add_header Method
Adds a custom header to send with outgoing messages.
Syntax
def add_header(key: str, value: str) -> None: ...
Remarks
This method is used to add user-defined headers to the list of headers held by the Header* properties.
When send_message or send_data is called, all headers in the Header* properties are added to the outgoing message.
Note that the STOMP specification defines a number of standard headers necessary for implementing the STOMP protocol. When constructing an outgoing message, the class silently ignores any user-defined headers that are already set by the class.