What's the difference between RewriteRule and redirect 301

I was using something like this...

RewriteRule here/(.*) http://www.there.com/$1 [R=301,L] 

but couldn't get it to work

So I used this...

redirect 301 /here http://www.there.com 

and it worked fine.

开发者_运维技巧Can someone explain the difference? Do you need both?

Also... how do I exclude paths from the redirect?

Like... redirect 301 all...

redirect 301 /here http://www.there.com 

but

/here/stayhere.html

Thanks

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RewriteRule is handled by Apache's mod_rewrite, while Redirect is handled by mod_alias. No, you don't need both.

Your RewriteRule (which uses regex) will not match /here (but will match such paths as /here/foo.html) because it is looking for a slash immediately after. You can make that optional by using a question mark:

RewriteRule ^here(/?.*) http://www.there.com$1 [R=301,L]

Now that will have the same effect as your Redirect. RewriteCond can be added to exclude certain paths:

RewriteCond $0 !/here/stayhere\.html

Note that some servers do not have mod_rewrite turned on by default. If adding RewriteEngine on to your configuration does not fix the problem and you cannot switch mod_rewrite on, at least mod_alias provides the RedirectMatch directive, which may be good enough:

RedirectMatch 301 ^/here(?!/stayhere\.html)(/?.*) http://www.there.com$1

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Redirect matches path prefixes. The following Redirect matches any path that’s prefix (path segment wise) is /here and appends it to the new URI:

Redirect 301 /here http://example.com

So any request whose path begins with /here will be redirected to http://example.com wile appending any following path suffixes of /here to http://example.com.

In contrast, RewriteRule works with regular expressions. In this case, the following RewriteRule will match any path that contains here/:

RewriteRule here/(.*) http://example.com/$1 [R=301,L]

Anything after here/ will be appended to the new URL.

While both directives would have the same effect when requesting URLs with paths that begin with /here, rewriterule will also match any request that’s path just contains here/ like /not/here/foo.

Furthermore, you can only use additional conditions with mod_rewrite:

RewriteCond $0 !=here/stayhere.html
RewriteRule ^here(/.*)?$ http://example.com$0 [L,R=301]

If you would want to do the same with mod_alias, you will need to use RedirectMatch with a regular expression that will match anything but /here/stayhere.html.

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The RewriteRule probably didn't work because you're saying a slightly different thing than you were in the redirect. The RewriteRule requires the address to include the word "here", followed by a slash. The redirect requires the address to have the word "here" preceded by a slash. I would go with something like this:

RewriteRule ^here/?(.*) http://www.there.com/$1 [R=301,L]

The added ? makes the slash optional, and the ^ at the beginning makes it so that the "here" has to be at the start of the address, not anywhere inside it.

As for excluding a particular address, you'd want to do that by preceding the RewriteRule with this line:

RewriteCond %{REQUEST_URI} !(here/stayhere\.html)

That tells it to ignore the rule if they're asking for that address specifically.