How below rewrite rule works

RewriteCond     %{REQUEST_URI}  ^/(mysite|yoursite)$
RewriteRule     ^(.*)           $1/     [R=301,L]

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As per my understanding when you use R=301 then you need to provide a domain name (e.g. so that redirection can happen, what is the point in redirecting in the same server?
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Steve BinkCommented:
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The [R] flag indicates that the redirection result should be sent to the client browser.  While you *can* provide a protocol, host, and port, they are optional - any missing items will be replaced with their counterparts from the current request.  In your example, the server will issue a 301 response to the client, which will make a second request to the same URL, only with a final '/' at the end.

The purpose of forcing an external redirect is generally to make the client aware of the new canonical URL for whatever resource they are requesting.  In this instance, forcing the '/' suffix may seem picky, but it could be important for CMS routing, or other application-level concerns.  Additionally, spiders (e.g., search engines) are supposed to honor the responses.  This rewrite is an inexpensive way, for example, to tell Google to correct a search result.

Without the [R] flag, this redirect would become a rewrite, meaning the server internally translates the requested URL to a new location without informing the client.  In the server's workflow, the request is still resubmitted as a new request, but there's no associated network traffic.  The only noticeable difference is that client will not know about the change (the address bar stays the same), and makes only one request.

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