[issue8704] cgitb sends a bogus HTTP header if the app crashes before finishing headers

[Артур Клесун]

Артур Клесун added the comment:

Apache started strict check of headers ch
aracters to be valid recently. That causes it fail on "<--: spam".

```
[Sat May 20 13:09:23.056673 2017] [http:error] [pid 26379] [client 12.34.567.41:60988] AH02429: Response header name '<!--' contains invalid characters, aborting request, referer: http://example.com/
```

http://apache-http-server.18135.x6.nabble.com/Bug-60863-New-Apache-proxy-2-4-25-can-disable-header-check-Set-Cookie-td5036120.html

The workaround is to put:
HttpProtocolOptions Unsafe
line into your apache .conf

----------
nosy: +Артур Клесун
versions: +Python 3.5

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<http://bugs.python.org/issue8704>
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