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| About site: Internet/Proxying and Filtering/Caching - Mnot.net: Cacheability Engine |
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| About site: http://www.mnot.net/cacheability/ |
Title: Internet/Proxying and Filtering/Caching - Mnot.net: Cacheability Engine Tool for assessing how cacheable a given piece of content is. Available as a online service or as software.
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Cacheability Engine Cacheability EngineTo help you understand how Web Caches will treat a Webpage, the Cacheability Engine will look at a URL (and optionally any imagesor objects associated with it), giving both specific cache-related data aboutit, and a general commentary on how cacheable the object is.Remember, however, that it can't tell you everything about how cacheableyour page is; it can only help you make an informed decision about yoursite.For more information about cacheability, see the Tutorial.The Cacheability Engine is free to use; see the bottom of this page formore information.how do I use it?The Engine can be accessed in a few ways;1. as a public web EngineThe following sites host public copies: IRCache [host site] web-caching.com [host site]If you'd like to make your own public page available, please contact me.2. as an extension to your Web browserBy installing a browser extension, you can check any page's cacheabilityas you're surfing, with a single click. See the public Engine pages for moredetails.3. by installing it locallyIf you'll be using the Engine often, you can download it and install it on a computer of yourchoice. Once it's there, you can use it as a CGI script or a command-lineutility. See the README file included for details.how do I interpret the results?The output of the Engine takes the form of a cascading list of objects. Inthe Web interface, the color of the list dot indicates how cachable theobject is; a red dot is very uncacheable, a yellow one somewhat cacheable,and a green dot is quite cacheable. You can click on the object's URL to opena window to look at it.Under the URL is a list of different HTTP headers and their values. Forinformation about what each does, read the Tutorial.If the object has a Last-Modified header, information about whether itsupports validation will be written on that line. If the object has avalidator, but returns a full response to a conditional request with the sameobject as before, the script will write "Validation not Supported".Finally, each object will have a paragraph of commentary associated, whichwill point out the various ways which it will interact with a cache. For moreinformation about the concepts involved, see the Tutorial.In the Web interface, the object list will be followed by a list of linksthat were referenced by the URL. You can check the cacheability of each ofthese by following the links there.Date headers and clock skewIn the course of using the Engine, you may get messages (either at the topof the Web interface, or in the commentary) about Date headers and clockskew. Breifly, if the clock of a Web server is inaccurate, it can causeproblems with Caching, which is very date-dependant. If you get this message,you should synchronise the clock on the Web server; ask your SystemAdministrator, or see www.ntp.org for more information.If you see a message that the Web server didn't generate Date headers whenit should have, you have a buggy Web server, and should upgrade.limitationsWhile the Engine does its best to show you everything that may affect anobject's cacheability, there are some things it can't do. appropriate freshness - The Engine does not suggest freshness values for objects; it only reports whether they are available. Only you can determine the proper values. displayed values - The date and other values displayed are parsed and reformatted; if you need to see the actual values served, look at the server output directly. authentication - HTTP authentication can't be entered yet. Note that it would never be a good idea to allow input of authentication information on a public service. cookies - The effects of cookies set from pages that aren't part of the query can't be gauged. Keep in mind that if a cookie is set to be sent for a directory/server combination that matches the object, it will be requested on every reference. accelerators and transparent proxies - If one of these devices is between the Engine and the Web server, it can have unpredictable effects, particularly on date-related fields and calculations (possibly including validation). Web server farms - If your site is served by a farm of servers, the Engine may get responses for different objects from different servers. This normally isn't a problem, unless the servers' contents, software version or clocks are out of sync. proxies and dates - Alhthough the script can be configured to use a proxy, it is not recommended for the same reasons as above. If you must use one, use a tunnel (a proxy that doesn't modify or cache the connection). object types - Finally, some object types aren't fetched by the Engine upon reference, and will need to be checked directly. These include Java applets, imagemaps (client and server side) and URLs in Javascript or DHTML. HTML and JavaScript refresh/redirect tags - Some Web sites use META tags and/or JavaScript to redirect users to another page, rather than using HTTP redirect headers. Because there are a variety of ways that this can happen, the Engine can't automatically handle them. You'll have to go to their destinations manually.In general, the Engine is only a tool that gives you an indication ofcacheability. You'll get the best results from it when you understand theimplications of caching your content and develop a plan to determine howcacheable it should be.detailscontactTo ask questions, report bugs or make comments, please use this form.technicalThe Cacheability Engine is written in Python, a high-level, object orientedscripting language. Python runs on almost any platform, and is availablefreely at the link above.legalThe Cacheability Engine, both as a service and a program, is provided 'asis', without warranty of any kind. Although it is believed that it functionsas intended, it should only be thought of as an instrument that gives anindication of how caches may interact with a particular Web site.Although the Engine may be copied and distributed freely, it maynot be modified in any way (including the URL references that itcontains). This is to protect the end users; much care has been taken toassure that it returns the best possible results. This restriction applies toboth public Engines and redistribution of the software.If you would like to produce a derivative work (whether free orcommercial), please contact the author to discuss the project. |
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Tool | for | assessing | how | cacheable | a | given | piece | of | content | is. | Available | as | a | online | service | or | as | software. |
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http://www.mnot.net/cacheability/
Mnot.net: Cacheability Engine 2008 September
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Tool for assessing how cacheable a given piece of content is. Available as a online service or as software.
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