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Training, Open Source Programming Languages |
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| For 2023 (and 2024 ...) - we are now fully retired from IT training. We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk. Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active! I am also active in many other area and still look after a lot of web sites - you can find an index ((here)) |
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Etag in http headers - what is it?
If you've ever looked at the headers you receive back from your web server, you may have noticed an Etag. What is it? An Etag is an "entity tag" and it provides a unique identifier for the resource being supplied. Browser requests can use an etag and an if-match header to check whether a resource has been modified since it was served, providing an efficient caching facility that relies on content rather than on timeouts. (written 2007-10-03) Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles A207 - Web Application Deployment - HTTP[484] Setting the file name for a downloaded document - (2005-11-03) [1503] Web page (http) error status 405 - (2008-01-12) [1549] http, https and ajp - comparison and choice - (2008-02-22) [2321] Uploading and Downloading files - changing names (Perl and PHP) - (2009-08-04) [2596] Http protocol - what does a web server send - (2010-01-24) [2738] What is all this SESSION stuff about? (PHP) - (2010-04-25) [2918] Downloading a report from the web for further local analysis - (2010-08-13) [3432] 3 digit HTTP status codes - what are they, which are most common, which should be a concern? - (2011-09-11)
Some other Articles
First Great Western - information for customersUsing a MySQL database to control mod_rewrite via PHP Static variables in PHP Simple page password protection - PHP Etag in http headers - what is it? Load Balancing with Apache mod_jk (httpd/Tomcat) Choosing between mod_proxy and mod_rewrite Python v Ruby Maidenhead Coffee Challenge New Month, New Quarter, New Laws |
4759 posts, page by page
Link to page ... 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96 at 50 posts per pageThis is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.
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