How to Preview Raw HTTP Requests in Python Using Requests\' PreparedRequest?

Printing Raw HTTP Requests in Python with Requests

When working with the Requests module, you may encounter situations where it's beneficial to inspect the raw HTTP request being sent to the server. This includes not only the headers but also the request line and content.

Solution using PreparedRequest:

From version 1.2.3 onwards, Requests introduced the PreparedRequest object. This object represents the "exact bytes that will be sent to the server," as documented here: https://requests.readthedocs.io/en/latest/advanced/prepared-requests-and-api/

To print the raw HTTP request in a pretty format, you can leverage the PreparedRequest object as follows:

<code class="python">import requests

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

def pretty_print_POST(req):
    """
    Formats and prints the prepared request in a readable manner.
    """
    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)

# Output:
-----------START-----------
POST http://stackoverflow.com/
Content-Length: 7
X-Custom: Test

a=1&b=2</code>

This will display the request line, headers, and request body in a visually pleasing format.

Note: The formatting used in the pretty_print_POST function is designed for readability and may differ slightly from the actual request sent.

Once you have inspected the prepared request, you can proceed to send the actual request using the Requests Session as follows:

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

For more detailed information on advanced features such as Prepared Requests and API, refer to the Requests documentation: https://requests.readthedocs.io/en/latest/advanced/prepared-requests-and-api/

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