jstangroome commented on issue #1556: Combined css returns truncated, mis-encoded body on cache hit URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1556#issuecomment-388261484 I've done some further investigation. The URL that is failing doesn't exactly match the URL present in the HTML. The pagespeed hashes in the URL are different. From this I've been able to reproduce the issue more reliably. Take the URL from the HTML (it must be `cc` [combine_css] and `cf` [rewrite_css]), e.g.: `/css/A.store.css+vendor.css,Mcc.HBFc8IpUqh.css.pagespeed.cf.OBCdvpW_8K.css` Change the `cc` hash, changing the first `H` to a `h` instead is enough in this example: `/css/A.store.css+vendor.css,Mcc.hBFc8IpUqh.css.pagespeed.cf.OBCdvpW_8K.css` Request the URL once with `Accept-Encoding: gzip` and get a cache miss and a correct response. Request it again and get a cache hit and an incorrectly decompress body. If only `combine_css` is used and `rewrite_css` is removed, it does not occur - it seems to be related to the way the two filters interact. Modifying the `cf` hash seems to have no impact.
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