backend default { 
 .host = "127.0.0.1"; 
 .port = "8008"; 
 .connect_timeout = 600s; 
 .first_byte_timeout = 600s; 
 .between_bytes_timeout = 600s; 
} 
 
backend lighttpd { 
 .host = "127.0.0.1"; 
 .port = "81"; 
 .connect_timeout = 600s; 
 .first_byte_timeout = 600s; 
 .between_bytes_timeout = 600s; 
} 
 
acl techmission_internal { 
 "localhost"; 
 "127.0.0.1"; 
} 
sub vcl_recv { 
 // Allow a grace period for offering "stale" data in case backend lags (http://varnish-cache.org/wiki/VCLExampleGrace) 
// 如果backend数据滞后，允许为“过时”数据提供一个宽松期 
 set req.grace = 5m; 
 // block outside world from our test sites 
// 阻止非自己说测试网站（的数据访问） 
 if ((req.http.host ~ "www.domain1.org|www.domain2.org") && !(client.ip ~ techmission_internal) && !(req.url ~ "^/ad|^/files")) { 
  error 403 "Forbidden"; 
 } 
 if((req.url ~ "/server-status" || req.url ~ "/whm-server-status") && !(client.ip ~ techmission_internal)) { 
 error 404 "Not Found"; 
 } 
 // add ping url to test Varnish status 
// 增加ping URL测试varnish状态（这个功能使用大部分vcl都没配置，可以增加一个监控状态） 
 if (req.request == "GET" && req.url ~ "/varnish-ping") { 
 error 200 "OK"; 
 } 
/* Normalize host header to reduce variation in cache */ 
// 使host头规范化，以减少在cache中变化（这个为什么会说变化呢？） 
if (req.http.host == "domain.org" && req.url !~ "^/blogs") { 
 set req.http.host = "www.domain.org"; 
} 
 
/* Normalize Accept-Encoding to reduce effects of Vary: Accept-Encoding  
  (cf. http://varnish-cache.org/wiki/FAQ/Compression) 
  Also note that Vary: User-Agent is considered harmful  
  (cf. http://www.mail-archive.com/varnish-misc@projects.linpro.no/msg03296.html) */ 
//规范化Accept-Encoding以减少Vary：Accept-Encoding影响（cf），也要注意Vary: User-Agent认为是有害的 
 
 if (req.http.Accept-Encoding) { 
//if先判断是否可以存在，是为了缩小处理范围？ 
//看到的其他大部分配置直接就下面了，没有先判断Accept-Encoding是否存在，这点可以再考虑考虑 
//现在有req.can_gzip参数了，判断客户端是否接受压缩代码传输 
  if (req.url ~ "\.(jpg|png|gif|gz|tgz|bz2|tbz|mp3|ogg)$") { 
   // Don't compress already-compressed files 
   remove req.http.Accept-Encoding; 
  }  
  elsif (req.http.Accept-Encoding ~ "gzip") { 
    set req.http.Accept-Encoding = "gzip"; 
  }  
  elsif (req.http.Accept-Encoding ~ "deflate") { 
    set req.http.Accept-Encoding = "deflate"; 
  }  
  else { 
   // unknown algorithm 
// 不了解运算 
   remove req.http.Accept-Encoding; 
  } 
 } 
 
 // Remove has_js and Google Analytics __* cookies. Also remove collapsiblock cookies. 
//删除has_js和谷歌统计__*的cookies，同时删除collapsiblock cookies 
 set req.http.Cookie = regsuball(req.http.Cookie, "(^|;\s*)(__[a-z]+|__utma_a2a|has_js|collapsiblock)=[^;]*", ""); 
 // Remove JSESSIONID cookie from ChristianVolunteering.org static files and pages that are same for all users 
//从ChristianVolunteering.org静态文件和网页中删除JSESSIONID cookie，所有的用户是一样（处理）的 
  if (req.http.host ~ "christianvolunteering.org" && 
     (req.url ~ "^/$" || 
     req.url ~ "(searchform|advancedsearch|shorttermmissions|recruitvolunteers|volunteergettingstarted|virtualvolunteer|organizationsearch|abs-bible-outreach|ab*ecutive-volunteers|abs-traveling-engagement-center|churchinstructions|sitemap|city|virtual|organizationlistings|orglistings7407|technology|volunteerlistings|forgotpassword|churchvolunteer|churchvolunteering|servicetrip|region|citysitemap|searchformadv|personalitytest|groupvolunteering|disasterreliefvolunteering|disasterrelief|internships|christiangapyear|about|FAQs|bookrecommendations|contact|pressrelease|training|volunteerstart|volunteerstories|articles)\.jsp$" || 
     req.url ~ "org/org[0-9]+\.jsp$" || 
     req.url ~ "org/opp[0-9]+\.jsp$" || 
     req.url ~ "orglistings[0-9]+\.jsp$" || 
     req.url ~ "org/[^/]+\.jsp$" || 
     req.url ~ "volunteer/[^/]+\.jsp$") 
    ) {  
  set req.http.Cookie = regsuball(req.http.Cookie, "(^|;\s*)(JSESSIONID)=[^;]*", ""); 
 } 
 // Remove a ";" prefix, if present. 
//如果有”;”前缀，则删除 
 set req.http.Cookie = regsub(req.http.Cookie, "^;\s*", ""); 
 // Remove empty cookies. 
// 删除空cookies 
 if (req.http.Cookie ~ "^\s*$") { 
  unset req.http.Cookie; 
 }  
 
