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| − | =30 March 2007=
| + | [[+Sven/30 March 2007]] |
| − | Topics:
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| − | ==[[W:Client-server|Client Server]] model==
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| − | How a client side [[W:Web browser|web browser]] interacts with a [[W:Web server|web server]]. See http://web-sniffer.net for an example of how http headers interact
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| − | between the server and client. The [[W:Apache HTTP Server|Apache HTTP Server]] uses a listener process on [[W:Hypertext Transfer Protocol|port 80]] (and ports 21, 443)
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| − | to communicate with the client using the [[W:Transmission Control Protocol|Transmission Control Protocol]] [[W:Internet protocol suite|TCP/IP]]. The listener uses [[W:Thread (computer science)|threads]] to [[W:Fork (operating system)|fork]] child processes as client requests demand content from the web server.
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| − | Client browsers allow [[W:Cache|caching]] of downloaded web content to save on bandwidth. The browser uses HTTP Response Header information to determine if a cached or new copy of the body of the web content needs to be transmitted to the client browser. The crital part in the HTTP Response Header are the fields;
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| − | <table class=document-code><tr><td>
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| − | Cache-Control: no-cache (completely dynamic), no-store, max-age=0 (check header everytime), must-revalidate
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| − | Date: Fri, 30 Mar 2007 09:11:02 GMT
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| − | </table>
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| − | GET and POST requests are essentially similar, they differ in the amount of content that can be transfered, GET requests are restricted to 4Kb. An analogy in the context of an email message, is that a GET request is like all the information being in the subject line, and a POST request is like an email attachment.
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| − | ===See also===
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| − | *[[Daemonise.pl]]
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| − | *[[Server.pl]]
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| − | *[[LiveTemplates]]
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| − | *[[W:Rewrite_engine|Mod rewrite engine]]
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| − | ==[[W:Debugging|Debugging]]==
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| − | There are three ways to debug, use print and echo statements to print [[W:Input/output|I/O]] to [[W:Standard streams|STDOUT]], use debugging software available within a program, and use functions which create log files of content at specific points of execution.
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| − | ==How Mediawiki works==
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