Cache-Control being overwritten for application/json types

[Ryan S.]

I have some web services that return JSON data with the Content-type of application/json.  PageSpeed is overwriting the Cache-Control headers I send even with 

ModPagespeedModifyCachingHeaders off

It is always sending:

1. Cache-Control:
   max-age=0, no-cache

While also killing my gzipping.  

The response headers before PageSpeed are:

1. Connection:
   Keep-Alive
2. Content-Encoding:
   gzip
3. Content-Length:
   700
4. Content-Type:
   application/json
5. Date:
   Tue, 16 Feb 2016 22:09:57 GMT
6. Expires:
   Tue, 16 Feb 2016 23:09:57 GMT
7. Keep-Alive:
   timeout=2, max=1000
8. Server:
   Apache
9. ServerID:
   php-dev01
10. Vary:
    Accept-Encoding

The headers after are:

1. Cache-Control:
   max-age=0, no-cache
2. Connection:
   Keep-Alive
3. Content-Length:
   5574
4. Content-Type:
   application/json
5. Date:
   Tue, 16 Feb 2016 22:10:24 GMT
6. Etag:
   W/"PSA-Xgxb1zUWTX"
7. Expires:
   Tue, 16 Feb 2016 23:03:43 GMT
8. Keep-Alive:
   timeout=2, max=999
9. Server:
   Apache
10. ServerID:
    php-dev02
11. Vary:
    Accept-Encoding
12. X-Content-Type-Options:
    nosniff

I am on the latest version and have tried everything I can think of to fix the Cache-Control and Content-Encoding.

Please help. Thanks!

[Otto van der Schaaf]

Could you file an issue for this at https://github.com/pagespeed/mod_pagespeed/issues ?

You could work around the problem by disallowing optimization for this resource, see https://developers.google.com/speed/pagespeed/module/restricting_urls#disallow

Otto

[Ryan S.]

Thanks.  I filed an issue.