Gregory P. Smith <g...@krypto.org> added the comment:

httplib.py is a Python 2 concept.  Python 2 is end of life.  bugs.python.org no 
longer tracks issues with its code.  I don't doubt that Python 2.7 has bugs.  
As a matter of policy, we don't care - 
https://www.python.org/doc/sunset-python-2/.  Python 3.6 as that is the oldest 
branch still open for security fixes.

The PRs associated with this issue fixed a codepath in Python 3 that only 
happened after a '100' response.  That codepath did not accumulate headers:

```
            if status != CONTINUE:
                break
            # skip the header from the 100 response
            while True:
                skip = self.fp.readline(_MAXLINE + 1)
                if len(skip) > _MAXLINE:
                    raise LineTooLong("header line")
                skip = skip.strip()
                if not skip:
                    break
```

CONTINUE = 100; meaning that loop only runs after receiving what appears to be 
a 100 continue response.  And it does not accumulate data.

There is no `hlist` in the original pre-fix Python 3.6+ code.  Nor any header 
accumulation caused by this the client.py talking to evil_server.py as 
described in this issues opening message.

----------

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44022>
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