Lofesa commented on issue #1650: how to check pagespeed optimized content or not?? URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1650#issuecomment-494345594 Hi yes if the image is converted from jpg to webp, the header is here. But a image can be converted to webp or not (depend on headers requested by brownser) but (it depend on enabled filter) maybe rewited to other jpg file (adjusting size to the rendered dimensions, for example). But not only images are optimized, the cache life time for a pdf file can be extended to a year, so the url is rewrited too. I don´t understand what you mean with "...without rewriting html...". The html is rewited by pagespeed module to set these news url. All files that are optimized by pagespeed module have the header x-pagespeed: (version).
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