If you have mod_pagespeed installed on your webserver you may notice the following lines in access.log file:
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*ipofserver* - - [24/Jan/2019:13:40:13 +0100] "GET /wp-content/***.jpg HTTP/1.1" 200 1806 "https://***.com/*" "Serf/1.3.9 (mod_pagespeed/1.13.35.2-0)" *ipofserver* - - [24/Jan/2019:13:40:13 +0100] "GET /wp-content/***.jpg HTTP/1.1" 200 1806 "https://***.com/*" "Serf/1.3.9 (mod_pagespeed/1.13.35.2-0)" *ipofserver* - - [24/Jan/2019:13:40:13 +0100] "GET /wp-content/***.jpg HTTP/1.1" 200 1806 "https://***.com/*" "Serf/1.3.9 (mod_pagespeed/1.13.35.2-0)" |
Depending on the size of your website requests from mod_pagespeed can add flood your logfiles and their size will be significantly larger. Here is how you can exclude mod_pagespeed requests from access.log file
