ngx_pagespeed downstream caching config file

wp.conf

server {
	listen 80;
	server_name wp;
	pagespeed off;
	server_tokens off;
	set $skip_cache 0;

# POST requests and urls with a query string should always go to PHP
	if ($request_method = POST) {
		set $skip_cache 1;
	}
	if ($query_string != "") {
		set $skip_cache 1;
	}

# Don't cache uris containing the following segments
	if ($request_uri ~* "/wp-admin/|/xmlrpc.php|wp-.*.php|/feed/|index.php|sitemap(_index)?.xml") {
		set $skip_cache 1;
	}

# Don't cache uris for wp social login
	if ($request_uri ~* "/wp-content/plugins/wordpress-social-login/hybridauth/?") {
		set $skip_cache 1;
	}
# Don't use the cache for logged in users or recent commenters
	if ($http_cookie ~* "comment_author|wordpress_[a-f0-9]+|wp-postpass|wordpress_no_cache|wordpress_logged_in") {
		set $skip_cache 1;
	}


# ******** https://developers.google.com/speed/pagespeed/module/downstream-caching ********

# Block 2: Define prefix for proxy_cache_key based on the UserAgent.

    # Define placeholder PS-CapabilityList header values for large and small
    # screens with no UA dependent optimizations. Note that these placeholder
    # values should not contain any of ll, ii, dj, jw or ws, since these
    # codes will end up representing optimizations to be supported for the
    # request.
    set $default_ps_capability_list_for_large_screens "LargeScreen.SkipUADependentOptimizations";
    set $default_ps_capability_list_for_small_screens "TinyScreen.SkipUADependentOptimizations";

    # As a fallback, the PS-CapabilityList header that is sent to the upstream
    # PageSpeed server should be for a large screen device with no browser
    # specific optimizations.
    set $ps_capability_list $default_ps_capability_list_for_large_screens;

    # Cache-fragment 1: Desktop User-Agents that support lazyload_images (ll),
    # inline_images (ii) and defer_javascript (dj).
    # Note: Wget is added for testing purposes only.
    if ($http_user_agent ~* "Chrome/|Firefox/|Gecko|Trident/6\.|Safari|Wget") {
      set $ps_capability_list "ll,ii,dj:";
    }
    # Cache-fragment 2: Desktop User-Agents that support lazyload_images (ll),
    # inline_images (ii), defer_javascript (dj), webp (jw) and lossless_webp
    # (ws).
    if ($http_user_agent ~*
        "Chrome/[2][3-9]+\.|Chrome/[[3-9][0-9]+\.|Chrome/[0-9]{3,}\.") {
      set $ps_capability_list "ll,ii,dj,jw,ws:";
    }
    # Cache-fragment 3: This fragment contains (a) Desktop User-Agents that
    # match fragments 1 or 2 but should not because they represent older
    # versions of certain browsers or bots and (b) Tablet User-Agents that
    # correspond to large screens. These will only get optimizations that work
    # on all browsers and use image compression qualities applicable to large
    # screens. Note that even Tablets that are capable of supporting inline or
    # webp images, e.g. Android 4.1.2, will not get these advanced
    # optimizations.
    if ($http_user_agent ~* "Firefox/[1-2]\.|bot|Yahoo!|Ruby|RPT-HTTPClient|(Google \(\+https\:\/\/developers\.google\.com\/\+\/web\/snippet\/\))|Android|iPad|TouchPad|Silk-Accelerated|Kindle Fire") {
      set $ps_capability_list $default_ps_capability_list_for_large_screens;
    }
    # Cache-fragment 4: Mobiles and small screen Tablets will use image compression
    # qualities applicable to small screens, but all other optimizations will be
    # those that work on all browsers.
    if ($http_user_agent ~* "Mozilla.*Android.*Mobile*|iPhone|BlackBerry|Opera Mobi|Opera Mini|SymbianOS|UP.Browser|J-PHONE|Profile/MIDP|portalmmm|DoCoMo|Obigo|Galaxy Nexus|GT-I9300|GT-N7100|HTC One|Nexus [4|7|S]|Xoom|XT907") {
      set $ps_capability_list $default_ps_capability_list_for_small_screens;
    }

