How to Test Facebook Connect Locally

I use ASP .NET and Facebook Connect APIs. but when I run the app and press Connect button it's return to the Website not to the test local server which is (http://localhost:xxxx/test.aspx) So how I can test Facebook locally (i.e How I can change the callback url) ?

It's simple enough when you find out.

Open /etc/hosts (unix) or C:\WINDOWS\system32\drivers\etc\hosts.

If your domain is foo.com, then add this line:

127.0.0.1    local.foo.com

When you are testing, open local.foo.com in your browser and it should work.

Edit your app at www.facebook.com/developers/ and set the "Site URL" to "http://localhost/myapppath".

When done - change it back.

Facebook has added test versions feature.

First, add a test version of your application: Create Test App

Then, change the Site URL to "http://localhost" under Website, and press Save Changes

That's all, but be careful: App ID and App Secret keys are different for the application and its test versions!

I suggest creating a test app (for dev environment only) on https://developers.facebook.com/apps and set: Website with Facebook Login property to your localhost:[port] settings.
this option will work fine with no need to change hosts.
remember to change the appId back to your production app once you go live.

Edit - in the latest fb version you'll find it under the settings tab.