Response redirect ONLY if browser URI gives an 404 error

Hello All,

How does one redirect to an external URL in the response ONLY if the URI in the browser returns a 404?

 

 

 

ex) When you hit a page and the URL in the browser is "http://xyz.com/xyz". You ONLY want to redirect if

 

"http://xyz.com/xyz" returns a 404. What you do NOT want is if a image request "http://xyz.com/imagexyz" within the page

 

returns a 404 and the response event redirect the user.

 

 

 

1) request --> "http://xyz.com/xyz" // return 404

 

2) request --> "http://xyz.com/imagexyz" // return 404

 

3) response --> redirect to external URL

 

 

 

1) request --> "http://xyz.com/xyz" // return 200

 

2) request --> "http://xyz.com/imagexyz" // return 404

 

3) response --> NO redirect happens

 

 

 

 

Hopefully that made sense.

 

 

 

Thank you in advance.

 

 

 

Regards,

 

TRX