如何使Python的urllib2遵循重定向并保持post方法 [英] How to make python urllib2 follow redirect and keep post method

问题描述

我使用的urllib2将数据发布到表单。问题是，在形式与302重定向应答。据 Python的HTT predirectHandler 重定向处理器将采取请求，并将其从POST转换成GET，并按照301或302，我想preserve POST方法，并传递到揭幕战中的数据。我通过简单地增加数据= req.get_data（）到新的要求而作出的自定义HTT predirectHandler不成功的尝试。

我相信之前，所以我想我会做一个职位这项工作已经完成。

请注意：这类似于<一个href=\"http://stackoverflow.com/questions/554446/how-do-i-$p$pvent-pythons-urllib2-from-following-a-redirect\">this帖子和<一个href=\"http://stackoverflow.com/questions/110498/is-there-an-easy-way-to-request-a-url-in-python-and-not-follow-redirects/110808\">this 之一，但我不想prevent重定向我只是想继续POST数据。

下面是我的HTT predirectHandler不起作用

 类MyHTT predirectHandler（urllib2.HTT predirectHandler）：
高清redirect_request（个体经营，REQ，FP，code，味精，头，NEWURL）：
    响应重定向返回请求或无。    这是由http_error_30x方法调用时
    重定向响应被接收。如果应该重定向
    发生，返回一个新的请求，允许http_error_30x到
    执行重定向。否则，引发HTTPError如果没有人
    否则应尽量处理这个网址。返回None如果你不能
    但另一个处理程序可能。
    
    M = req.get_method（）
    如果（code在（301，302，303，307）和M（GET，HEAD）
        或code在（301，302，303）和m ==POST）：
        ＃严格（根据RFC 2616），301或302响应
        ＃一个POST不得造成无确认重定向
        ＃来自用户（urllib2的的，在这种情况下）。在实践中，
        ＃基本上所有的客户都在这种情况下重定向，所以我们
        ＃ 照着做。
        ＃包含空格的URI conciliant
        NEWURL = newurl.replace（''，'％20'）
        返回请求（NEWURL，
                       标题= req.headers，
                       数据= req.get_data（）
                       origin_req_host = req.get_origin_req_host（），
                       不能证实= TRUE）
    其他：
        引发HTTPError（req.get_full_url（），code，味精，头，FP）
 

解决方案

这实际上是一个非常糟糕的事情我想过这个问题就越多。举例来说，如果我提交表单
http://example.com/add （用POST数据增加一个项）
和响应是一个302重定向到 http://example.com/add 以及我张贴我贴我第一次相同的数据将无限循环告终。不知道为什么我之前没有想到这一点。我将离开这里的问题只是作为一个警告，任何人想这样做。

I am using urllib2 to post data to a form. The problem is that the form replies with a 302 redirect. According to Python HTTPRedirectHandler the redirect handler will take the request and convert it from POST to GET and follow the 301 or 302. I would like to preserve the POST method and the data passed to the opener. I made an unsuccessful attempt at a custom HTTPRedirectHandler by simply adding data=req.get_data() to the new Request.

I am sure this has been done before so I thought I would make a post.

Note: this is similar to this post and this one but I don't want to prevent the redirect I just want to keep the POST data.

Here is my HTTPRedirectHandler that does not 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)

解决方案

This is actually a really bad thing to do the more I thought about it. For instance, if I submit a form to http://example.com/add (with post data to add a item) and the response is a 302 redirect to http://example.com/add and I post the same data that I posted the first time I will end up in an infinite loop. Not sure why I didn't think of this before. I'll leave the question here just as a warning to anyone else thinking about doing this.

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