Wrong Content-Length if request contains a body

[cyrusste]

Description

Restler gives a wrong Content-Length if the request contains a body.

Related codes can be seen: https://github.com/microsoft/restler-fuzzer/blob/main/restler/engine/transport_layer/messaging.py, line 192.

        if "Content-Length: " not in message:
            try:
                contentlen = len(message[_get_start_of_body(message):])
                message = _append_to_header(message, f"Content-Length: {contentlen}")

        def _get_end_of_header(message):
            return message.index(DELIM)

        def _get_start_of_body(message):
            return _get_end_of_header(message) + len(DELIM)

For example, a request message with payload would be: <...>\r\n\r\n<payload>\r\n

Last 2 chars in message is "\r\n", which should not be counted into Content-Length.

Something like this would sovle the problem..?

start_of_body =_get_start_of_body(message)
if start_of_body == len(message):
  contentlen = 0
else:
  contentlen = len(message[start_of_body:-2])

Steps to reproduce

Just demo_server can reproduce the problem.

PUT "/api/blog/posts/{postId}" has a requestBody. By compiling and testing, and checking network.testing.xxx, you could reproduce the problem.

Expected results

No response

Actual results

No response

Environment details

No response