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Blocking robots
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It s easy to block an annoying Web spider program (also called robots) from retrieving pages of a specific Web site You might try a /robotstxt file containing entries of the Robot Exclusion Protocol, but that is typically not enough to get rid of such a robot A sample solution is:
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RewriteCond %{HTTP_USER_AGENT} ^NameOfBadRobot* RewriteCond %{REMOTE_ADDR} ^123\45\67\[8 9]$ RewriteRule ^/not/to/be/indexed/by/robots/+ [F]
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This rule has two conditions:
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If (HTTP_USER_AGENT of the robot matches a pattern NameOfBadRobot ) and (REMOTE_ADDR of the requesting host is 12345678 to 12345679) then No substitution but send a HTTP Forbidden header (status code 403) endif
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Part II Web Site Administration
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As you can see, the robot s User-Agent header is matched, along with the IP address of the host it uses The above conditions allow for multiple IP addresses (12345678 and 12345679) to be checked
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Creating an HTTP referer-based URL deflector
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You can program a flexible URL deflector that acts on the Referer HTTP header and configure it with as many referring pages as you like Here s how:
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RewriteMap deflector txt:/path/to/deflectormap RewriteRule ^/(*) ${deflector:%{HTTP_REFERER}|/$1} RewriteRule ^/DEFLECTED %{HTTP_REFERER} [R,L] RewriteRule * - [PT]
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This is used in conjunction with a corresponding rewrite map such as the following:
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http://wwwbadguyscom/bad/indexhtml http://wwwbadguyscom/bad/index2html http://wwwbadguyscom/bad/index3html DEFLECTED DEFLECTED http://somewherecom/
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This automatically redirects the request back to the referring page if the URL matches the DEFLECTED value in the map file In all other cases, the requests are redirected to specified URLs
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Setting up a Proxy Server
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proxy server is a system that sits between the client hosts and the servers that they need access to When a client host requests a certain remote resource using a URL, the proxy server receives this request and fetches the resource to fulfill the client s request In a general sense, a proxy server acts like a server to the client hosts and a client to the remote servers In typical proxy scenarios, this process enables the proxy server to store the requested content in a cache Any new request that asks for information already in the cache no longer needs to be serviced by fetching it from the remote server Instead, the new request is serviced from the cached data This allows proxy servers to ease network bottlenecks However, this is not all that a proxy server does This chapter teaches you to turn Apache into a proxy server that can perform a multitude of services You learn how to turn Apache into a caching (forward) proxy server Deploying such a server at the network bottleneck can reduce delays in response times, conserve bandwidth, and help reduce your overall communications expense Because proxy is usually used for networks with large user communities, I also cover various aspects of client configuration including automatic proxy configuration
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C H A P T E R
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In This
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Understanding types of proxy servers Configuring Apache as a proxy server Setting up Web browsers for proxy
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Who Should Use a Proxy Server
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The purpose of this proxy server is to fetch the requested resource from the remote server, return it to the requesting user, and cache it in local drives Proxy service is ideal for scenarios in which more than one user is accessing the network Many organizations have several host computers that access the Internet via a single Internet connection such as an ISDN router or other dedicated or on-demand connection A proxy can be very helpful in such a network
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You can gain the following benefits by using a proxy for both Internet and intranet resources: Proxying: If the internal network uses nonroutable IP addresses for either security or cost reasons, you can use a proxy server to provide Internet resources to hosts that normally cannot access the Internet This chapter teaches you how to do this Caching: Using a caching proxy such as Apache (with mod_perl), you can provide seemingly faster access to Internet resources to the local users This will not only enhance the user s perception of network performance but also cut down on bandwidth usage costs Logging and Access Control: By using a proxy server, you can monitor Internet (or even intranet) usage by employees or students You can block access to certain Web sites to protect your company from potential lawsuits, and you can stop abuse of company time By analyzing your proxy server s access and error logs, you can identify usage patterns and make better network usage policy in future