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"No Access-Control-Allow-Origin header is present"

by Jon Hilton

When a front-end application (think javascript) tries to access your ASP.NET Core API, if your API is hosted at a different "origin" then you'll see the dreaded "CORS" error.

Use this tool to make your ASP.NET Core API and front-end app play nice.

#1 Where is your ASP.NET Core API hosted?

#2 Where are your client (e.g. javascript) apps hosted?

Need to add more than one? Click the + icon

© Jon Hilton