How to make python urllib2 follow the migration and save the post method

Question

I am using urllib2 to submit data to a form. The problem is that the form responds with a 302 redirect. According to Python's HTTPRedirectHandler, the redirector will accept the request and convert it from POST to GET and follow 301 or 302. I would like to save the POST method and the data passed to the opener. I made an unsuccessful attempt in a custom HTTPRedirectHandler by simply adding data = req.get_data () to a new request.

I am sure that this was done earlier, so I thought I would make a message.

Note: this is similar to this post and this one , but I do not want to prevent redirection I just want to save the POST data.

Here is my HTTPRedirectHandler that doesn't work

class MyHTTPRedirectHandler(urllib2.HTTPRedirectHandler):
def redirect_request(self, req, fp, code, msg, headers, newurl):
    """Return a Request or None in response to a redirect.

    This is called by the http_error_30x methods when a
    redirection response is received.  If a redirection should
    take place, return a new Request to allow http_error_30x to
    perform the redirect.  Otherwise, raise HTTPError if no-one
    else should try to handle this url.  Return None if you can't
    but another Handler might.
    """
    m = req.get_method()
    if (code in (301, 302, 303, 307) and m in ("GET", "HEAD")
        or code in (301, 302, 303) and m == "POST"):
        # Strictly (according to RFC 2616), 301 or 302 in response
        # to a POST MUST NOT cause a redirection without confirmation
        # from the user (of urllib2, in this case).  In practice,
        # essentially all clients do redirect in this case, so we
        # do the same.
        # be conciliant with URIs containing a space
        newurl = newurl.replace(' ', '%20')
        return Request(newurl,
                       headers=req.headers,
                       data=req.get_data(),
                       origin_req_host=req.get_origin_req_host(),
                       unverifiable=True)
    else:
        raise HTTPError(req.get_full_url(), code, msg, headers, fp)

Answer 1

Actually, it’s really bad to do more than I thought about it. For example, if I submit a form to http://example.com/add (with data to add an object) and the response is redirected to http://example.com/add , and I submit the same data that I posted to The first time I finish in an endless loop, I don’t know why I didn’t think about it before. I will leave this question here as a warning so that someone else thinks about it.