htaccess中301重定向的相对URL重写

Question

I used to have a documentation file at https://example.com/myapp/doc/file.html , but I have now decided to host the documentation at https://example.com/myapp/doc/ . Note that the path can be different, eg http://customer.com:8080/foo/bar/myapp/doc/file.html .

How can I use htaccess to redirect to the correct directory? My tries were:

RewriteEngine On
RewriteRule ^file\.html$ "" [R=301]

This puts a filesystem path in the URL and is totally unsuitable. If I wanted an internal redirect it would probably work, but I explicitly want a 301.

RewriteEngine On
RewriteRule ^file\.html$ "%{REQUEST_SCHEME}://%{HTTP_HOST}/myapp/doc/" [R=301]

This works, but only when my app is installed into the URL root. When a customer puts it into /foo/bar , it fails.

How can I 301-redirect to the current directory?

Answer 1

Following code should work from any where to redirect file.html in current directory to current directory itself without any hardcoding of paths. It compares REQUEST_URI variable (which is complete path) with the URI matched by RewriteRule (which is relative to current path) and gets differential in %{ENV:BASE} variable.

RewriteEngine On

# find rewrite base dynamically
RewriteCond $0#%{REQUEST_URI} ^([^#]*)#(.*)\1$
RewriteRule ^.*$ - [E=BASE:%2]

RewriteRule ^file\.html$ %{ENV:BASE} [L,R=301,NC]

For example, it will perform following redirects:

• /foo/bar/myapp/doc/file.html to /foo/bar/myapp/doc/
• /myapp/doc/file.html to /myapp/doc/
• /some/path/file.html to /some/path/