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--- doc:appunti:linux:sa:proxy_debug [2011/09/15 15:50] – created niccolo
+++ doc:appunti:linux:sa:proxy_debug [2011/09/15 17:45] (current) – niccolo
@@ Line 1: / Line 1: @@
-====== Substitute HTML or JavaScript with a proxy ======
+====== Substitute HTML or JavaScript on the fly ======
-===== How to test changes to a live site without touching it =====
+Using this recipe - while browsing a remote server - you can trick your browser into taking one file (JavaScript, HTML, image, ecc.) from a web server controlled by you, instead of from the original server.
+This can be useful to test some changes on a production server without actually touching the deployed code.
+It works by telling the browser to use a proxy for a particular URL, and configure a fake web server to serve that content, eventually canged.
 Create a file **''proxy.pac''** and store it into your web server:
@@ Line 8: / Line 12: @@
 function FindProxyForURL(url, host) {
     if (shExpMatch(url, "http://remote.server.com:8084/subdir/page.jsp?query_string")) {
-        return "PROXY your.server.org:8080";
+        return "PROXY your.server.org:8084";
     }
 }
 </code>
-Configure the fake VirtualHost on your web server:
+Configure a fake ''VirtualHost'' on your web server:
 <file>
+NameVirtualHost *:8084
+Listen 8084
+<VirtualHost *:8084>
+    ServerName remote.server.com
+    DocumentRoot /var/www/remote.server.com
+    ServerAdmin webmaster@rigacci.org
+    ErrorLog /var/log/apache2/remote.server.com/error.log
+    CustomLog /var/log/apache2/remote.server.com/access.log combined
+    # Force .jsp to be served as HTML
+    AddType text/html .jsp
+    <Directory /var/www/remote.server.com>
+        AllowOverride All
+    </Directory>
+</VirtualHost>
 </file>
-The put the fake file into the DocumentRoot fo the VirtaulHost **''/var/www/remote.server.com/subdir/page.jsp''**.
+Then put the fake file into the DocumentRoot for the VirtaulHost. In the example above it will be **''/var/www/remote.server.com/subdir/page.jsp''**.
+Configure the browser to use automatic proxy configuration, and give **''%%http://your.server.org/proxy.pac%%''** as the URL.
-Configure the browser to use automatic proxy, and give **''%%http://your.server.org/proxy.pac%%''** as the URL.
+**NOTE:** This trick **does not work with Internet Explorer**, because it caches the proxy configuration on a per-server basis. If one page from the server was got via proxy, all the subsequent pages will be too.