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# Contributing
1. Fork the repo.
2. Add your section following the [styling guide](#styling).
3. Commit changes.
4. Push your commit.
5. Create a pull request.
6. Wait with your fingers crossed.
## Styling
- Put your snippets into corresponding sections.
- Use `###` headers for your snippets.
- Add some note/description if applicable. People will thank you for that.
- For Apache-related examples, wrap your commands in a `apacheconf` code block.
- For command-line examples, wrap your commands in a `bash` code block.

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# .htaccess Snippets
A collection of useful .htaccess, all in one place. I decided to create this repo after getting so tired (and bored) with Googling everytime there's a need of forcing `www` for my new website.
**Disclaimer**: While dropping the snippet into an `.htaccess` file is most of the time sufficient, there are cases when certain modifications might be required. Use with your own risks.
## Table of Contents
- [Rewrite and Redirection](#rewrite-and-redirection)
- [Security](#security)
- [Performance](#performance)
- [Miscellaneous](#miscellaneous)
## Rewrite and Redirection
Note: It is assumed that you have `mod_rewrite` installed and enabled.
### Force www
``` apacheconf
RewriteEngine on
RewriteCond %{HTTP_HOST} ^example\.com [NC]
RewriteRule ^(.*)$ http://www.example.com/$1 [L,R=301,NC]
```
### Force www in a Generic Way
``` apacheconf
RewriteCond %{HTTP_HOST} !^$
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteCond %{HTTPS}s ^on(s)|
RewriteRule ^ http%1://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
```
This works for _any_ domain. [Source](https://stackoverflow.com/questions/4916222/htaccess-how-to-force-www-in-a-generic-way)
### Force non-www
It's actually [recommended](http://no-www.org/) to remove `www` from your domain. Surprise surprise!
``` apacheconf
RewriteEngine on
RewriteCond %{HTTP_HOST} ^www\.example\.com [NC]
RewriteRule ^(.*)$ http://example.com/$1 [L,R=301]
```
### Force HTTPS
``` apacheconf
RewriteEngine on
RewriteCond %{HTTPS} !on
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
```
### Force Trailing Slash
``` apacheconf
RewriteCond %{REQUEST_URI} /+[^\.]+$
RewriteRule ^(.+[^/])$ %{REQUEST_URI}/ [R=301,L]
```
### Redirect a Single Page
``` apacheconf
Redirect 301 /oldpage.html http://www.yoursite.com/newpage.html
Redirect 301 /oldpage2.html http://www.yoursite.com/folder/
```
[Source](http://css-tricks.com/snippets/htaccess/301-redirects/)
### Redirect an Entire Site
``` apacheconf
Redirect 301 / http://newsite.com/
```
This way does it with links intact. That is `www.oldsite.com/some/crazy/link.html` will become `www.newsite.com/some/crazy/link.html`. This is extremely helpful when you are just "moving" a site to a new domain. [Source](http://css-tricks.com/snippets/htaccess/301-redirects/)
## Security
### Deny All Access
``` apacheconf
Deny from All
```
But wait, this will lock you out from your content as well! Thus introducing...
### Deny All Access Except Yours
``` apacheconf
Order deny, allow
Deny from All
Allow from xxx.xxx.xxx.xxx
```
`xxx.xxx.xxx.xxx` is your IP. If you replace the last three digits with 0/12 for example, this will specify a range of IPs within the same network, thus saving you the trouble to list all allowed IPs separately. [Source](http://speckyboy.com/2013/01/08/useful-htaccess-snippets-and-hacks/)
Now of course there's a reversed version:
### Allow All Access Except Spammers'
``` apacheconf
Order deny, allow
Allow from All
Deny from xxx.xxx.xxx.xxx
Deny from xxx.xxx.xxx.xxy
```
### Deny Access to Hidden Files and Directories
Hidden files and directories (those whose names start with a dot `.`) should most, if not all, of the time be secured. For example: `.htaccess`, `.htpasswd`, `.git`, `.hg`...
``` apacheconf
RewriteCond %{SCRIPT_FILENAME} -d [OR]
RewriteCond %{SCRIPT_FILENAME} -f
RewriteRule "(^|/)\." - [F]
```
### Disable Directory Browsing
``` apacheconf
Options All -Indexes
```
### Disable Image Hotlinking
``` apacheconf
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?yourdomain.com [NC]
RewriteRule \.(jpg|jpeg|png|gif)$ - [NC,F,L]
```
### Password Protect a Directory
First you need to create a `.htpasswd` file somewhere in the system:
``` bash
htpasswd -c /home/fellowship/.htpasswd boromir
```
Then you can use it for authentication:
``` apacheconf
AuthType Basic
AuthName "One does not simply"
