floom4 opened a new pull request, #12748:
URL: https://github.com/apache/trafficserver/pull/12748

   HEAD method with "Content-Length" header was returning 502 code because 
header differs from payload length as there is no payload in this case.
   
   See https://datatracker.ietf.org/doc/html/rfc7540#section-8.1.2.6
   ```
   A response that is defined to have no payload, as described in [RFC7230], 
Section 3.3.2, can have a non-zero content-length header field, even though no 
content is included in DATA frames.
   ```
   
   See issue #12747 
   
   The change fix the behavior by returning true if `data_length` is 0 meaning 
that the response has no payload, allowing for non-zero 'Content-Length'


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