Python连接到HTTP服务器 [英] Python connecting to an HTTP server

问题描述

在我的计划中，我正在尝试访问 https://api.dropbox.com/1/oauth2/token 。为了做到这一点，我试图使用 http.client.HTTPSConnection（）。但是，我收到了来自服务器的400声明，即使我通过浏览器发送相同的请求时，我得到了实际的回复：

In my program, I am trying to access https://api.dropbox.com/1/oauth2/token. In order to do that, I was trying to use http.client.HTTPSConnection(). However, I am receiving a 400 statement from the server, even though when I send the same request through my browser, I get an actual response:

{错误：调用需要以下方法之一：POST，OPTIONS。得到GET。}

我相信这个因为我还测试了 https://docs.python.org/3/ 的功能，结果非常相似。

I believe that this happens for subdomains, since I also tested the function for https://docs.python.org/3/, and the result is very similar.

这是我的代码（Python3）：

Here is my code (Python3):

conn = http.client.HTTPSConnection('docs.python.org')
conn.request('get', '/3/')
response = conn.getresponse().read()
print(response)

我应该如何使用 http.client 库来发送正确的请求？

How should I use the http.client library to send the proper request?

推荐答案

TL; DR：将小写'get'更改为大写'GET'应解决问题。

TL;DR: Change the lowercase 'get' to uppercase 'GET' should resolve the problem.

原因：根据5.1.1节， RFC2616 ：

The reason: according to section 5.1.1, RFC2616:

Method标记表示方法在Request-URI标识的
资源上执行。该方法区分大小写。

The Method token indicates the method to be performed on the resource identified by the Request-URI. The method is case-sensitive.

RFC2616还定义了8种方法，分别是OPTIONS，GET，HEAD， POST，PUT，DELETE，TRACE和CONNECT。所有这些都是大写的。

RFC2616 also defined 8 methods which are "OPTIONS", "GET", "HEAD", "POST", "PUT", "DELETE", "TRACE", and "CONNECT". All of them are uppercase.

我们知道一些HTTP客户端，如 python-requests 和 jQuery.ajax 也支持小写方法，但它们不是RFC为使用这些方法定义的标准方式。为防止出现问题，请先使用大写字母。

We do know some HTTP clients like python-requests and jQuery.ajax also support lowercase methods but they are just not the standard way defined by the RFC for using those methods. To prevent issues, use uppercase ones first.

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