Lofesa commented on issue #1988: x-content-type-options nosniff duplicated URL: https://github.com/apache/incubator-pagespeed-mod/issues/1988#issuecomment-614855668 Yes, I know that rewrited resources have only 1 header, so you need to add it to the no rewrited ones. What happens with this css? Is a , half optimized resource. With half optimized I will say: some optimizations are applied but the url is not rewrited. The optimizations come from the IPRO, an in-fligth optimizer, but IPRO don´t add these header. Maybe is in a transient state denoted by the s-max-age=10 in the cache-control header, this make the resource can´t be stored in intermediate caches more than 10 sec. This file can´t change to a rewrited version? If this file can´t change to a rewrited version, some thing is wrong. Have images in this file? if this file have images in it, if a webp capable browser hit it, these images are converted to webp but if a non webp capable hit it after then the file get not optimized and the whole optimization process will start again to set jpg optimizations. The headers-Replace first do a RemoveAll and then an Add, so this 2nd header mus come from an Add not from a Replace. The workaround must include a thest for the response header don´t have the PSA string and the url don´t have the pagespeed string. What happens if you don´t add the header in apache config?
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