Lab Exercises in VS .NET

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Lab Exercises
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The following exercises will take you through the steps of installing mod_proxy, configuring httpd, and configuring the client
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Installing mod_proxy
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The mod_proxy module is required for Apache to run on a proxy server The following steps show you how to install mod_proxy 1 Make sure that Apache has loadable module support compiled in From the command prompt, type:
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httpd -l
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2 This will list all currently loaded modules If mod_so is not listed, Apache must be recompiled to include it If mod_proxy was listed, there is no need to complete the rest of this section Skip to the next section 3 Compile the mod_proxy module according to the instructions included with the distribution of Apache mod_proxy is part of the base Apache distribution and is included with the Apache source 4 To have mod_proxy loaded every time Apache is started, use the LoadModule directive First, open httpdconf with a text editor, and add the following in the Global Environment Section:
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LoadModule mod_proxy path/to/mod_proxyso
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Configuring httpd
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This section shows you how to enable the proxy server 1 Locate the proxy directives in the httpdconf file that came with Apache Uncomment the lines that configure the proxy, and add any
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Lab VII
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site-specific configurations In order for Apache to proxy, the directive ProxyRequests On must be present before the other mod_proxy directives ProxyPass is the only directive that does not require ProxyRequests 2 Implement the caching abilities of mod_proxy by using the directives CacheRoot and CacheSize The value of CacheRoot must be set before Apache will cache HTTP data:
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CacheRoot "/var/cache/http/"
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Also, make sure that httpd has write permissions for this directory 3 Restart httpd
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Configuring the Client
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Configure the user-end client (Netscape) to use the proxy server, using the following steps 1 2 3 4 On the client machine, open Netscape From Edit>Preferences, select Advanced>Proxies Click Manual proxy configuration, and then click view In the HTTP proxy field, type the host name and port number that the proxy uses
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Questions
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1 If a company runs an intranet and uses the intranet server as the proxying firewall, which directive should be used so the server will not proxy intranet requests 2 How can modules be integrated into Apache 3 If the directives ProxyRequests Off and ProxyPass are both present in httpdconf, what will occur
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Configuration of a Proxy
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Answers
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1 The NoProxy directive will make a proxy server handle specified requests, instead of proxying the request 2 Apache can be recompiled to include the module, or if Apache has DSO support, the module can be inserted with the LoadModule directive 3 The ProxyPass directive will function properly because it does not require ProxyRequests
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Advanced Questions
1 How can Apache be set up to proxy FTP requests 2 How can mod_proxy directives be included only on the condition that mod_proxy is loaded 3 How can Lynx be configured to use the Apache proxy
VIII
URL Rewriting
Purpose
The lab will teach students the basics of URL rewriting, using Apache s URL rewriting engine Students will attempt two tasks involving mod_rewrite: rewriting a URL to point to a different Web server and rewriting a URL to a different file based on browser type
Theory
Apache has a powerful tool to redirect certain URLs based on pattern matching The method that Apache uses to redirect URLs is to rewrite the URL sent to the server with the URL to which the client should be redirected This is useful because it provides backward compatibility for outdated URLs To be able to rewrite URLs, the server must have mod_rewrite installed and have appropriate patterns for the RewriteRule directive to match mod_rewrite comes with several directives that can be used to rewrite URLs Several important mod_rewrite directives are listed in Table VIII1
Lab VIII Table VIII1 mod_rewrite Directives DESCRI PTION Enables URL rewriting Sets the rewriting log file Determines the logging level Provides conditionality of rewriting Specifies actual rewriting rules