Piotr is working his magic for ngx_pagespeed 1.10 <a href="https:&#x2F;&#x2F;github.com&#x2F;pagespeed&#x2F;ngx_pagespeed&#x2F;issues&#x2F;1114" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;pagespeed&#x2F;ngx_pagespeed&#x2F;issues&#x2F;1114</a> just need a patch for 1.9 branch too