Strip Content-Length: 0 from responses that should not have a Content-Length#43417
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We made a change (earlier in RC1, #43103) that tightened up Kestrel's Content-Length handling. Part of the change made it so that we throw if a
Content-Lengthis set on responses that shouldn't have aContent-Length(1xx, 204 responses, or any 2xx responses to a CONNECT request).This change keeps that behavior for nonzero values of
Content-Length. If theContent-Lengthis present but it's zero, we will now just remove it instead of throwing, since its absence is semantically equivalent.We keep the existing behavior for 205's (the spec allows Content-Length 0 for those explicitly).
This is the remainder of the RC1 fix for #43316