How to Capture and Print Raw HTTP Requests Using Python?

Printing Raw HTTP Requests in Python Using Requests

When using the Requests module, you may encounter a need to examine the entire raw HTTP request, including the request line, headers, and message body. This guide explores a technique to capture and print the complete raw HTTP request.

The recent addition of the PreparedRequest object in Requests (v1.2.3 ) provides a means to do just that. The PreparedRequest object represents the HTTP request that will be sent to the server, providing access to its exact bytes.

To pretty-print the request, we can leverage the following Python code:

<code class="python">import requests

req = requests.Request('POST','http://stackoverflow.com',headers={'X-Custom':'Test'},data='a=1&amp;b=2')
prepared = req.prepare()

def pretty_print_POST(req):
    """
    Pretty-print the prepared request.

    Note: The formatting used here may differ from the actual request.
    """
    print('{}\n{}\r\n{}\r\n\r\n{}'.format(
        '-----------START-----------',
        req.method + ' ' + req.url,
        '\r\n'.join('{}: {}'.format(k, v) for k, v in req.headers.items()),
        req.body,
    ))

pretty_print_POST(prepared)</code>

This code effectively captures the entire prepared request, including the request line, headers, and body, and presents it in a visually appealing format. The prepared request can then be sent to the server using the following code:

<code class="python">s = requests.Session()
s.send(prepared)</code>

By using the PreparedRequest object, you gain the ability to thoroughly inspect and print the raw HTTP request before sending it to the server. This can be particularly useful for debugging and understanding the intricate details of HTTP requests.

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