# Block 3a: Bypass the cache for .pagespeed. resource. PageSpeed has its own
    # cache for these, and these could bloat up the caching layer.
    if ($uri ~ "\.pagespeed\.([a-z]\.)?[a-z]{2}\.[^.]{10}\.[^.]+") {
      set $skip_cache 1;
    }

# Block 3b: Only cache responses to clients that support gzip.  Most clients
    # do, and the cache holds much more if it stores gzipped responses.
    if ($http_accept_encoding !~* gzip) {
      set $skip_cache 1;
    }

# Block 4: Location block for purge requests.
    location ~ /purge(/.*) {
#      allow localhost;
      allow 127.0.0.1;
#      allow YOUR-SERVER-IP;
      deny all;
      proxy_cache_purge proxycache $ps_capability_list$1$is_args$args;
    }


# Block 6: Location block with proxy_cache directives.
    location / {
      
      # 1: Upstream PageSpeed server is running at localhost:8050.
      proxy_pass http://127.0.0.1:8080;

      # 2: Use htmlcache as the zone for caching.
      proxy_cache proxycache;

      # 3: Bypass requests that correspond to .pagespeed. resources
      # or clients that do not support gzip etc.
      proxy_cache_bypass $skip_cache;

      # 4: Use the redefined proxy_cache_key and make sure the /purge/
      # block uses the same key.
      proxy_cache_key $ps_capability_list$uri$is_args$args;

      # 5: Forward Host header to upstream server.
      proxy_set_header Host $host;

      # 6: Set the PS-CapabilityList header for PageSpeed server to respect.
      proxy_set_header PS-CapabilityList $ps_capability_list;

      # 7: Add a header for identifying cache hits/misses/expires. This is
      # for debugging purposes only and can be commented out in production.
      add_header X-Cache $upstream_cache_status;

	 # Block 5b: Override Cache-Control headers as needed.
     # Hide the upstream cache control header.
     proxy_hide_header Cache-Control;
     # Add the inferred Cache-Control header.
     add_header Cache-Control $new_cache_control_header_val;

#********* Other settings
	proxy_set_header X-Real-IP $remote_addr;
	proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;  
	proxy_cache_valid  200 302  60m;
	proxy_cache_valid  404      1m;
	proxy_ignore_headers "Set-Cookie";

    }



# **********************************************

}

server {
	listen 8080;
	server_name wp;
	root /var/www/wp;
	index index.php index.html index.htm;
	server_tokens off;

	pagespeed on;

	location /{
		pagespeed DownstreamCachePurgeLocationPrefix http://localhost:80;
		pagespeed DownstreamCachePurgeMethod GET;
		pagespeed DownstreamCacheRewrittenPercentageThreshold 95;
		try_files $uri $uri/ /index.php?$args;
	}
        pagespeed Domain http://wp;
        pagespeed LoadFromFile "http://wp/" "/var/www/wp/";
        pagespeed FileCachePath /var/run/ngx_pagespeed_cache;
        pagespeed RewriteLevel PassThrough;
        pagespeed EnableFilters collapse_whitespace;
        pagespeed EnableFilters canonicalize_javascript_libraries;
        pagespeed EnableFilters combine_css;
        pagespeed EnableFilters combine_javascript;
        pagespeed EnableFilters elide_attributes;
        pagespeed EnableFilters extend_cache;
        pagespeed EnableFilters flatten_css_imports;
        pagespeed CssFlattenMaxBytes 5120;
        pagespeed EnableFilters lazyload_images;
        pagespeed EnableFilters rewrite_javascript;
        pagespeed EnableFilters rewrite_images;
        pagespeed EnableFilters insert_dns_prefetch;
        pagespeed EnableFilters prioritize_critical_css;
        pagespeed EnableFilters defer_javascript;

	location ~ \.php$ {
		fastcgi_pass unix:/var/run/php5-fpm.sock;
		fastcgi_index index.php;
		fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
		include /etc/nginx/fastcgi_params;
	#	add_header Cache-Control "public, max-age=600";
	}
}