nginx服务器配置了ngx_pagespeed的模块之后有可能会出现资源加载错误404未找到的情况。Pagespeed重命名静态资源（如图像、CSS等）文件名以标记为已优化，在某些情况下，Pagespeed优化的网页资源返回404未找到，并且在几次浏览器刷新后，它们最终会加载。在这种情况下，Pagespeed仍在优化网页资源的过程中。如果服务器使用的是nginx则可以如下配置：
## Pagespeed optimized resources that returns 404, redirect to original resource
location ~ (.+)/x(.+),(.+)\.pagespeed\.[\.\-_[:alnum:]]+$ {
# Handle resources with query string and Pagespeed optimized resources with
# file name prefixed with x (eg. xMyImage.png,qitok=qwer.pagespeed.asdf.webp)
error_page 404 = @orig_resource;
set $orig_resource_uri $1/$2?$3;
try_files $uri $uri/ $orig_resource_uri;
}
location ~ (.+),(.+)\.pagespeed\.[\.\-_[:alnum:]]+$ {
# Handle resources with query string
error_page 404 = @orig_resource;
set $orig_resource_uri $1?$2;
try_files $uri $uri/ $orig_resource_uri;
}
location ~ (.+)/x(.+)\.pagespeed\.[\.\-_[:alnum:]]+$ {
# Handle Pagespeed optimized resources with file name prefixed with x
# (eg. xMyImage.png.pagespeed.asdf.webp)
error_page 404 = @orig_resource;
set $orig_resource_uri $1/$2;
try_files $uri $uri/ $orig_resource_uri;
}
location ~ (.+)\.pagespeed\.[\.\-_[:alnum:]]+$ {
# Default handler
error_page 404 = @orig_resource;
set $orig_resource_uri $1;
try_files $uri $uri/ $orig_resource_uri;
}
## Redirect Pagespeed optimized resources that returns 404 to
## original resource.
location @orig_resource {
return 302 $scheme://$server_name$orig_resource_uri;
}上面的脚本将捕获Pagespeed重命名的资源静态文件，然后首先检查是否存在Pagespeed重命名的源静态文件，如果没有找到，则重定向到原始资源。
建议按以下方式放置脚本：
server {
# ... your server context script
location / {
# ... some location context script
## Pagespeed optimized resources that returns 404, redirect to original resource
location ~ (.+)/x(.+),(.+)\.pagespeed\.[\.\-_[:alnum:]]+$ {
# Handle resources with query string and Pagespeed optimized resources with
# file name prefixed with x (eg. xMyImage.png,qitok=qwer.pagespeed.asdf.webp)
error_page 404 = @orig_resource;
set $orig_resource_uri $1/$2?$3;
try_files $uri $uri/ $orig_resource_uri;
}
location ~ (.+),(.+)\.pagespeed\.[\.\-_[:alnum:]]+$ {
# Handle resources with query string
error_page 404 = @orig_resource;
set $orig_resource_uri $1?$2;
try_files $uri $uri/ $orig_resource_uri;
}
location ~ (.+)/x(.+)\.pagespeed\.[\.\-_[:alnum:]]+$ {
# Handle Pagespeed optimized resources with file name prefixed with x
# (eg. xMyImage.png.pagespeed.asdf.webp)
error_page 404 = @orig_resource;
set $orig_resource_uri $1/$2;
try_files $uri $uri/ $orig_resource_uri;
}
location ~ (.+)\.pagespeed\.[\.\-_[:alnum:]]+$ {
# Default handler
error_page 404 = @orig_resource;
set $orig_resource_uri $1;
try_files $uri $uri/ $orig_resource_uri;
}
}
## Redirect Pagespeed optimized resources that returns 404 to
## original resource.
location @orig_resource {
return 302 $scheme://$server_name$orig_resource_uri;
}
} 
