PostStream Method
Sends a POST request to the server.
procedure PostStream(Url: String; InputStream: TStream);
Remarks
POST is used to send data to the remote HTTP endpoint/script.
Provide the data you need to send via the InputStream parameter.
To post a web form data (including file attachments to the form) use PostWebForm method.
Note that any parameters you intend to pass to this method should be properly encoded before this method is called.