Typical Wordpress VCL for Varnish 4

wordpress.vcl

vcl 4.0;

import std;

backend default {
  .host = "127.0.0.1";
  .port = "8080";
  .max_connections = 300;
  .first_byte_timeout     = 100s;
  .connect_timeout        = 10s;
  .between_bytes_timeout  = 5s;
}

acl purge {
  "192.168.33.10";
  "localhost";
  "127.0.0.1";
  "::1";
}

sub purge_regex {
	ban("obj.http.X-Req-URL ~ " + req.url + " && obj.http.X-Req-Host == " + req.http.host);
}

sub purge_exact {
	ban("obj.http.X-Req-URL == " + req.url + " && obj.http.X-Req-Host == " + req.http.host);
}

sub purge_page {
	set req.url = regsub(req.url, "\?.*$", "");
	ban("obj.http.X-Req-URL-Base == " + req.url + " && obj.http.X-Req-Host == " + req.http.host);
}

sub vcl_recv {
  set req.http.Host = regsub(req.http.Host, ":[0-9]+", "");
  set req.url = std.querysort(req.url);
  
  if (req.method == "PURGE") {
    if (!client.ip ~ purge) {
      return (synth(405, "Not allowed."));
    }
    if (req.http.X-Purge-Method) {
      if (req.http.X-Purge-Method ~ "(?i)regex") {
        call purge_regex;
      } elsif (req.http.X-Purge-Method ~ "(?i)exact") {
        call purge_exact;
      } else {
        call purge_page;
      }
    } else {
      if (req.url ~ "\.\*" || req.url ~ "^\^" || req.url ~ "\$$" || req.url ~ "\\[.?*+^$|()]") {
        call purge_regex;
      } elsif (req.url ~ "\?") {
        call purge_exact;
      } else {
        call purge_page;
      }
    }
    return (synth(200, "Purged."));
  }
  
  if (req.method != "GET" &&
      req.method != "HEAD" &&
      req.method != "PUT" &&
      req.method != "POST" &&
      req.method != "TRACE" &&
      req.method != "OPTIONS" &&
      req.method != "PATCH" &&
      req.method != "DELETE") {
    return (pipe);
  }

  if (req.method != "GET" && req.method != "HEAD") {
    return (pass);
  }

  if (req.url ~ "(\?|&)(utm_source|utm_medium|utm_campaign|utm_content|gclid|cx|ie|cof|siteurl)=") {
    set req.url = regsuball(req.url, "&(utm_source|utm_medium|utm_campaign|utm_content|gclid|cx|ie|cof|siteurl)=([A-z0-9_\-\.%25]+)", "");
    set req.url = regsuball(req.url, "\?(utm_source|utm_medium|utm_campaign|utm_content|gclid|cx|ie|cof|siteurl)=([A-z0-9_\-\.%25]+)", "?");
    set req.url = regsub(req.url, "\?&", "?");
    set req.url = regsub(req.url, "\?$", "");
  }

  if (req.url ~ "\#") {
    set req.url = regsub(req.url, "\#.*$", "");
  }

  if (req.url ~ "\?$") {
    set req.url = regsub(req.url, "\?$", "");
  }

  set req.http.Cookie = regsuball(req.http.Cookie, "has_js=[^;]+(; )?", "");
  set req.http.Cookie = regsuball(req.http.Cookie, "__utm.=[^;]+(; )?", "");
  set req.http.Cookie = regsuball(req.http.Cookie, "_ga=[^;]+(; )?", "");
  set req.http.Cookie = regsuball(req.http.Cookie, "_gat=[^;]+(; )?", "");
  set req.http.Cookie = regsuball(req.http.Cookie, "utmctr=[^;]+(; )?", "");
  set req.http.Cookie = regsuball(req.http.Cookie, "utmcmd.=[^;]+(; )?", "");
  set req.http.Cookie = regsuball(req.http.Cookie, "utmccn.=[^;]+(; )?", "");
  set req.http.Cookie = regsuball(req.http.Cookie, "__gads=[^;]+(; )?", "");
  set req.http.Cookie = regsuball(req.http.Cookie, "__qc.=[^;]+(; )?", "");
  set req.http.Cookie = regsuball(req.http.Cookie, "__atuv.=[^;]+(; )?", "");
  set req.http.Cookie = regsuball(req.http.Cookie, "^;\s*", "");
  if (req.http.cookie ~ "^\s*$") {
    unset req.http.cookie;
  }

