Testing external service callbacks locally using Fiddler2 and IIS Express

Some providers will not accept localhost as a callback URL, which can make testing external services difficult. Other problems with local networks could also cause various problems when trying to test callbacks locally. In this appendix, you are going to set up a workaround that can help when working with a specified call-back URL.

You want to provide either a URL for an existing development server/environment or a URL you are going to redirect to your local machine for testing. If you don't have a development server to deploy to, and want to test it locally, put it in http://localdev.<websiteurl>/, where <websiteurl> might be your production domain or a temporary name used only for testing. It can be any valid URL, but to avoid problems, you want to avoid locally redirecting a real URL.

The following instructions are for local development with IIS Express:

• If not already installed, download and install...