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July 27, It can also be the source of near-unending misery and suffering. Definitely worth playing carefully with it — lots of testing is recommended. With great power comes great responsibility, and all that.
There are several other guides on the web already, that may suit your needs better than this one. A basic grasp of the concept of regular expressions would also be very helpful. Most dynamic sites include variables in their URLs that tell the site what information to show the user.
Typically, this gives URLs like the following, telling the relevant script on a site to load product number 7. Search engines and users alike get no useful information about the content of a page from that URL. Compare that to this URL: But we can do more: Search engines can split that URL into words hyphens in URLs are treated as spaces by search engines, whereas underscores are notand they can use that information to better determine the content of the page.
Unfortunately, the last URL cannot be easily understood by a server without some work on our part.
When a request is made for that URL, the server needs to work out how to process that URL so that it knows what to send back to the user. Platforms and Tools Depending on the software your server is running, you may already have access to URL rewriting modules.
If not, most hosts will enable or install the relevant modules for you if you ask them very nicely. Apache is the easiest system to get URL rewriting running on.
We have a website, and we have a single PHP script that serves a single page. There may already be an. We use this file to perform 2 simple tasks in this instance — first, to tell Apache to turn on the rewrite engine, and second, to tell apache what rewriting rule we want it to use.
We need to add the following to the file: The line can be broken down into 5 parts: The server will check the URL of every request to the site to see if this pattern matches. Your existing URLs look like this: Effectively you want to change URLs of this format: These are patterns, defined in a specific format that the server can understand and handle appropriately.
A typical pattern to identify a number would look like this: You can have lots of backreferences, and they are numbered in the order they appear. And so, this RewriteRule will now mean that Apache redirects all requests for domain.
Regular Expressions A complete guide to regular expressions is rather beyond the scope of this article. The most instance of this is when people use a period in their pattern.
Time for another example — we wanted earlier to be able to indentify this URL and rewrite it: That rule will now match anything in the parrots directory or any other directory whose name is comprised of at least one or more letters and hyphens.
Flags Flags are added to the end of a rewrite rule to tell Apache how to interpret and handle the rule.
They can be used to tell apache to treat the rule as case-insensitive, to stop processing rules if the current one matches, or a variety of other options. They are comma-separated, and contained in square brackets.
Either an absolute or a relative URL can be given in the substitution section. The header sent back includea a code — — that indicates the move is temporary. This is one of the most common methods of rewriting URLs of items that have moved to a new URL for example, it is in use extensively on this site to forward users to new post URLs whenever they are changed.
Conditions Rewrite rules can be preceded by one or more rewrite conditions, and these can be strung together. This can allow you to only apply certain rules to a subset of requests. Personally, I use this most often when applying rules to a subdomain or alternative domain as rewrite conditions can be run against a variety of criteria, not just the URL.
Without the condition, this rule would create a loop, with every request matching that rule and being sent back to itself.The» Apache Documentation is the most authoritative source of information on the Apache 2.x server.
More information about installation options for Apache may be found there. The most recent version of Apache HTTP Server may be obtained from» Apache download site, and a fitting PHP version from the above mentioned benjaminpohle.com quick guide covers only the basics to get started with Apache 2.
The ISAPI redirector with version can perform log rotation, with configuration and behaviour similar to the rotatelogs program provided with Apache HTTP Server. To configure log rotation, configure a log_file, and one of the log_rotationtime or log_filesize options. The vulnerability exists because the mod_isapi module improperly unloads the benjaminpohle.com component on the Windows platform when processing malformed HTTP requests.
An unauthenticated, remote attacker could exploit this vulnerability by submitting a malicious HTTP request followed by a reset request.
|Your Answer||Name[ edit ] A number of explanations for the origin of the Apache name have been offered over the years. From the inception of the Apache project in the official documentation stated   Apache is a cute name which stuck.|
|B (escape backreferences)||It uses intelligent configuration cache mechanism.|
|Middleware Administration : Apache URL rewriting||Unfortunately this issue has not been very well understood by the media and has received a unwarranted amount of attention.|
|Apache compatible URL rewriting for IIS||After that URL is completely replaced by a Substitution and rewriting process continues until the end of configuration file or a rule with any of the stop flags. Special string '-' dash in Substitution means no substitution and is useful when you need to apply the rule while leaving original URL untouched.|
ISAPI_Rewrite URI rewriting ISAPI filter for Microsoft's IIS server, from Helicon Tech. mod_negotiation Documents URL rewriting in Apache with mod_rewrite.
The URL Rewrite Module in IIS 7 and above provides an import feature that greatly simplifies the process of converting Apache mod_rewrite rules to IIS URL rewrite rules. In this walkthrough, you use the Import Rules feature provided in the URL Rewrite Module to import several mod_rewrite rules into.
Mod_Rewrite/ISAPI Rewrite Help I have ISAPI ReWrite3 which is virtually % compatible with Apache Mod_Rewrite. We are trying to rewrite a simple dynamic URL to a more search-engine friendly one and we are trying to convert all upper/mixed case requests to lowercase.