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From GitBox <...@apache.org>
Subject [GitHub] Enalmada opened a new issue #1760: ModPagespeedAddResourceHeader Access-Control-Allow-Origin duplicate headers
Date Wed, 21 Mar 2018 23:41:55 GMT
Enalmada opened a new issue #1760: ModPagespeedAddResourceHeader Access-Control-Allow-Origin
duplicate headers
URL: https://github.com/apache/incubator-pagespeed-mod/issues/1760
 
 
   My server returns proper cors headers for every asset but I noticed that pagespeed optimized
assets would not always return the header.  I found this [doc ](https://www.modpagespeed.com/doc/configuration#add-resource-header)
 suggesting I need to use ModPagespeedAddResourceHeader.  I added it, cleared my pagespeed
cache and everything was fine for a while on production but later people started calling me
saying the site was broken and I could see chrome complaining about duplicate Access-Control-Allow-Origin
headers on optimized assets.  Feeling like an idiot for messing up the flush or something,
I flushed again and everything was fine for a while.  But I have seen chrome errors pop up
again that go away when I add PageSpeed=off.  This is a critical issue because chrome refuses
to load content with duplicate headers completely destroying the site.  I have had to turn
it off to stop the random errors but I love pagespeed and want it back.
   
   Is it possible to ensure that ModPagespeedAddResourceHeaders feature never duplicates headers?
 Perhaps it can filter the defined header from incoming responses it is storing, or only adds
the header to outgoing response if it is not already there?    

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