 // exclude umjobs and gospelpedia test sites 
// 排除umjos和gospelpedia测试站点 
 if (req.http.host ~ "domain1.org" || req.http.host ~ "domain2.org") { 
  return (pass); 
 } 
 
 // exclude the cron and supercron pages 
// 排除cron和supercron网页 
 if (req.url ~ "cron.php") { 
  return (pass); 
 } 
 // exclude dynamic pages (as did Boost) 
// 排除动态网页（也是提高（处理）） 
 if (req.http.host ~ "domain.org" && req.url ~ "^/(user/login|user/password|user/register|logout|cart|post-blog|site-feedback|cgi-bin/webscr|redirect-home|cv-enroll|recommended-content|node/8755|node/8830|node/8351|node/8757|node/8831|cart/(.*)|uc_paypal/(.*)|civicrm/(.*)|admin/(.*)|recommended-content/(.*)|comment/reply/(.*)|node/add/(.*))" ) { 
  return (pass); 
 } 
 
 // exclude in case of Referer Theme 
// 排除Referer的一些主题 
 if (req.http.host ~ "domain.org" && req.http.referer ~ "www.christianvolunteering.org|worldvision.christianvolunteering.org|ccda.christianvolunteering.org|www.ccda.org|www.urbanresource.net|mobile.urbanministry.org|www.ministeriourbano.com") { 
  return (pass); 
 } 
 /* Rules to fix Moodle (thanks, gchaix!) */ 
// 修复Moodle规则 
  // Cache Moodle theme files 
//缓存Moodle主题文件 
  if (req.url ~ "/pix/.*\.gif$") { 
   return (lookup); 
  } 
 
  // Moodle doesn't like to be cached, passing 
//Moodle主题不能缓存的就pass 
  if (req.http.Cookie ~ "(MoodleSession|MoodleSessionTest)") { 
   return (pass); 
  } 
  if (req.http.host == "www.domain.edu" && req.url ~ "^/courses") { 
   return (pass); 
  } 
  if (req.url ~ "file.php") { 
   return (pass); 
  } 
 
  // WPMU themes are not playing well with static file caching 
//WPMU主题使用静态文件缓存运行的不太好 
  if (req.http.host == "domain.org" && req.url ~ "/blogs/(.*)/wp-content/themes") { 
   return (pass); 
  } 
 /* Rules for static file caching */ 
 /* 静态文件缓存规则 
 // static files get served by Lighttpd 
// 使用Lightted服务静态文件 
 if (req.http.host != "server2.techmission.org" && req.url ~ "\.(gif|jpg|swf|css|js|png|jpg|jpeg|gif|png|tiff|tif|svg|swf|ico|doc|ppt|pps|xls|odc|odb|odf|odg|odi|odp|ods|odt|sxc|sxd|sxi|sxw)$") { 
   // Lighttpd does not require cookies 
   unset req.http.Cookie; 
   unset req.http.Authorization; 
   set req.backend = lighttpd; 
 } 
 
 // large media files get piped directly to lighttpd, to avoid overfilling cache 
// 大媒体文件直接使用pipe方式到lightted，避免缓存溢出 
 if (req.url ~ "\.(mp3|mp4|m4a|ogg|mov|avi|wmv)$" && req.url !~ "audio/download") { 
  set req.backend = lighttpd; 
  pipe; 
 } 
 // pipe large media files that come from Drupal, also, but they can't go to lighty 
// pipe从Drupal过来的大媒体文件，同时不去lighty 
 if (req.url ~ "audio/play" || req.url ~ "audio/download") { 
  pipe; 
 } 
 
} 
sub vcl_hash { 
 if (req.http.Cookie) { 
  set req.hash += req.http.Cookie; 
 } 
 /* Have a separate object cache for mobile site based on User-Agent */ 
/* 基于User-Agent的移动网站有一个单独的对象缓存 
 if (req.http.host == "www.domain.org" && req.http.User-Agent ~ "(iPhone|iPod)") { 
  set req.hash += "mobile"; 
 } 
} 
sub vcl_fetch { 
 // Grace to allow varnish to serve content if backend is lagged 
// 如果backend滞后，允许varnish服务内容有一个缓冲期 
 set obj.grace = 5m; 
 
 // Add line showing what cookie is once stripped by