由于 v1.2.3 Requests 添加了
PreparedRequest 对象。根据文档“它包含将发送到服务器的确切字节”。

可以使用它来漂亮地打印请求，如下所示：

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):
    """
    At this point it is completely built and ready
    to be fired; it is "prepared".

    However pay attention at the formatting used in 
    this function because it is programmed to be pretty 
    printed and may differ from the actual request.
    """
    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)

产生：

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

a=1&b=2

然后你可以用这个发送实际的请求：

s = requests.Session()
s.send(prepared)

这些链接指向可用的最新文档，因此它们的内容可能会发生变化： 高级 - 准备好的请求和API - 较低级别的类