Javascript-js or PHP has no function to determine a URL, if the 404-hop A address if it is not 404 direct request URL Line

JS or PHP has no function to determine a URL, if the request is 404, jump a address if it is not 404 direct request URL Line

The URL I requested is the Android client Schema:myapp this form .....

This is the URL geo:39.901149,116.41851?z=14
This means that if the client has GoogleMap installed then open the GoogleMaps app and request it directly if it is not installed geo:39.901149,116.41851?z=14

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JS or PHP has no function to determine a URL, if the request is 404, jump a address if it is not 404 direct request URL Line

The URL I requested is the Android client Schema:myapp this form .....

This is the URL geo:39.901149,116.41851?z=14
This means that if the client has GoogleMap installed then open the GoogleMaps app and request it directly if it is not installed geo:39.901149,116.41851?z=14

If you want to deal with the problem of your own site, directly on the page to jump on the line, you think so many sites unified 404 pages where the ....

If you are referring to the URL to crawl other sites, then do it, get the HTTP return status code to determine whether it is 404.

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