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How to do a 301/302 redirect in an Azure Function App with HttpResponseMessage

Azure Function Apps' use the HttpRequestMessage and HttpResponseMessage classes introduced with .Net Fx 4.5 (which are heavily used in .Net Core Web API projects). It takes a little bit of re-learning to do the normal web stuff you're used to doing, like redirects.

To do a redirect with HttpResponseMessage, make a new message with the Moved code (for 302, or Redirect for 301), and then set the Headers.Location to your target page. For example:

HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.Moved);
response.Headers.Location = location;
return response;

In the Azure Function App environment, you may instead wish to use the req.CreateResponse() pattern:

HttpResponseMessage response = req.CreateResponse(HttpStatusCode.Moved);
response.Headers.Location = location;
return response;

I've tested it and it works just the same.

Happy hacking