead.

Connected Event (AzureRelayReceiver Control)

Fired immediately after the WebSocket handshake completes (or fails).

Syntax

Sub azurerelayreceivercontrol_Connected(StatusCode As Integer, Description As String)

Remarks

The Connected event will fire after the entire WebSocket connection and handshake process finishes (of fails). This consists of 3 steps: the initial TCP connection (along with SSL negotiation, if used), the HTTP "Upgrade" request, and the 101 HTTP response.

If the connection is made normally, StatusCode is 0 and Description is "OK".

If the connection fails, StatusCode has the error code returned by the TCP/IP stack. Description contains a description of this code. The value of StatusCode is equal to the value of the error. The corresponding Visual Basic error code can be obtained by adding 15001 to this value.

Please refer to the Error Codes section for more information.

ConnectionConnected Event (AzureRelayReceiver Control)

Fired when a client has connected.

Syntax

Sub azurerelayreceivercontrol_ConnectionConnected(ConnectionId As Integer)

Remarks

This event fires when a client has successfully established a WebSocket connection.

ConnectionId identifies the connection.

ConnectionDataIn Event (AzureRelayReceiver Control)

Fired when data is received.

Syntax

Sub azurerelayreceivercontrol_ConnectionDataIn(ConnectionId As Integer, DataFormat As Integer, Text As String, EOM As Boolean)

Remarks

The DataIn event provides the data received from the client identified by the ConnectionId parameter.

The incoming data is provided through the Text parameter.

The DataFormat parameter identifies the encoding (if any) of the data. Possible value are:

The EOM parameter stands for End Of Message. By default the control will fire the DataIn event as data is received. Larger messages will be fragmented and will cause the event to fire multiple times. When EOM is true within the event this indicates the current fragment is also the final fragment of the message. The control may also be configured to buffer the message internally until the complete message is received. To enable this set BufferMessage to true.

The EOL parameter stands for End of Line. When LineMode is false, EOL will always be false. When LineMode is true, EOL will be True if the DataIn event fired because an EOL was received, and false if the DataIn event fired because MaxLineLength was reached.

ConnectionDisconnected Event (AzureRelayReceiver Control)

Fired when a WebSocket connection is disconnected.

Syntax

Sub azurerelayreceivercontrol_ConnectionDisconnected(ConnectionId As Integer, StatusCode As Integer, Description As String)

Remarks

When the connection is closed the StatusCode parameter may be used to determine if the disconnect occurred normally or if there was an error condition. If the connection is closed normally the StatusCode will be 1000. The Description parameter will contain a textual description returned by the server. Common StatusCode values are:

ConnectionError Event (AzureRelayReceiver Control)

Information about errors during data delivery.

Syntax

Sub azurerelayreceivercontrol_ConnectionError(ConnectionId As Integer, ErrorCode As Integer, Description As String)

Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the control fails with an error.

ConnectionId contains an error code and Description contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

ErrorCode contains an error code and Description contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

ConnectionReadyToSend Event (AzureRelayReceiver Control)

Fired when the control is ready to send data.

Syntax

Sub azurerelayreceivercontrol_ConnectionReadyToSend(ConnectionId As Integer)

Remarks

The ReadyToSend event indicates that the underlying TCP/IP subsystem is ready to accept data after a failed DataToSend. The event is also fired immediately after a connection is established.

ConnectionRequest Event (AzureRelayReceiver Control)

Fires when a WebSocket connection is requested.

Syntax

Sub azurerelayreceivercontrol_ConnectionRequest(Accept As Boolean, RendezvousAddress As String, Id As String, ConnectHeaders As String, SubProtocols As String, Extensions As String, Host As String, RemoteAddress As String, RemotePort As Integer, StatusCode As Integer, StatusDescription As String)

Remarks

This event fires when a client requests a connection. The parameters of this event may be used to determine whether to accept or reject the connection.

To accept a connection set Accept to True (default). To reject a connection set Accept to False and set StatusCode and StatusDescription.

Accept defines whether the connection request is accepted or rejected. The default value is True. Set this to False to reject the connection.

RendezvousAddress holds the rendezvous URL to which the connection specific websocket connection will be made. This is informational only.

