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Concept
Rewrite engine
Summary
In web applications, a rewrite engine is a software component that performs rewriting on URLs (Uniform Resource Locators), modifying their appearance. This modification is called URL rewriting. It is a way of implementing URL mapping or routing within a web application. The engine is typically a component of a web server or web application framework. Rewritten URLs (sometimes known as short, pretty or fancy URLs, search engine friendly - SEF URLs, or slugs) are used to provide shorter and more relevant-looking links to web pages. The technique adds a layer of abstraction between the files used to generate a web page and the URL that is presented to the outside world.
Semantic URL and URL shortening
Web sites with dynamic content can use URLs that generate pages from the server using query string parameters. These are often rewritten to resemble URLs for static pages on a site with a subdirectory hierarchy. For example, the URL to a wiki page with title Rewrite_engine might be:
http://example.com/w/index.php?title=Rewrite_engine
but can be rewritten as:
http://example.com/wiki/Rewrite_engine
A blog might have a URL that encodes the dates of each entry:
http://www.example.com/Blog/Posts.php?Year=2006&Month=12&Day=19
It can be altered like this:
http://www.example.com/Blog/2006/12/19/
which also allows the user to change the URL to see all postings available in December, simply by removing the text encoding the day '19', as though navigating "up" a directory:
http://www.example.com/Blog/2006/12/
A site can pass specialized terms from the URL to its search engine as a search term. This would allow users to search directly from their browser. For example, the URL as entered into the browser's location bar:
http://example.com/search term
Will be urlencoded by the browser before it makes the HTTP request. The server could rewrite this to:
http://example.com/search.php?q=search%20term
There are several benefits to using URL rewriting:
The links are "cleaner" and more descriptive, improving their "friendliness" to both users and search engines.
Official source
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