Cache is the king
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Cache can be our best friend or our worst enemy, that is why understanding this issue is so important . Good cache configuration can easily improve user web experience.
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Cache is the king
- 4. (start line) GET /BUILD/ASSETS/IMAGES/LOGO.PNG HTTP/1.1 HOST: WWW.EDRONE.ME 80 http://edrone.me/build/assets/images/logo.png
- 6. Request message [method] [url] [version] [headers] [body]
- 7. Full request GET / HTTP/1.1 Host: server.com Connection: keep-alive User-Agent: Mozilla/5.0(Windows NT 6.1; WOW64) Chrome/16.0.912.75 Safari/535.7 Accept : text/html, application/xhtml+xml,application/xml;=0.9,*/*;q=0.8 Referer : http://www.google.com/url?&q=edrone Accept-Encoding: gzip,deflate,sdch Accept-Language: en-US,en;q=0.8 Accept-Charset: ISO-8859-1,uft-8;q=0.7,*;q=0.3
- 8. Response message [version] [status] [reason] [headers] [body]
- 9. Full response HTTP/1.1 200 OK Cache-Control: private Content-Type: text/html, charset=utf-8 Server: Microsoft-IIS/7.0 X-AspNet-Version: 2.0.50727 X-Powered-By: ASP.NET Date: Sat, 14 Feb 2003 04:00:08 GMT Content-Lenght:17151 <html> ...content </html>
- 10. Status codes categories Range •100-199 •200-299 •300-399 •400-499 •500-599 Category •Informational •Successful •Redirection •Client Error •Server Error
- 11. Popular one’s Code/Reason •200/OK •301/Moved Permanently •302/Moved Temporaily •304/Not Modifed •400/Bad Request •401/Unauthoized •403/Forbidden •404/Not found •500/Internal Server Error •503/Service Unavailable Description •Success! •Resource moved,don’t check here again •Resource moved, but check here again •Resource hasn’t changed since last retrival •Bad syntax? •Client might need to authenticate •Refused access •Resource doesn’t exist •Something went wrong during processing •Server will not recive the request
- 12. Cache-Control
- 15. Conditional request headers •Expect •If-Match •If-Modified-Since •If-None-Match •If-Range •If-Unmodified-Since •Range •Allows client to list server behaviors that it requires for a request •Gets the document if the entity tag matches the current entity tag for the document •Restricts the request unless the resources has been modified since the specified date •Gets the document if the entity tags supplied do not match those of the current document •Allows a conditional request for a range of a document •Restricts the request unless the resource has not been modified since the specified date •Request a specific range of a resource, if the server support range request
- 16. Apache modules mod_expires •ExpiresActive On •ExpiresByType image/jpg "access plus 1 year" •ExpiresByType image/jpeg "access plus 1 year„ •ExpiresByType text/css "access plus 1 month„ •ExpiresByType application/pdf "access plus 1 month" •ExpiresByType text/x-javascript "access plus 1 month" •ExpiresByType application/x-shockwave-flash "access plus 1 month" •ExpiresByType image/x-icon "access plus 1 year„ •ExpiresDefault "access plus 2 days" mod_headers •<Files *.php> •Header set Cache-Control public,max-age=3600 </Files> •<Files *.xml> •Header set Cache-Control "no-cache, no-store, must- revalidate, max-age=0" •</Files>
- 17. Thank You!