Apache .htaccess

Apache htaccess

htaccess is a configuration file that begins with a period (.) that is read by the web-server first before any other content files and sets the features and rules as to how the server will process any other files or directives within the folder that the .htaccess file is located.

The .htaccess file can be used to redirection, modifying directory  order rules, rewriting complex urls so they appear more human or search engine friendly, set access rules to make areas or files password protected or accessible from only select ip addresses.

htaccess is for advanced webmasters and developers and if improperly set can cause looping that will cause the firewall to block your website so caution should always be excercised.

 

htaccess Cheatsheet

 

Here is a simple cheatsheet for the .htaccess file:

Enable Directory Browsing

Options +Indexes
## block a few types of files from showing
IndexIgnore *.wmv *.mp4 *.avi

Disable Directory Browsing

Options All -Indexes

Customize Error Messages

ErrorDocument 403 /forbidden.html
ErrorDocument 404 /notfound.html
ErrorDocument 500 /servererror.html

Get SSI working with HTML/SHTML

AddType text/html .html
AddType text/html .shtml
AddHandler server-parsed .html
AddHandler server-parsed .shtml
# AddHandler server-parsed .htm

Change Default Page (order is followed!)

DirectoryIndex myhome.htm index.htm index.php

Block Users from accessing the site

<limit GET POST PUT>
order deny,allow
deny from 202.54.122.33
deny from 8.70.44.53
deny from .spammers.com
allow from all
</limit>

Allow only LAN users

order deny,allow
deny from all
allow from 192.168.0.0/24

Redirect Visitors to New Page/Directory

Redirect oldpage.html http://www.domainname.com/newpage.html
Redirect /olddir http://www.domainname.com/newdir/

Block site from specific referrers

RewriteEngine on
RewriteCond %{HTTP_REFERER} site-to-block\.com [NC]
RewriteCond %{HTTP_REFERER} site-to-block-2\.com [NC]
RewriteRule .* - [F]

Block Hot Linking/Bandwidth hogging

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?mydomain.com/.*$ [NC]
RewriteRule \.(gif|jpg)$ - [F]

Want to show a “Stealing is Bad” message too?

Add this below the Hot Link Blocking code:

RewriteRule \.(gif|jpg)$ http://www.mydomain.com/dontsteal.gif [R,L]

Stop .htaccess (or any other file) from being viewed

<files file-name>
order allow,deny
deny from all
</files>

Avoid the 500 Error

# Avoid 500 error by passing charset
AddDefaultCharset utf-8

Grant CGI Access in a directory

Options +ExecCGI
AddHandler cgi-script cgi pl
# To enable all scripts in a directory use the following
# SetHandler cgi-script

Password Protecting Directories

Use the build in cPanel Password Protected Directories

Change Script Extensions

AddType application/x-httpd-php .gne

gne will now be treated as PHP files! Similarly, x-httpd-cgi for CGI files, etc.

Use MD5 Digests

Performance may take a hit but if thats not a problem, this is a nice option to turn on.

ContentDigest On

The CheckSpelling Directive

From Jens Meiert: CheckSpelling corrects simple spelling errors (for example, if someone forgets a letter or if any character is just wrong). Just add CheckSpelling On to your htaccess file.

The ContentDigest Directive

As the Apache core features documentation says: “This directive enables the generation of Content-MD5 headers as defined in RFC1864 respectively RFC2068. The Content-MD5 header provides an end-to-end message integrity check (MIC) of the entity-body. A proxy or client may check this header for detecting accidental modification of the entity-body in transit.

Note that this can cause performance problems on your server since the message digest is computed on every request (the values are not cached). Content-MD5 is only sent for documents served by the core, and not by any module. For example, SSI documents, output from CGI scripts, and byte range responses do not have this header.”

To turn this on, just add ContentDigest On.

Enable Gzip – Save Bandwidth

# BEGIN GZIP
<ifmodule mod_deflate.c>
# Combine the below two lines - I've split it up for presentation
AddOutputFilterByType DEFLATE text/text text/html text/plain text/xml text/css
  application/x-javascript application/javascript
</ifmodule>
# END GZIP

Turn off magic_quotes_gpc

# Only if you use PHP
<ifmodule mod_php4.c>
php_flag magic_quotes_gpc off
</ifmodule>

Set an Expires header and enable Cache-Control

<ifmodule mod_expires.c>
  ExpiresActive On
  ExpiresDefault "access plus 1 seconds"
  ExpiresByType text/html "access plus 7200 seconds"
  ExpiresByType image/gif "access plus 518400 seconds"
  ExpiresByType image/jpeg "access plus 518400 seconds"
  ExpiresByType image/png "access plus 518400 seconds"
  ExpiresByType text/css "access plus 518400 seconds"
  ExpiresByType text/javascript "access plus 216000 seconds"
  ExpiresByType application/x-javascript "access plus 216000 seconds"
</ifmodule>

<ifmodule mod_headers.c>
  # Cache specified files for 6 days
  <filesmatch "\.(ico|flv|jpg|jpeg|png|gif|css|swf)$">
  Header set Cache-Control "max-age=518400, public"
  </filesmatch>
  # Cache HTML files for a couple hours
  <filesmatch "\.(html|htm)$">
  Header set Cache-Control "max-age=7200, private, must-revalidate"
  </filesmatch>
  # Cache PDFs for a day
  <filesmatch "\.(pdf)$">
  Header set Cache-Control "max-age=86400, public"
  </filesmatch>
  # Cache Javascripts for 2.5 days
  <filesmatch "\.(js)$">
  Header set Cache-Control "max-age=216000, private"
  </filesmatch>
</ifmodule>

 

RESOURCE LINKS:

http://www.htaccess-guide.com

http://www.htaccessredirect.net

 

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