  if (req.url ~ "^[^?]*\.(7z|avi|bmp|bz2|css|csv|doc|docx|eot|flac|flv|gif|gz|ico|jpeg|jpg|js|less|mka|mkv|mov|mp3|mp4|mpeg|mpg|odt|otf|ogg|ogm|opus|pdf|png|ppt|pptx|rar|rtf|svg|svgz|swf|tar|tbz|tgz|ttf|txt|txz|wav|webm|webp|woff|woff2|xls|xlsx|xml|xz|zip)(\?.*)?$") {
    unset req.http.Cookie;
    return (hash);
  }
  
  if (req.url ~ "wp-(login|admin)" || req.url ~ "preview=true") {
    return (pass);
  }  
  
  if (req.http.Cookie ~ "wordpress_" || req.http.Cookie ~ "comment_") {
	return (pass);
  }  

  if (req.http.Authorization) {
    return (pass);
  }

  return (hash);
}

sub vcl_hash {
  if (req.http.Accept-Encoding) {
    hash_data(req.http.Accept-Encoding);
  }
}

sub vcl_backend_response {
  set beresp.http.X-Req-Host = bereq.http.host;
  set beresp.http.X-Req-URL = bereq.url;
  set beresp.http.X-Req-URL-Base = regsub(bereq.url, "\?.*$", "");
  
  if (bereq.url ~ "^[^?]*\.(7z|avi|bmp|bz2|css|csv|doc|docx|eot|flac|flv|gif|gz|ico|jpeg|jpg|js|less|mka|mkv|mov|mp3|mp4|mpeg|mpg|odt|otf|ogg|ogm|opus|pdf|png|ppt|pptx|rar|rtf|svg|svgz|swf|tar|tbz|tgz|ttf|txt|txz|wav|webm|webp|woff|woff2|xls|xlsx|xml|xz|zip)(\?.*)?$") {
    unset beresp.http.set-cookie;
  } 

  if (bereq.url ~ "^[^?]*\.(7z|avi|bz2|flac|flv|gz|mka|mkv|mov|mp3|mp4|mpeg|mpg|ogg|ogm|opus|rar|tar|tgz|tbz|txz|wav|webm|xz|zip)(\?.*)?$") {
    set beresp.do_stream = true;
    set beresp.do_gzip   = false;
  }
  
  if (bereq.url ~ "wp-(login|admin)" || bereq.url ~ "preview=true") {
    set beresp.uncacheable = true;
    set beresp.ttl = 120s;
    return (deliver);
  }

  if (!(bereq.url ~ "(wp-login|wp-admin|preview=true)")) {
    unset beresp.http.set-cookie;
  }  

  if (beresp.ttl <= 0s || beresp.http.Set-Cookie || beresp.http.Vary == "*") {
    set beresp.ttl = 120s;
    set beresp.uncacheable = true;
    return (deliver);
  }

  set beresp.grace = 6h;

  return (deliver);
}

sub vcl_deliver {

  if (obj.hits > 0) {
    set resp.http.X-Cache = "HIT";
  } else {
    set resp.http.X-Cache = "MISS";
  }

  set resp.http.X-Cache-Hits = obj.hits;
  
  unset resp.http.X-Req-Host;
  unset resp.http.X-Req-URL;
  unset resp.http.X-Req-URL-Base;  
  unset resp.http.X-Powered-By;
  unset resp.http.Server;
  unset resp.http.X-Varnish;
  unset resp.http.Via;
  unset resp.http.Link;
  unset resp.http.X-Generator;

  return (deliver);
}

hi sir, thanks.
i use your config for my wordpress, but i get message 503 fecth failed.

can you help me ?