Id holds the Id of the connection. If an Id was specified by the client it is present here, otherwise the Azure Relay Service generates a value. For instance: b3ac97ea-d0f0-4286-bf1d-d493a4a22c27_G23_G22.

ConnectHeaders contains a JSON object with the HTTP headers that have been supplied by the sender to the Azure Relay service. For instance:

"connectHeaders": {
	"Sec-WebSocket-Key": "wIdDlRBg\/J\/Hx12q6iFdUQ==",
	"Sec-WebSocket-Version": "13",
	"Origin": "null",
	"Connection": "Upgrade",
	"Upgrade": "websocket",
	"Accept-Encoding": "gzip, deflate",
	"Host": "nstest.servicebus.windows.net",
	"User-Agent": "IPWorks HTTP Component - www.nsoftware.com"
}

SubProtocols holds the subprotocols (application-level protocols layered over the WebSocket Protocol) sent by the client in the initial WebSocket connection request.

Extensions holds the WebSocket extensions sent by the client in the initial WebSocket connection request.

Host is the Host header value of the connected client.

RemoteAddress is the IP address of the connecting client.

RemotePort is the port used by the connecting client.

StatusCode is a 3 digit HTTP status code used when Accept is set to False. Set this to any 3 digit HTTP status code when rejecting a connection. For instance: 404.

StatusDescription should be set to the text description corresponding to the StatusCode value when rejecting a connection. For instance: Not Found.

ConnectionStatus Event (AzureRelayReceiver Control)

Fired to indicate changes in connection state.

Syntax

Sub azurerelayreceivercontrol_ConnectionStatus(ConnectionEvent As String, StatusCode As Integer, Description As String)

Remarks

The ConnectionStatus event is fired when the connection state changes: completion of a firewall or proxy connection, completion of a security handshake, etc.

The ConnectionEvent parameter indicates the type of connection event. Values may include:

Disconnected Event (AzureRelayReceiver Control)

This event is fired when a connection is closed.

Syntax

Sub azurerelayreceivercontrol_Disconnected(StatusCode As Integer, Description As String)

Remarks

If the connection is broken normally, StatusCode is 0 and Description is "OK".

If the connection is broken for any other reason, StatusCode has the error code returned by the Transmission Control Protocol (TCP/IP) subsystem. Description contains a description of this code. The value of StatusCode is equal to the value of the TCP/IP error. The corresponding Visual Basic error code can be obtained by adding 15001 to this value.

Please refer to the Error Codes section for more information.

Error Event (AzureRelayReceiver Control)

Fired when information is available about errors during data delivery.

Syntax

Sub azurerelayreceivercontrol_Error(ErrorCode As Integer, Description As String)

Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the control fails with an error.

The ErrorCode parameter contains an error code, and the Description parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

Header Event (AzureRelayReceiver Control)

This event is fired every time a header line comes in.

Syntax

Sub azurerelayreceivercontrol_Header(Field As String, Value As String)

Remarks

The Field parameter contains the name of the HTTP header (which is the same as it is delivered). The Value parameter contains the header contents.

If the header line being retrieved is a continuation header line, then the Field parameter contains "" (empty string).

HTTPRequest Event (AzureRelayReceiver Control)

Fires when an HTTP request is received.

Syntax

Sub azurerelayreceivercontrol_HTTPRequest(ConnectionId As Integer, RendezvousAddress As String, Id As String, RequestHeaders As String, RequestTarget As String, RequestMethod As String, Host As String, RemoteAddress As String, RemotePort As Integer, RequestData As String)

Remarks

This event fires when an HTTP request is received. The parameters of this event describe the details of the HTTP request.

The ConnectionId value must be saved and used when calling SendHTTPResponse.

Parameter Descriptions

ConnectionId contains an identifier generated by the control to identify each connection. This identifier is unique to this connection.

RendezvousAddress holds the rendezvous URL to which the connection specific websocket connection may be made. This is for information only, no action needs to be taken based on this value. For instance: wss://g2-prod-by3-003-sb.servicebus.windows.net/$hc/hc1?sb-hc-action=request&sb-hc-id=e1df5efe-0988-450c-9512-f9f1d91b39a0_G2

Id holds the Id of the connection. If an Id was specified by the client it is present here, otherwise the Azure Relay service generates a value. For instance: 2d4acb89-7d15-4aeb-bcd5-66e031580a90_G21_G1.

