html pass a link with get parameters within a link

I am trying to pass a link within another in such a way :

http://www.1st_site.com/?u=http://www.2nd_site.com/?parameter1=xyz

I think what the problem is , parameter1=xyz is passed as a parameter for 1st_site

is there any开发者_如何学Goway to avoid that?

You need to URL-encode the entire URL which is represented as query parameter value, else it will be interpreted as part of the request URL, thus this part: http://www.2nd_site.com/?parameter1=xyz.

It's unclear what programming language you're using, but most of decent webbased languages provides functions/methods/classes to achieve this, e.g. URLEncoder in Java, or c:url and c:param in JSP/JSTL, urlencode() in PHP and escape() in JavaScript.

Here's at least an online URL encoder: http://meyerweb.com/eric/tools/dencoder/. If you input http://www.2nd_site.com/?parameter1=xyz, you should get http%3A%2F%2Fwww.2nd_site.com%2F%3Fparameter1%3Dxyz back so the request URL should effectively end up in:

http://www.1st_site.com/?u=http%3A%2F%2Fwww.2nd_site.com%2F%3Fparameter1%3Dxyz