bryancall commented on issue #7590:
URL: https://github.com/apache/trafficserver/issues/7590#issuecomment-818111896
A 502 would be more appropriate for an origin server that send a
non-supported Transfer-Encoding:
```
6.6.2. 501 Not Implemented
The 501 (Not Implemented) status code indicates that the server does
not support the functionality required to fulfill the request. This
is the appropriate response when the server does not recognize the
request method and is not capable of supporting it for any resource.
A 501 response is cacheable by default; i.e., unless otherwise
indicated by the method definition or explicit cache controls (see
Section 4.2.2 of [RFC7234]).
6.6.3. 502 Bad Gateway
The 502 (Bad Gateway) status code indicates that the server, while
acting as a gateway or proxy, received an invalid response from an
inbound server it accessed while attempting to fulfill the request.
```
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