AuthUserFile /home/fellowship/.htpasswd
Require valid-user
```
## Performance
### Compress Text Files
``` apacheconf
<IfModule mod_deflate.c>
# Force compression for mangled headers.
# http://developer.yahoo.com/blogs/ydn/posts/2010/12/pushing-beyond-gzipping
<IfModule mod_setenvif.c>
<IfModule mod_headers.c>
SetEnvIfNoCase ^(Accept-EncodXng|X-cept-Encoding|X{15}|~{15}|-{15})$ ^((gzip|deflate)\s*,?\s*)+|[X~-]{4,13}$ HAVE_Accept-Encoding
RequestHeader append Accept-Encoding "gzip,deflate" env=HAVE_Accept-Encoding
</IfModule>
</IfModule>
# Compress all output labeled with one of the following MIME-types
# (for Apache versions below 2.3.7, you don't need to enable `mod_filter`
# and can remove the `<IfModule mod_filter.c>` and `</IfModule>` lines
# as `AddOutputFilterByType` is still in the core directives).
<IfModule mod_filter.c>
AddOutputFilterByType DEFLATE application/atom+xml \
application/javascript \
application/json \
application/rss+xml \
application/vnd.ms-fontobject \
application/x-font-ttf \
application/x-web-app-manifest+json \
application/xhtml+xml \
application/xml \
font/opentype \
image/svg+xml \
image/x-icon \
text/css \
text/html \
text/plain \
text/x-component \
text/xml
</IfModule>
</IfModule>
```
[Source](https://h5bp.com)
### Set Expires Headers
_Expires headers_ tell the browser whether they should request a specific file from the server or just grab it from the cache. It is advisable to set static content's expires headers to something far in the future.
If you don't control versioning with filename-based cache busting, consider lowering the cache time for resources like CSS and JS to something like 1 week. [Source](http://h5bp.com)
``` apacheconf
<IfModule mod_expires.c>
ExpiresActive on
ExpiresDefault "access plus 1 month"
# CSS
ExpiresByType text/css "access plus 1 year"
# Data interchange
ExpiresByType application/json "access plus 0 seconds"
ExpiresByType application/xml "access plus 0 seconds"
ExpiresByType text/xml "access plus 0 seconds"
# Favicon (cannot be renamed!)
ExpiresByType image/x-icon "access plus 1 week"
# HTML components (HTCs)
ExpiresByType text/x-component "access plus 1 month"
# HTML
ExpiresByType text/html "access plus 0 seconds"
# JavaScript
ExpiresByType application/javascript "access plus 1 year"
# Manifest files
ExpiresByType application/x-web-app-manifest+json "access plus 0 seconds"
ExpiresByType text/cache-manifest "access plus 0 seconds"
# Media
ExpiresByType audio/ogg "access plus 1 month"
ExpiresByType image/gif "access plus 1 month"
ExpiresByType image/jpeg "access plus 1 month"
ExpiresByType image/png "access plus 1 month"
ExpiresByType video/mp4 "access plus 1 month"
ExpiresByType video/ogg "access plus 1 month"
ExpiresByType video/webm "access plus 1 month"
# Web feeds
ExpiresByType application/atom+xml "access plus 1 hour"
ExpiresByType application/rss+xml "access plus 1 hour"
# Web fonts
ExpiresByType application/font-woff "access plus 1 month"
ExpiresByType application/vnd.ms-fontobject "access plus 1 month"
ExpiresByType application/x-font-ttf "access plus 1 month"
ExpiresByType font/opentype "access plus 1 month"
ExpiresByType image/svg+xml "access plus 1 month"
</IfModule>
```
### Turn eTags Off
By removing the ETag header, you disable caches and browsers from being able to validate files, so they are forced to rely on your Cache-Control and Expires header. [Source](http://www.askapache.com/htaccess/apache-speed-etags.html)
``` apacheconf
<IfModule mod_headers.c>
Header unset ETag
</IfModule>
FileETag None
```
## Miscellaneous
### Set PHP Variables
``` apacheconf
php_value <key> <val>
# For example:
php_value upload_max_filesize 50M
php_value max_execution_time 240
```
### Custom Error Pages
``` apacheconf
ErrorDocument 400 /errors/breakingbad.html
ErrorDocument 401 /errors/notrespassing.html
ErrorDocument 403 /errors/mordor.html
ErrorDocument 404 /errors/halflife3.html
ErrorDocument 500 /errors/notabugitsafeature.html
```
### Force Downloading
Sometimes you want to force the browser to download some content instead of displaying it. The following snippet will help.
``` apacheconf
<Files *.md>
ForceType application/octet-stream
Header set Content-Disposition attachment
</Files>
```
### Allow Cross-Domain Fonts
CDN-served webfonts might not work in Firefox or IE due to [CORS](https://en.wikipedia.org/wiki/Cross-origin_resource_sharing). The following snippet from [HTML5Boilerplate](http://h5bp.com) should make it happen.
``` apacheconf
<IfModule mod_headers.c>
<FilesMatch "\.(eot|otf|ttc|ttf|woff)$">
Header set Access-Control-Allow-Origin "*"
</FilesMatch>
</IfModule>
```