如何在控制器段之后允许http://作为GET变量的值?

Can someone please tell me why the following gives an error 404

 http://example.com/welcome/?=http://

but any thing else work normally, eg:

 http://example.com/welcome/?=hppt://
 http://example.com/welcome/?=htpp://
 http://example.com/welcome/?=pthh://

And this also works :

 http://example.com/welcome/?=http:/ ( with single slash)

Please help, I'm running into serious trouble and I'm going to reinvent more than 1 month of work just because of this mistake...

Try encoding your query string like this

http://example.com/welcome/?=http:%2F%2F