HTTP/1.1: Transfer-Encoding:identity is prohibited#2427
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HTTP specification deprecated identity encoding but still allows its use when the Transfer-Encoding header is otherwise correctly used. Squid compliance update at the time kept accepting this encoding as it was being used by agents. However the HTTP specification explicitly requires that encoding to be wrapped within chunked encoding. The bare Transfer-Encoding:identity form is explicitly prohitibed with a MUST apply chunked requirement.
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HTTP specification deprecated identity encoding but still allows
its use as an unknown encoding when the Transfer-Encoding
header is otherwise correctly used.
Squid compliance update at the time kept accepting identity
encoding as it was being used by agents. The form supported was
Transfer-Encoding:identity.
However, the HTTP specification explicitly requires that any
encoding MUST be wrapped within chunked encoding.
As such the bare Transfer-Encoding:identity form Squid accepted
is explicitly prohibited.
The correct Transfer-Encoding:identity,chunked syntax has been
rejected by Squid for nearly 5 years already without complaint.
So support is being dropped entirely here.