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gzip_cnc Cache Bedingte Zugriffe Programmlogik Programm Status-Codes Protokoll Wirkung Installation Sicherheit Projekt

Inhaltsverzeichnis

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Table of contents

• gzip_cnc - an Apache handler for serving compressed content
  • What is this all about?
  • Why gzip_cnc - there is mod_gzip already?
  • Which requests can be compressed by gzip_cnc?
  • Which file types can be handled by gzip_cnc?
  • Am I able to use gzip_cnc for my web space?
  • How much additional load will the use of gzip_cnc put on the server?
  • How much additional disk space will gzip_cnc's cache use on the server?
• The cache model of gzip_cnc
  • Objective
  • Compressed variants of static documents
  • Maintaining the compressed variants
  • Automatisation
  • Repository for the compressed document variants
  • Directories and URLs
  • Potential improvements
• The processing logic of gzip_cnc
  • Order of the main program's operation
  • Creating (or updating the content of) a cache file
  • Serving a file content
  • Processing for a missing page
  • Termination processing
• The gzip_cnc program
  • License agreement for gzip_cnc
  • Source code of gzip_cnc
• gzip_cnc status codes
  • Status codes numbering
  • Serving a content from the cache
  • Serving the content from the original file
  • Execution errors
  • Self test mode
• The logging function of gzip_cnc
  • Writing messages
  • Log file format
  • Log file evaluation
• Savings by serving compressed data
  • Introduction
  • An example for a traffic analysis
  • Obtainable gains
  • Comparing the efficiency to mod_gzip
  • Other document types than HTML
  • Coping with dynamic HTML pages
  • Coping with JavaScript and Cascading Style Sheets
  • Browser handling of cache files
• Installation and configuration of gzip_cnc
  • Configuration
    • Specifying the compression level
    • Specifying the path for the compression program gzip
    • Specifying the root directory for the cache tree
    • Specifying gzip_cnc's own log file
    • Specifying the error document to be used
    • Specifying the MIME type to be served
    • Sending gzip_cnc's own HTTP headers
    • Activating the self test mode
    • Submitting a browser cache validity interval
    • Configuration via Environment variables
  • Installation of the program as CGI script
  • Self test of the CGI script
  • gzip_cnc activation
    • Embedding the handler
    • Coexistance of gzip_cnc and Server Side Includes
  • Testing the installation
• Security aspects when using gzip_cnc
  • The CGI interface for an Apache handler
  • The problem with gzip_cnc 1.10 and earlier versions
  • Detecting a direct access by gzip_cnc
  • Doublechecking gzip_cnc's the access check by the user
• Project management
  • Version history of gzip_cnc
  • Known problems
  • Possible enhancements for future versions
  • Credits

(Michael Schröpl, 2002-09-08)