RequestHeaders contains a JSON object containing the HTTP headers supplied to the Azure Relay service by the sender. Note that authorization values used to authenticate to the Azure Relay service, as well as all headers defined in RFC 7230 with the exception of Via are also stripped. For instance headers such as Content-Length are stripped by the relay and are not present in this value. For instance:

"requestHeaders": {
	"Accept-Encoding": "gzip, deflate",
	"Host": "nstest.servicebus.windows.net",
	"User-Agent": "IPWorks HTTP Component - www.nsoftware.com",
	"Via": "1.1 nstest.servicebus.windows.net"
}

RequestTarget is the request target including query string params, as defined in RFC 7230 section 5.3. For instance /hc1.

RequestMethod contains HTTP method sent in the request. For instance POST or GET.

Hostholds the Host header value of the connected client.

RemoteHost contains the IP address of the remote host that initiated the HTTP request (the client).

RemotePort contains the port used by the remote host to establish the connection.

RequestData holds the body of the HTTP request (if any).

Log Event (AzureRelayReceiver Control)

Fires once for each log message.

Syntax

Sub azurerelayreceivercontrol_Log(ConnectionId As Integer, LogLevel As Integer, Message As String, LogType As String)

Remarks

This event fires once for each log message generated by the control. The verbosity is controlled by the LogLevel setting.

LogLevel indicates the level of message. Possible values are:

The value 1 (Info) logs basic information including the URL, HTTP version, and connection status details.

The value 2 (Verbose) logs additional information about the initial HTTP request.

The value 3 (Debug) logs additional debug information (if available).

Message is the log entry.

LogType identifies the type of log entry. Possible values are:

• "Info"
• "Error"
• "Verbose"
• "Debug"

Redirect Event (AzureRelayReceiver Control)

This event is fired when a redirection is received from the server.

Syntax

Sub azurerelayreceivercontrol_Redirect(Location As String, Accept As Boolean)

Remarks

This event is fired in cases in which the client can decide whether or not to continue with the redirection process. The Accept parameter is always True by default, but if you do not want to follow the redirection, Accept may be set to False, in which case the control fails with an error. Location is the location to which the client is being redirected. Further control over redirection is provided in the FollowRedirects property.

SSLServerAuthentication Event (AzureRelayReceiver Control)

Fired after the server presents its certificate to the client.

Syntax

Sub azurerelayreceivercontrol_SSLServerAuthentication(CertEncoded As String, CertSubject As String, CertIssuer As String, Status As String, Accept As Boolean)

Remarks

During this event, the client can decide whether or not to continue with the connection process. The Accept parameter is a recommendation on whether to continue or close the connection. This is just a suggestion: application software must use its own logic to determine whether or not to continue.

When Accept is False, Status shows why the verification failed (otherwise, Status contains the string OK). If it is decided to continue, you can override and accept the certificate by setting the Accept parameter to True.

SSLStatus Event (AzureRelayReceiver Control)

Fired when secure connection progress messages are available.

Syntax

Sub azurerelayreceivercontrol_SSLStatus(Message As String)

Remarks

The event is fired for informational and logging purposes only. This event tracks the progress of the connection.

Config Settings (AzureRelayReceiver Control)

AzureRelayReceiver Config Settings

WebSocketServer Config Settings

TCPServer Config Settings

SSL Config Settings

-----BEGIN CERTIFICATE-----
MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw
...
eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w
F0I1XhM+pKj7FjDr+XNj
-----END CERTIFICATE-----
\r \n
-----BEGIN CERTIFICATE-----
MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp
..
d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA
-----END CERTIFICATE-----

-----BEGIN CERTIFICATE-----
MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw
...
eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w
F0I1XhM+pKj7FjDr+XNj
-----END CERTIFICATE-----
\r \n
-----BEGIN CERTIFICATE-----
MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp
..
d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA
-----END CERTIFICATE-----

Trappable Errors (AzureRelayReceiver Control)

WebSocketServer Errors

TCPServer Errors

SSL Errors

TCP/IP Errors