Python 请求从 POST 中删除 Content-Length 标头 [英] Python requests remove the Content-Length header from POST

问题描述

我正在使用 python requests 模块对网站进行一些测试.

I'm using the python requests module to do some testing against a site.

requests 模块允许您通过传入一个键设置为 None 的字典来删除某些标头.例如

The requests module allows you to remove certain headers by passing in a dictionary with the keys set to None. For example

headers = {u'User-Agent': None}

将确保没有用户代理随请求一起发送.

will ensure that no user agent is sent with the request.

但是，似乎当我发布数据时，即使我指定了 None 或不正确的值，请求也会为我计算正确的 Content-Length.例如.

However, it seems that when I post data, requests will calculate the correct Content-Length for me even if I specify None, or an incorrect value. Eg.

headers = {u'Content-Length': u'999'}
headers = {u'Content-Length': None}

我检查了请求中使用的标头的响应 (response.request.headers)，我可以看到 Content-Length 已使用正确的值重新添加.到目前为止，我看不到任何方法可以禁用此行为

I check the response for the headers used in the request (response.request.headers) and I can see the Content-Length has been re-added with the correct value. So Far I cannot see any way to disable this behaviour

CaseInsensitiveDict({'Content-Length': '39', 'Content-Type': 'application/x-www-form-urlencoded', 'Accept-Encoding': 'gzip, deflate, compress', 'Accept': '*/*', 'User-Agent': 'python-requests/2.2.1 CPython/2.7.6 Linux/3.13.0-36-generic'})

我真的很想继续使用请求模块来做到这一点.这可能吗?

I'd REALLY like to remain with the requests module to do this. Is this possible?

推荐答案

你必须手动准备请求，然后移除生成的 content-length 头:

You'll have to prepare the request manually, then remove the generated content-length header:

from requests import Request, Session

s = Session()
req = Request('POST', url, data=data)
prepped = req.prepare()
del prepped.headers['content-length']
response = s.send(prepped)

请注意，大多数合规的 HTTP 服务器可能会忽略您的帖子正文！

Do note that most compliant HTTP servers may then ignore your post body!

如果您打算使用分块传输编码(您不必发送内容长度)，然后对 data 参数使用迭代器.请参阅分块编码请求 在文档中.在这种情况下不会设置 Content-Length 标头.

If you meant to use chunked transfer encoding (where you don't have to send a content length), then use a iterator for the data parameter. See Chunked-Encoded Requests in the documentation. No Content-Length header will be set in that case.

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