我遇到一个重复的情况，当请求“足够长”时，http 请求无限期挂起（或直到超时）。没有测试阈值是多少，但我的请求大约需要 18 分钟。
我验证了服务器响应并完成了对请求的处理。还netstat验证服务器端没有打开的套接字。
客户端代码：
requests.get(f"http://{ip}/data", params={...}, verify=False, headers={"User-Agent": "Python"})
它挂在以下堆栈上：
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.9/site-packages/requests/api.py", line 76, in get
return request('get', url, params=params, **kwargs)
File "/usr/local/lib/python3.9/site-packages/requests/api.py", line 61, in request
return session.request(method=method, url=url, **kwargs)
File "/usr/local/lib/python3.9/site-packages/requests/sessions.py", line 542, in request
resp = self.send(prep, **send_kwargs)
File "/usr/local/lib/python3.9/site-packages/requests/sessions.py", line 655, in send
r = adapter.send(request, **kwargs)
File "/usr/local/lib/python3.9/site-packages/requests/adapters.py", line 439, in send
resp = conn.urlopen(
File "/usr/local/lib/python3.9/site-packages/urllib3/connectionpool.py", line 699, in urlopen
httplib_response = self._make_request(
File "/usr/local/lib/python3.9/site-packages/urllib3/connectionpool.py", line 445, in _make_request
six.raise_from(e, None)
File "<string>", line 3, in raise_from
File "/usr/local/lib/python3.9/site-packages/urllib3/connectionpool.py", line 440, in _make_request
httplib_response = conn.getresponse()
File "/usr/local/Cellar/python@3.9/3.9.4/Frameworks/Python.framework/Versions/3.9/lib/python3.9/http/client.py", line 1345, in getresponse
response.begin()
File "/usr/local/Cellar/python@3.9/3.9.4/Frameworks/Python.framework/Versions/3.9/lib/python3.9/http/client.py", line 307, in begin
version, status, reason = self._read_status()
File "/usr/local/Cellar/python@3.9/3.9.4/Frameworks/Python.framework/Versions/3.9/lib/python3.9/http/client.py", line 268, in _read_status
line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
File "/usr/local/Cellar/python@3.9/3.9.4/Frameworks/Python.framework/Versions/3.9/lib/python3.9/socket.py", line 704, in readinto
return self._sock.recv_into(b)
也转载自urllib：
>>> urllib.request.urlopen(f"http://{ip}/data").read()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/Cellar/python@3.9/3.9.4/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 214, in urlopen
return opener.open(url, data, timeout)
File "/usr/local/Cellar/python@3.9/3.9.4/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 517, in open
response = self._open(req, data)
File "/usr/local/Cellar/python@3.9/3.9.4/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 534, in _open
result = self._call_chain(self.handle_open, protocol, protocol +
File "/usr/local/Cellar/python@3.9/3.9.4/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 494, in _call_chain
result = func(*args)
File "/usr/local/Cellar/python@3.9/3.9.4/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 1375, in http_open
return self.do_open(http.client.HTTPConnection, req)
File "/usr/local/Cellar/python@3.9/3.9.4/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 1350, in do_open
r = h.getresponse()
File "/usr/local/Cellar/python@3.9/3.9.4/Frameworks/Python.framework/Versions/3.9/lib/python3.9/http/client.py", line 1345, in getresponse
response.begin()
File "/usr/local/Cellar/python@3.9/3.9.4/Frameworks/Python.framework/Versions/3.9/lib/python3.9/http/client.py", line 307, in begin
version, status, reason = self._read_status()
File "/usr/local/Cellar/python@3.9/3.9.4/Frameworks/Python.framework/Versions/3.9/lib/python3.9/http/client.py", line 268, in _read_status
line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
File "/usr/local/Cellar/python@3.9/3.9.4/Frameworks/Python.framework/Versions/3.9/lib/python3.9/socket.py", line 704, in readinto
return self._sock.recv_into(b)
如您所见，这是 python 3.9.4 ，尽管我怀疑它不会在早期版本中重现。
我知道长 http 请求是一种不好的做法，但这不是我关心的问题。