Removed a warning that was displayed for HEAD requests.

[madjar]

application returned too few bytes (0) for specified Content-Length (85506) via app_iter

I kept getting this warning when doing HEAD requests, but it seems normal to me to get no content in a head request. I made waitress check if the request is a HEAD before issuing the warning.

This patch comes with a test, and a little fix to the tests (first of the two commits).

[mcdonc]

Thank you!

[mcdonc]

Thank you!

[merwok]

Can I ask if this fix is part of a released version? I ran into it today.

[merwok]

Can I ask if this fix is part of a released version? I ran into it today.

[davidjb]

@merwok: seemingly not yet. It's still in the 'Next Release' section of the change log.

[davidjb]

@merwok: seemingly not yet. It's still in the 'Next Release' section of the change log.

[mcdonc]

0.8.3 just released with the fix.

[mcdonc]

0.8.3 just released with the fix.

[davidjb]

Thanks @mcdonc!

[davidjb]

Thanks @mcdonc!

[merwok]

✨

[merwok]

✨