Localhost development with Live Services

If you are planning to do development using the Live Services you will probably want to register a Live Services Project where the Return URL is an address on you local machine.  Unfortunately the UI on the Azure Services Developer Portal isn’t that informative which can lead to a bit of confusion.  In the following image I’ve attempted to register a new project where the Return URL is a local address on my machine.  Since the Domain is the top level domain that is in the Return URL I figured that I needed to put localhost in the Domain field.

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As you can see this generated the error “Invalid application domain name.”  Whilst this error message is technically correct it would be better if it said “you don’t need to specify a domain if your return url is on your local machine”.  The upshot is that if you want to use a local address you can simply omit this field.

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