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--- litespeed_wiki:litespeed:cache:purge [2015/04/20 18:29]
Serge Espitia
+++ — (current)
@@ Line 1: / Line 1: @@
-====== LSWS Cache 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 [[www.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  point browser to [[http://www.example.com/hello.php]]
-.2  cache storage has a new file created for hello.php (for illustration, we clean cache storage in our lab prior to step 1).
-<file>
-[root@cptest diskcache]# ls -lrt */*/*
-/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 ====
-.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>
--05-02 15:43:20.280 [INFO] [192.168.0.81:60174-0#APVH_lstest.com] [REWRITE] strip base: '/' from URI: '/phpinfo.php'
--05-02 15:43:20.280 [INFO] [192.168.0.81:60174-0#APVH_lstest.com] [REWRITE] Rule: Match 'phpinfo.php' with pattern '.*', result:
--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$',
-result: 1
--05-02 15:43:20.280 [INFO] [192.168.0.81:60174-0#APVH_lstest.com] [REWRITE] Cond: Match '/phpinfo.php' with pattern '^/purge\.php
-$', result: -1
--05-02 15:43:20.280 [INFO] [192.168.0.81:60174-0#APVH_lstest.com] [REWRITE] apply cache-control: 'max-age=120'.
--05-02 15:43:20.280 [INFO] [192.168.0.81:60174-0#APVH_lstest.com] [REWRITE] No substition
--05-02 15:43:20.280 [INFO] [192.168.0.81:60174-0#APVH_lstest.com] [REWRITE] Last Rule, stop!
--05-02 15:43:20.281 [NOTICE] [192.168.0.81:60174-0#APVH_lstest.com:cache] [PUBLIC CACHE] PURGE /phpinfo.php, result: 1
--05-02 15:43:20.281 [DEBUG] [192.168.0.81:60174-0#APVH_lstest.com:cache] HttpConnection::sendHttpError(),code=200 Purged
- ...
-</file>
-.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>
--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'
--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/]
-...
--05-02 15:43:39.588 [INFO] [192.168.0.81:60175-0#APVH_lstest.com] [REWRITE] strip base: '/' from URI: '/phpinfo.php'
--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
--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$', result: 1
--05-02 15:43:39.588 [INFO] [192.168.0.81:60175-0#APVH_lstest.com] [REWRITE] Cond: Match '/phpinfo.php' with pattern '^/purge\.php$', result: -1
--05-02 15:43:39.588 [INFO] [192.168.0.81:60175-0#APVH_lstest.com] [REWRITE] apply cache-control: 'max-age=120'.
--05-02 15:43:39.588 [INFO] [192.168.0.81:60175-0#APVH_lstest.com] [REWRITE] No substition
--05-02 15:43:39.588 [INFO] [192.168.0.81:60175-0#APVH_lstest.com] [REWRITE] Last Rule, stop!
--05-02 15:43:39.588 [DEBUG] [192.168.0.81:60175-0#APVH_lstest.com] HttpConnection::sendHttpError(),code=405 Method Not Allowed
--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 ====
-.1 check cache file -- gone
-<file>
-   [test@test ~]$ ls -lrt */*/*
-/c/6:
-   total 0
-   [test@test ~]$
-</file>
-.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>