将所有流量从外部域重定向到本地域主页？

Question

There is an external website which is redirecting all its traffic to webpages on our site. We can't control this redirection and the content URLs are mirrored in the following way.

When users go to:

www.externaldomain.com/1234 

they get redirected to:

www.ourdomain.com/1234 

which can sometimes be a non-existant page and thus a 404 error results. How can I re-direct all traffic from externaldomain.com to ourdomain.com homepage to make sure we don't lose potential users?

I know HTTP_REFERER comes into play, but I'm having trouble setting it up getting it to function properly.

Answer 1

See this answer

You must use modrewrite of apache:

RewriteEngine On

RewriteCond %{HTTP_REFERER} !^mydomain.co.uk$ [N]

Answer 2

The most important question to ask here is whether you wish to redirect all traffic to your homepage or specific pages that you've mentioned 'sometimes' don't exist (404) - both of which which are answered here.

Redirecting all referred traffic to a homepage from a specific external domain

Where you need to redirect all traffic from a specific domain (referrer), you can do the following:

 RewriteEngine On 
 RewriteCond %{HTTP_REFERER} ^http://externaldomain\.com/ [NC]
 RewriteRule ^(.*) /index.php [R=301,L] 

Redirecting only 404 error traffic to a homepage from a specific domain

If you want to redirect on this basis then use:

 RewriteEngine On 
 RewriteCond %{HTTP_REFERER} ^http://externaldomain\.com/ [NC]
 RewriteCond %{REQUEST_FILENAME} !-f
 RewriteCond %{REQUEST_FILENAME} !-d
 RewriteRule ^(.*) /index.php [R=301,L] 

With regard to the apache flags noted above:

 [NC]    = No case (or case insensitive)
 [L]     = If the rule matches, no further rules will be processed.
 [R=301] = Apply a 301 redirect*

You can find more verbose/detailed info on Apache flags here .

*Search engine optimisation for these rules

Why a 301 redirect? - A 301 redirect is a permanent redirect which passes more than 90+% of link juice (or potential ranking power ) to the redirected page. 301 refers to the HTTP status code for this type of redirect. In most instances, the 301 redirect is the best method for implementing redirects on a website in terms of SEO. In terms of benefit, there is a wealth of information here on how to capitalise on and deal with different types of redirect.