luison edited a comment on issue #1626: LoadFromFileCacheTtlMs does not control how often the file-system is re-checked. URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1626#issuecomment-470698854 Hi. Sorry to jump into this specific query but I am trying to understand the updating system of sources of pagespeed when using the extended_cache filter related to the LoadFromFileCacheTtlMs I posted a question on the google group (https://goo.gl/SgCWBj) but I'll try to briefly ask my question here as I am about to give up on it. We are trying to improve a nginx cache proxy in front of various apache servers on containers. Our setup was intercepting static content... (css, js, images, etc) extending cache headers, proxying and caching: client --> nginx proxy cache for css, js, images.. --> backend apache client --> nginx proxy (no cache) for the rest --> backend apache Our intention now is to add pagespeed in order to improve in general and particularly css and JS further by concatenating (css + js) and properly versioning to extend caches which I understand is exactly what extended_cache filter does. (A list of our active filters bellow.) Our doubts/issues are coming from some css and JS after treated by pagespeed do not get updated after a change and remain staled. This happens even if we've: 1. forced the expires headers of the apache backend to 30 seconds. Would pagespeed use this value at all as a TTL to recheck the backend or will it use the one returned by the nginx-cache? 2.- forced the nginx-proxy-cache for static files to bypass the cache and set it to no-store for testing. Again... is pagespeed using this or the backend expires? 3.- cleared the cache for the specific file (ie /ass/skins/def/css/bootstrap.min.css+main.gis.css.pagespeed.cc.7FZQ-V4k-L.css) via the /pagespeed_admin. Only when clearing the whole pagespeed cache... the file gets updated So a file as /ass/skins/def/css/bootstrap.min.css+main.gis.css.pagespeed.cc.7FZQ-V4k-L.css remains so after a change on the backend whatsoever. This is what that root reports in the cache: ``` Metadata cache key:rname/cc_A5CWJ1Ij7nG9n_XUZo0i/t/vozrWfLE89IPR4eF0bW@ cache_ok:true can_revalidate:false partitions:partition { optimizable: true url: "https://xxxxxx/ass/skins/def/css/bootstrap.min.css+main.gis.css.pagespeed.cc.7FZQ-V4k-L.css"; input { index: 0 type: CACHED last_modified_time_ms: 1547041050000 expiration_time_ms: 1554586471000 date_ms: 1551994471000 input_content_hash: "7Du1KgDhdqcYHUVN_66iG" url: "https://xxxxxxx/ass/skins/def/css/bootstrap.min.css"; } input { index: 1 type: CACHED last_modified_time_ms: 1551993894000 expiration_time_ms: 1554586471000 date_ms: 1551994471000 input_content_hash: "UGK37FuBTQjWD1AQi_GCT" disable_further_processing: true url: "https://xxxxxxxxxxxxxxxxxxxxxxxxxxx/ass/skins/def/css/main.gis.css"; } } ``` Even after clicking "delete" on that, no change. Only once I clear the whole pagespeed cache through the backend I get an updated version. I'm probably not understanding something: - do I require additional setup if using nginx proxy cache as in doc: https://www.modpagespeed.com/doc/downstream-caching.html considering this scenario. I am happy with html not being cached. - does pagespeed "read" files from nginx-cache-proxy or is it aware of the backend upstream too? - Would setting a lower value to LoadFromFileCacheTtlMs change anything? I understand default is 5 minutes if "no expires" header are set. What about if they are? Does the TTL become the Expires of the source brought by http from the backend or as I guess this value is only good for "local" disk access reads? - should I just make nginx act as non-cache proxy and let pagespeed deal completely with that? Thanks. Active FIlters ah Add Head ai Add Instrumentation cc Combine Css jc Combine Javascript gp Convert Gif to Png jp Convert Jpeg to Progressive jw Convert Jpeg To Webp mc Convert Meta Tags pj Convert Png to Jpeg ws When converting images to WebP, prefer lossless conversions ec Cache Extend Css ei Cache Extend Images es Cache Extend Scripts fc Fallback Rewrite Css if Flatten CSS Imports hw Flushes html ci Inline Css ii Inline Images il Inline @import to Link ji Inline Javascript idp Insert DNS Prefetch js Jpeg Subsampling cj Move Css Above Scripts pr Prioritize Critical Css rj Recompress Jpeg rp Recompress Png rw Recompress Webp ri Resize Images cf Rewrite Css jm Rewrite External Javascript jj Rewrite Inline Javascript cu Rewrite Style Attributes With Url cp Strip Image Color Profiles md Strip Image Meta Data
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