Hi all, I'm trying to replace some of my legacy AddOutputFilterByType
configuration directives with the more flexible dynamic syntax.
I have a reverse proxy set up in front of a server that is likely to
provide gzip compressed data.
I need to use mod_substitute to do a search and replace on the
text/html files however, so I have to ensure that I do not have a
gzip'd stream (mod_substitute can't handle this).
Old:
RequestHeader unset Accept-Encoding
AddOutputFilterByType SUBSTITUTE text/html
Substitute "s|wrongtext|rightext|n"
<Location />
Proxy Pass ...
ProxyPassReverse ...
</Location>
New:
FilterProvider gzinflate INFLATE resp=Content-Encoding $gzip
FilterProvider replace SUBSTITUTE Content-Type $text/
FilterProvider gzdeflate DEFLATE Content-Type $text/
# I believe the + is not needed in my case..
FilterChain +gzinflate +replace +gzdeflate
Substitute "s|wrongtext|rightext|n"
<Location />
Proxy Pass ...
ProxyPassReverse ...
</Location>
Both blocks work, but I'm thinking I could potentially end up calling
gzdeflate on data that wasn't originally compressed. Maybe someone can
clarify:
- Does each member of a FilterChain get called regardless? For
example:
text/html (uncompressed) doesn't match on the gzinflate line, but
would one he next two. I'd end up with compressed output that
wasn't originally compressed.
- If so, should I set an environment variable if Content-Encoding =
gzip and then have my gzdeflate provider check for it instead of
operating blindly on all text/* ?
Or maybe some way to check if the request we're responding to had
Accept-Encoding gzip set?
Thanks,
Ray
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