如何使用javascript / jquery获取网址？

Question

i need to fetch a url with javascript/jquery and not php.

i've read that you could do that if you got a php proxy, but that means that it is still going through php. cause then it's still the ip of the server that is fetching it.

could one fetch the url entirely with only front-end, and thus fetch it with the client's ip?

Answer 1

There exists a Same origin policy for AJAX requests. This prevents Javascript on, say, this site, from making a request to gmail.com (with your cookies), reading your e-mails, and uploading them to the StackOverflow server. Javascript on stackoverflow.com can only make AJAX requests to pages on that domain.

As you can see, this is essential for security. Requests must instead be made by a proxy running on your web server - PHP can be used, but there are other solutions. For example, Ajax Cross Domain is an AJAX library that communicates with a Perl script running on the server to emulate AJAX requests for other domains.

It is also possible to make requests on other domains via a javascript include (script tag), image tag, etc. but in these cases you cannot read the contents of the page.

You cannot do this with an iframe either: scripts cannot see the internals of iframes unless they are on the same domain as the script.

So in short, use a proxy.

Answer 2

The problem is that jQuery would fetch an url with AJAX and AJAX won't operate cross-domain because of the potential security (as per the same-origin policy ).

There are however ways to emulate this, if you load the page in an iframe you can retrieve the data by using innerHTML on the iframe. Here's an example script that uses jQuery: http://code.google.com/p/jquery-crossframe/