Always attempt to set the Connection: close response header
#429
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3.0.0 (2024-02-04) ------------------ - Rename "master" git branch to "main" - Fix a bug that would appear on macOS whereby if we accept() a socket that is already gone, setting socket options would fail and take down the server. See Pylons/waitress#399 - Fixed testing of vendored asyncore code to not rely on particular naming for errno's. See Pylons/waitress#397 - HTTP Request methods and versions are now validated to meet the HTTP standards thereby dropping invalid requests on the floor. See Pylons/waitress#423 - No longer close the connection when sending a HEAD request response. See Pylons/waitress#428 - Always attempt to send the Connection: close response header when we are going to close the connection to let the remote know in more instances. Pylons/waitress#429 - Python 3.7 is no longer supported. Add support for Python 3.11, 3.12 and PyPy 3.9, 3.10. See Pylons/waitress#412 - Document that trusted_proxy may be set to a wildcard value to trust all proxies. See Pylons/waitress#431
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While working on #428, I pondered the idea that closing the connection should cause client-side complaints of broken connections. It looks like
Task.close_on_finishis sometimes set to true alongside aConnection: closeheader and other times not. If headers have not been written yet, it makes sense to always includeConnection: closewhenclose_on_finishis set. This pull request adds a utility that sets both of these values together. This results in better connection handling for clients.There are a couple caveats:
Connectionalready has a directive in the response headers, we will not set itThere is also not particularly simple way to ensure that people call this method correctly unless we want to introduce a property for this variable — but I'm not really into properties with side-effects.
I believe this change does not invalidate #428 but it does also resolve #427.