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litespeed_wiki:cache:lscache:purge [2015/08/03 18:49]
Michael Alegre [Create a wrapper script purge.php for PURGE] 		litespeed_wiki:cache:lscache:purge [2017/01/03 21:44]
Michael Alegre Added Redirect.
Line 1: Line 1:
-====== LSCache PURGE ====== +~~REDIRECT>litespeed_wiki:cache:no-plugin-advanced:purge~~
- +
-===== Summary ===== +
-As of 4.1.12, LSWS supports cache PURGE operation to accommodate the demand on cache manipulation. +
- +
-===== Procedures ===== +
-Here are the steps to PURGE cache: +
- +
- +
- +
- +
- +
- +
-==== Create a wrapper script purge.php for PURGE ==== +
- +
-<​code>​ +
-<?php +
-$fp = fsockopen('​192.168.0.81',​ 80, $errno, $errstr, 2); +
-if (!$fp) { +
-    echo "​$errstr ($errno)\n";​ +
-} else { +
-    $out = "PURGE /hello.php HTTP/​1.0\r\n"​ +
-    . "Host: www.example.com\r\n"​ +
-    //. "​Authorization:​ Basic "​.base64_encode("​userid:​password"​)."​\r\n"​ +
-    . "​Connection:​ Close\r\n\r\n";​ +
-    fwrite($fp, $out); +
-    echo $out; +
-    while (!feof($fp)) { +
-        echo fgets($fp, 128); +
-    } +
-    fclose($fp);​ +
-} +
-?> +
-</​code>​ +
- +
-**Note:​** ​  +
-  - We are using internal IP address 192.168.0.80 for illustration purposes only. In a real world application,​ make sure that vhost listens on 192.168.0.80 for domain name [[http://​example.com]]. +
-  - Authentication can be added to make the PURGE more secure. Comments in the script simplify the process. +
- +
- +
-==== Set up Rewrite Rules to Allow PURGE ==== +
- +
-put the following rules in .htaccess +
- +
-  RewriteEngine On +
-  RewriteCond %{REQUEST_METHOD} ^HEAD|GET|PURGE$ +
-  RewriteCond %{REQUEST_URI} !^/​purge\.php$ +
-  RewriteRule .* - [E=Cache-Control:​max-age=120,​L] +
- +
-**Note:** PURGE needs to be in the allowed method. +
- +
-=== Whitelist source IP to issue PURGE request ==== +
- +
-Admin Console => Configuration => Server => Security => Allow List +
- +
-append Source_IP with tailing '​T'​ for trusted IP like  'ALL, 192.168.0.81T'​ +
- +
- +
- +
-===== Operations ===== +
- +
- +
-==== 1. Create Cache ==== +
- +
- ​1.1 ​ point browser to [[http://​www.example.com/​hello.php]] +
- +
- ​1.2 ​ cache storage has a new file created for hello.php (for illustration purposes, we cleaned cache storage in our lab prior to step 1). +
-<​file>​ +
-[root@cptest diskcache]# ls -lrt */*/* +
-9/c/6: +
-total 12 +
--rw------- 1 nobody nobody 11638 May  2 15:42 9c6eae83978ecd87 +
- +
-[root@cptest diskcache]#​ +
-</​file>​ +
- +
-==== 2. Request the same resource from cache ==== +
- +
-  request http://​www.example.com/​hello.php again from browser. receive '​X-Litespeed-Cache:​ hit' response header as a prove  +
-<​file>​ +
-   Date: Wed, 02 May 2012 23:59:53 GMT +
-   ​Content-Encoding:​ gzip +
-   ​X-Litespeed-Cache:​ hit   <​=== here it is +
-   ​Connection:​ Keep-Alive +
-   ​Content-Length:​ 10 +
-   ​Server:​ LiteSpeed +
-   Vary: Accept-Encoding +
-   ​Content-Type:​ text/html +
-   ​Keep-Alive:​ timeout=5, max=100 +
-</​file>​ +
- +
- +
- +
-==== 3. Issue purge request from server ==== +
- +
- 3.1 1st time, '200 Purged'​ status returned. +
-<​file>​ +
-   ​[test@test ​~]$ php purge.php +
-   PURGE /hello.php HTTP/1.0 +
-   Host: www.example.com +
-   ​Connection:​ Close +
- +
-   ​HTTP/​1.0 200 Purged +
-   Date: Wed, 02 May 2012 23:48:23 GMT +
-   ​Server:​ LiteSpeed +
-   ​Connection:​ close +
- +
-   ​[test@test ​~]$  +
-</file> +
- +
-**Note:** '​HTTP/​1.0 200 Purged'​ indicates the resource is purged. +
- +
-Rewrite Log shown  +
-<​file>​ +
-2012-05-02 15:​43:​20.280 [INFO] [192.168.0.81:​60174-0#​APVH_lstest.com] [REWRITE] strip base: '/'​ from URI: '/​phpinfo.php'​ +
