Skip to main content

mod rewrite - Redirect, Change URLs or Redirect HTTP to HTTPS in Apache - Everything You Ever Wanted to Know About Mod_Rewrite Rules but Were Afraid to Ask


This is a Canonical Question about Apache's mod_rewrite.





Changing a request URL or redirecting users to a different URL than the one they originally requested is done using mod_rewrite. This includes such things as:




  • Changing HTTP to HTTPS (or the other way around)

  • Changing a request to a page which no longer exist to a new replacement.

  • Modifying a URL format (such as ?id=3433 to /id/3433 )

  • Presenting a different page based on the browser, based on the referrer, based on anything possible under the moon and sun.

  • Anything you want to mess around with URL




Everything You Ever Wanted to Know about Mod_Rewrite Rules but Were Afraid to Ask!



How can I become an expert at writing mod_rewrite rules?




  • What is the fundamental format and structure of mod_rewrite rules?

  • What form/flavor of regular expressions do I need to have a solid grasp of?

  • What are the most common mistakes/pitfalls when writing rewrite rules?

  • What is a good method for testing and verifying mod_rewrite rules?

  • Are there SEO or performance implications of mod_rewrite rules I should be aware of?


  • Are there common situations where mod_rewrite might seem like the right tool for the job but isn't?

  • What are some common examples?



A place to test your rules



The htaccess tester web site is a great place to play around with your rules and test them. It even shows the debug output so you can see what matched and what did not.

Comments

Post a Comment

Popular posts from this blog

linux - iDRAC6 Virtual Media native library cannot be loaded

When attempting to mount Virtual Media on a iDRAC6 IP KVM session I get the following error: I'm using Ubuntu 9.04 and: $ javaws -version Java(TM) Web Start 1.6.0_16 $ uname -a Linux aud22419-linux 2.6.28-15-generic #51-Ubuntu SMP Mon Aug 31 13:39:06 UTC 2009 x86_64 GNU/Linux $ firefox -version Mozilla Firefox 3.0.14, Copyright (c) 1998 - 2009 mozilla.org On Windows + IE it (unsurprisingly) works. I've just gotten off the phone with the Dell tech support and I was told it is known to work on Linux + Firefox, albeit Ubuntu is not supported (by Dell, that is). Has anyone out there managed to mount virtual media in the same scenario?
Post a Comment
Read more

ubuntu - Monitoring CPU, Mem, disk, on a single server

I've been looking for a simple starter solution for monitoring my [currently] single server hosted solution. Other than Nagios and similar, are there other good (simple) solutions people are using? Answer Everything depends on what you want. For example Munin is very simple, you can install and configure it in less then 10 minutes (on one server), it can sends alarms, make graphs from monitoring cpu, mem. apache connections, eaccellerator, disk io and many many more (it has many plugins). But if you are planning in future get some more machines, munin may not be enough. For example in munin you cant monitor state of individual processes, can't monitor changes in files (for security purpose). So if you wanna only see what is the utilization of basics parameters on your server and don't plan to buy some more servers Munin is what you are looking for, but if you wanna be alarmed when some of your service is down, take more control on what is happeninig on...
Post a Comment
Read more

hp proliant - Smart Array P822 with HBA Mode?

We get an HP DL360 G8 with an Smart Array P822 controller. On that controller will come a HP StorageWorks D2700 . Does anybody know, that it is possible to run the Smart Array P822 in HBA mode? I found only information about the P410i, who can run HBA. If this is not supported, what you think about the LSI 9207-8e controller? Will this fit good in that setup? The Hardware we get is used but all original from HP. The StorageWorks has 25 x 900 GB SAS 10K disks. Because the disks are not new I would like to use only 22 for raid6, and the rest for spare (I need to see if the disk count is optimal or not for zfs). It would be nice if I'm not stick to SAS in future. As OS I would like to install debian stretch with zfs 0.71 as file system and software raid. I have see that hp has an page for debian to. I would like to use hba mode because it is recommend, that zfs know at most as possible about the disk, and I'm independent from the raid controller. For us zfs have many benefits, ...
Post a Comment
Read more