esmq2092 commented on issue #7459:
URL: https://github.com/apache/trafficserver/issues/7459#issuecomment-799158895
follow your advice, i use header_rewrite to achieve the goal. ^-^
cond %{READ_REQUEST_HDR_HOOK}
cond %{HEADER:Accept} /webp/
set-header TEST-IMG-FMT webp
cond %{READ_RESPONSE_HDR_HOOK}
cond %{HEADER:Content-Type} /image/
add-header Vary TEST-IMG-FMT
add-header TEST-IMG-FMT webp
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