Connection issue after a HEAD is used

[Dave Johansen]

We noticed that monitoring checks using HEAD were causing ConnectionResetError issues in our logs. We believe that this may be causing issues with some other requests, but haven't been able to verify that yet. However, there's a simple way to reproduce this issue. Simply ​create a new project and run it using the instructions from the tutorial and then run a command like this curl -I http://localhost:8000/ http://localhost:8000/ or run a Python script like this:

import logging

import requests

logging.basicConfig(level=logging.DEBUG)
s = requests.Session()

r = s.head('http://localhost:8000/')
print(r.status_code, r.text)
r = s.head('http://localhost:8000/')
print(r.status_code, r.text)

And you'll notice an output like this:

16/Sep/2021 16:02:17] "HEAD / HTTP/1.1" 200 16348
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 44808)
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/socketserver.py", line 650, in process_request_thread
    self.finish_request(request, client_address)
  File "/usr/local/lib/python3.7/socketserver.py", line 360, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/local/lib/python3.7/socketserver.py", line 720, in __init__
    self.handle()
  File "/usr/local/lib/python3.7/site-packages/django/core/servers/basehttp.py", line 171, in handle
    self.handle_one_request()
  File "/usr/local/lib/python3.7/site-packages/django/core/servers/basehttp.py", line 179, in handle_one_request
    self.raw_requestline = self.rfile.readline(65537)
  File "/usr/local/lib/python3.7/socket.py", line 589, in readinto
    return self._sock.recv_into(b)
ConnectionResetError: [Errno 104] Connection reset by peer
----------------------------------------
[16/Sep/2021 16:02:18] "HEAD / HTTP/1.1" 200 16348

Or with 3.2, an output like this:

[16/Sep/2021 23:31:37] "HEAD / HTTP/1.1" 200 10697
[16/Sep/2021 23:31:37,819] - Broken pipe from ('127.0.0.1', 46600)

[16/Sep/2021 23:31:45] "HEAD / HTTP/1.1" 200 10697

[Mariusz Felisiak]

It's a duplicate of #28054 and #29343, the proposed ​PR fixes this issue for me.