eldk edited a comment on issue #1850: Intermittent 404 errors with Invalid resource signature URL: https://github.com/apache/incubator-pagespeed-mod/issues/1850#issuecomment-449013921 ModPagespeedUrlSigningKey is used ModPagespeedAcceptInvalidSignatures is'nt in use. https://groups.google.com/d/msg/mod-pagespeed-discuss/s16XgJ2IZhw/FTNji9sDIH8J But the expected signature key seems to be wrong : `Expected 8sJtkrQCNg Received 5obJN_uvmC` In next succeeded request the key seems to be 5obJN_uvmC : no error is thrown and key is in ressource url : `xbandeau_la_maille_images.jpg.pagespeed.ic.Not8aSW8hh5obJN_uvmC.jpg` So something is intermittently weird in expected key ? https://github.com/apache/incubator-pagespeed-mod/blob/b4bf44cc56d8bbf17494c540dfb6ef20dfcf5073/net/instaweb/rewriter/output_resource.cc#L285 https://github.com/apache/incubator-pagespeed-mod/blob/b4bf44cc56d8bbf17494c540dfb6ef20dfcf5073/net/instaweb/rewriter/output_resource.cc#L315
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