Reminder of RewriteRule flags :
| RewriteRule Flags | What it does | ||
|---|---|---|---|
| L | Last. Stop processing RewriteRules once this one matches. Order counts! | ||
| C | Chain. Continue processing the next RewriteRule. If this rule doesn’t match, then the next rule won’t be executed. More on this | later. | |
| E | Set environmental variable. Apache has various environmental variables that can affect web-server behavior. | ||
| F | Forbidden. Returns a 403-Forbidden error if this rule matches. | ||
| G | Gone. Returns a 410-Gone error if this rule matches. | ||
| H | Handler. Forces the request to be handled as if it were the specified MIME-type. | ||
| N | Next. Forces the rule to start over again and re-match. BE CAREFUL! Loops can result. | ||
| NC | No case. Allows [jpg] to match both jpg and JPG. | ||
| NE | No escape. Prevents the rewriting of special characters (. ? # & etc) into their hex-code equivalents. | ||
| NS | No subrequests. If you’re using server-side-includes, this will prevent matches to the included files. | ||
| P | Proxy. Forces the rule to be handled by mod_proxy. Transparently provide content from other servers, because your web-server | fetches it and re-serves it. This is a dangerous flag, as a poorly written one will turn your web-server into an open-proxy and That is Bad. | |
| PT | Pass Through. Take into account Alias statements in RewriteRule matching. | ||
| QSA | QSAppend. When the original string contains a query (http://example.com/thing?asp | foo) append the original query string to the | rewritten string. Normally it would be discarded. Important for dynamic content. |
| R | Redirect. Provide an HTTP redirect to the specified URL. Can also provide exact redirect code [R | 303]. Very similar to | RedirectMatch, which is faster and should be used when possible. |
| S | Skip. Skip this rule. | ||
| T | Type. Specify the mime-type of the returned content. Very similar to the AddType directive. |
Example
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RewriteCond %{HTTP_HOST} ^[^.]+\.[^.]+$ [NC]
RewriteRule ^ https://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L,NE]
Example 1 - Redirect example.com to www.example.com:
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RewriteEngine On
RewriteCond %{HTTP_HOST} !^www.example.com$ [NC]
RewriteRule ^(.*)$ http://www.example.com/$1 [L,R=301]
Example 2 - Redirect www.example.com to example.com:
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RewriteEngine on
RewriteCond %{HTTP_HOST} ^www\.example\.com$
RewriteRule ^/?$ "http\:\/\/example\.com\/" [R=301,L]
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