我使用 BaseHTTPRequestHandler 制作了简单的 HTTP 服务器。问题是，当我想使用来自客户端的请求发布一些数据时，我得到了 ConnectionError。我从 requests lib 文档中做了简单的请求。同样有趣的是，HTTP 服务器将从客户端接收数据并将其打印到控制台。我不明白这怎么可能。

客户:

def post_data():
    """Client method"""
    json_data = {
        'sender': 'User',
        'receiver': 'MY_SERVER',
        'message': 'Hello server! Sending some data.'}
    data_headers = {'Content-type': 'application/json', 'Accept': 'text/plain'}
    data_payload = json.dumps(json_data)

    try:
        post = requests.post('http://localhost:8080/post', data=data_payload,
                             headers=data_headers)
        print(post.status_code)
    except ConnectionError as e:
        print("CONNECTION ERROR: ")
        print(e)

HTTP 服务器:

def do_POST(self):
    """Server method"""
    self.send_response(200)
    print("Receiving new data ...")
    content_length = int(self.headers['Content-Length'])
    post_data = self.rfile.read(content_length)
    print(post_data)

服务器结果:

C:\Users\mypc\Projects\PythonFiles\httpserver>python server.py

Fri Jan  5 01:09:12 2018: HTTP Server started on port 8080.
127.0.0.1 - - [05/Jan/2018 01:09:21] "POST /post HTTP/1.1" 200 -
Receiving new data ...
b'{"sender": "User", "receiver": "MY_SERVER", "message": "Hello server! Sending some data."}'

客户端结果:

C:\Users\mypc\Projects\PythonFiles\httpserver>python client.py
CONNECTION ERROR:
('Connection aborted.', RemoteDisconnected('Remote end closed connection without response',))

C:\Users\mypc\Projects\PythonFiles\httpserver>

没有异常 block 的错误:

Traceback (most recent call last):
  File "C:\Python36\lib\site-packages\urllib3\connectionpool.py", line 601, in urlopen
    chunked=chunked)
  File "C:\Python36\lib\site-packages\urllib3\connectionpool.py", line 387, in _make_request
    six.raise_from(e, None)
  File "<string>", line 2, in raise_from
  File "C:\Python36\lib\site-packages\urllib3\connectionpool.py", line 383, in _make_request
    httplib_response = conn.getresponse()
  File "C:\Python36\lib\http\client.py", line 1331, in getresponse
    response.begin()
  File "C:\Python36\lib\http\client.py", line 297, in begin
    version, status, reason = self._read_status()
  File "C:\Python36\lib\http\client.py", line 266, in _read_status
    raise RemoteDisconnected("Remote end closed connection without"
http.client.RemoteDisconnected: Remote end closed connection without response

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Python36\lib\site-packages\requests\adapters.py", line 440, in send
    timeout=timeout
  File "C:\Python36\lib\site-packages\urllib3\connectionpool.py", line 639, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "C:\Python36\lib\site-packages\urllib3\util\retry.py", line 357, in increment
    raise six.reraise(type(error), error, _stacktrace)
  File "C:\Python36\lib\site-packages\urllib3\packages\six.py", line 685, in reraise
    raise value.with_traceback(tb)
  File "C:\Python36\lib\site-packages\urllib3\connectionpool.py", line 601, in urlopen
    chunked=chunked)
  File "C:\Python36\lib\site-packages\urllib3\connectionpool.py", line 387, in _make_request
    six.raise_from(e, None)
  File "<string>", line 2, in raise_from
  File "C:\Python36\lib\site-packages\urllib3\connectionpool.py", line 383, in _make_request
    httplib_response = conn.getresponse()
  File "C:\Python36\lib\http\client.py", line 1331, in getresponse
    response.begin()
  File "C:\Python36\lib\http\client.py", line 297, in begin
    version, status, reason = self._read_status()
  File "C:\Python36\lib\http\client.py", line 266, in _read_status
    raise RemoteDisconnected("Remote end closed connection without"
urllib3.exceptions.ProtocolError: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response',))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "client.py", line 137, in <module>
    start_parser()
  File "client.py", line 101, in start_parser
    send_requests(args.get, args.post)
  File "client.py", line 51, in send_requests
    post_data()
  File "client.py", line 129, in post_data
    headers=data_headers)
  File "C:\Python36\lib\site-packages\requests\api.py", line 112, in post
    return request('post', url, data=data, json=json, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 508, in request
    resp = self.send(prep, **send_kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 618, in send
    r = adapter.send(request, **kwargs)
  File "C:\Python36\lib\site-packages\requests\adapters.py", line 490, in send
    raise ConnectionError(err, request=request)
requests.exceptions.ConnectionError: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response',))

最佳答案

看起来服务器在没有发送完整响应的情况下提前终止了连接。我浏览了文档，我认为这是问题所在(强调):

send_response(code, message=None) 

Adds a response header to the headers buffer and logs the accepted request. The HTTP response line is written to the internal buffer, followed by Server and Date headers. The values for these two headers are picked up from the version_string() and date_time_string() methods, respectively. If the server does not intend to send any other headers using the send_header() method, then send_response() should be followed by an end_headers() call.

Changed in version 3.3: Headers are stored to an internal buffer and end_headers() needs to be called explicitly.

所以您可能只需要添加对 end_headers 的调用。如果您正在阅读一个旧示例(Python 3.3 之前)，则不需要这样做。

关于Python HTTP 服务器/客户端 : Remote end closed connection without response error，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48105448/