-2012-05-02 15:​43:​20.280 [INFO] [192.168.0.81:​60174-0#​APVH_lstest.com] [REWRITE] Rule: Match '​phpinfo.php'​ with pattern '​.*',​ result:  +
-1 +
-2012-05-02 15:​43:​20.280 [INFO] [192.168.0.81:​60174-0#​APVH_lstest.com] [REWRITE] Cond: Match '​PURGE'​ with pattern '​^HEAD|GET|PURGE$',​  +
-result: 1 +
-2012-05-02 15:​43:​20.280 [INFO] [192.168.0.81:​60174-0#​APVH_lstest.com] [REWRITE] Cond: Match '/​phpinfo.php'​ with pattern '​^/​purge\.php +
-$', result: -1 +
-2012-05-02 15:​43:​20.280 [INFO] [192.168.0.81:​60174-0#​APVH_lstest.com] [REWRITE] apply cache-control: '​max-age=120'​. +
-2012-05-02 15:​43:​20.280 [INFO] [192.168.0.81:​60174-0#​APVH_lstest.com] [REWRITE] No substition +
-2012-05-02 15:​43:​20.280 [INFO] [192.168.0.81:​60174-0#​APVH_lstest.com] [REWRITE] Last Rule, stop! +
-2012-05-02 15:​43:​20.281 [NOTICE] [192.168.0.81:​60174-0#​APVH_lstest.com:​cache] [PUBLIC CACHE] PURGE /​phpinfo.php,​ result: 1 +
-2012-05-02 15:​43:​20.281 [DEBUG] [192.168.0.81:​60174-0#​APVH_lstest.com:​cache] HttpConnection::​sendHttpError(),​code=200 Purged +
- +
- ... +
- +
-</​file>​ +
- +
- 3.2 2nd purge request results in 405 error +
- +
-<​file>​ +
-   ​[test@test ~]$ php purge.php +
-   PURGE /hello.php HTTP/1.0 +
-   Host: www.lstest.com +
-   ​Connection:​ Close +
- +
-   ​HTTP/​1.0 405 Method Not Allowed +
-   Date: Wed, 02 May 2012 23:37:44 GMT +
-   ​Server:​ LiteSpeed +
-   ​Connection:​ close +
-   ​Cache-Control: private, ​no-cache, max-age=0 +
-   ​Pragma: no-cache +
-   ​Content-Type:​ text/html +
-   ​Content-Length:​ 383 +
- +
-   ​[test@test ~]$ +
-</​file>​ +
- +
-Rewrite Log shown +
-<​file>​ +
-2012-05-02 15:​43:​39.588 [NOTICE] [192.168.0.81:​60175-0#​APVH_lstest.com] Content len: 0, Request line: 'PURGE /​phpinfo.php HTTP/​1.1'​ +
-2012-05-02 15:​43:​39.588 [DEBUG] [192.168.0.81:​60175-0#​APVH_lstest.com] Find context with URI: [/], location: [/​home/​lstestc/​public_html/​] +
-... +
-2012-05-02 15:​43:​39.588 [INFO] [192.168.0.81:​60175-0#​APVH_lstest.com] [REWRITE] strip base: '/'​ from URI: '/​phpinfo.php'​ +
-2012-05-02 15:​43:​39.588 [INFO] [192.168.0.81:​60175-0#​APVH_lstest.com] [REWRITE] Rule: Match '​phpinfo.php'​ with pattern '​.*',​ result: 1 +
-2012-05-02 15:​43:​39.588 [INFO] [192.168.0.81:​60175-0#​APVH_lstest.com] [REWRITE] Cond: Match '​PURGE'​ with pattern '​^HEAD|GET|PURGE$',​ result: 1 +
-2012-05-02 15:​43:​39.588 [INFO] [192.168.0.81:​60175-0#​APVH_lstest.com] [REWRITE] Cond: Match '/​phpinfo.php'​ with pattern '^/purge\.php$',​ result: -1 +
-2012-05-02 15:​43:​39.588 [INFO] [192.168.0.81:​60175-0#​APVH_lstest.com] [REWRITE] apply cache-control:​ '​max-age=120'​. +
-2012-05-02 15:​43:​39.588 [INFO] [192.168.0.81:​60175-0#​APVH_lstest.com] [REWRITE] No substition +
-2012-05-02 15:​43:​39.588 [INFO] [192.168.0.81:​60175-0#​APVH_lstest.com] [REWRITE] Last Rule, stop! +
-2012-05-02 15:​43:​39.588 [DEBUG] [192.168.0.81:​60175-0#​APVH_lstest.com] HttpConnection::​sendHttpError(),​code=405 Method Not Allowed +
-2012-05-02 15:​43:​39.588 [DEBUG] [192.168.0.81:​60175-0#​APVH_lstest.com] redirect to:  +
-        URI=[/​405.shtml],​ +
-        QueryString=[] +
-</​file>​ +
- +
-==== 4. Verify cache is purged ==== +
- +
- 4.1 check cache file -- gone +
-<​file>​ +
-   ​[test@test ​~]$ ls -lrt */*/* +
- +
-   ​9/​c/​6:​ +
-   total 0 +
-   ​[test@test ​~]$  +
-</​file>​ +
- +
- 4.2 request resource 3rd time from browser, *no* '​X-Litespeed-Cache:​ hit' response header received. +
-<​file>​ +
-   Date: Wed, 02 May 2012 23:42:18 GMT +
-   ​Content-Encoding:​ gzip +
-   ​Transfer-Encoding:​ Identity +
-   ​Connection:​ close +
-   ​Server:​ LiteSpeed +
-   Vary: Accept-Encoding +
-   ​Content-Type:​ text/html +
-</​file>​+
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  • Last modified: 2017/01/03 21:44
  • by Michael Alegre