.htaccess is a configuration file for use on web servers running the Apache Web Server software and below is some of useful configuration.
1. Create .htaccess file with notepad or any text editor and paste it below code
2. Upload it into your web server and remove ".txt" after uploaded
For more info: http://www.htaccess-guide.com/
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# Note: Hash sign (#) for comments
#Redirect non-www to www
RewriteEngine On
RewriteCond %{HTTP_HOST} ^yourdomain.com [NC]
RewriteRule ^(.*)$ http://www.yourdomain.com/$1 [L,R=301]
#Redirect non-www to www (Option 2)
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]
# Change .php extension to .html
RewriteEngine On
RewriteRule ^(.*)\.html$ $1.php [nc]
#Force https
RewriteEngine On
RewriteCond %{HTTPS} !=on
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
#Force https (option 2)
RewriteEngine On
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://www.example.com/$1 [R=301,L]
#Force https (option 3)
#Force www / https
RewriteEngine on
RewriteCond %{HTTP_HOST} ^yourdomain.com [NC]
RewriteRule ^(.*)$ https://www.yourdomain.com/$1 [L,R=301,NC]
# Directory Index: You can change a default index file from another directory (eg. index.php is inside welcome folder)
# DirectoryIndex welcome index.php
# Access Control: You can Deny / Allow over specific IP address and it's useful when you are doing site updates
Order deny,allow
# Deny all public access
Deny from all
# Allow your IP address so only you can see the site
Allow from xxx.xx.xx.xxx
# Redirect your users to a temporary an error page, welcome page or maintenance page during site update/development with your custom page
ErrorDocument 403 /welcome/comingsoon.php
# Prevent Directory Browsing (Disable/Enable)
# To Disable
Options All -Indexes
# To Enable
# Options All +Indexes
# Create custom error pages and do not forget to create related error html file in source
# And you can extend this like as well:
# ErrorDocument 400 /400.html #400 - Bad Request
# ErrorDocument 401 /401.html #401 - Not Authorized
# ErrorDocument 403 /403.html #403 - Forbidden
# ErrorDocument 404 /404.html #404 - Not Found
# ErrorDocument 500 /500.html #500 - Internal Server Error
# ErrorDocument 502 /502.html #502 - Bad Gateway
# ErrorDocument 504 /504.html #504 - Timeout Error
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