traeak commented on issue #7974:
URL: https://github.com/apache/trafficserver/issues/7974#issuecomment-867864845
Workaround is to add 2 header rewrites, one before and one after the
background_fetch plugin with example rewrites:
before:
```
cond %{READ_RESPONSE_HDR_HOOK}
cond %{CLIENT-HEADER:Range} = "" [NOT]
cond %{STATUS} = 200
set-status 206
set-header X-Was200 true
```
after:
```
cond %{READ_RESPONSE_HDR_HOOK}
cond %{HEADER:X-Was200} = "" [NOT]
set-status 200
rm-header X-Was200
```
Probably can use a private header instead of an X- header.
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