ASP.NET MVC add headers and redirect to an external url

Question

I need to write an small ASP.NET MVC website which sole purpose is to capture headers sent from a legacy website, add these headers to a request and redirect to a Blazor server app (including headers).

How can I add headers to a request and redirect to an external URL in a controller action?

I've tried HttpClient, WebClient and HttpWebRequest but none support redirecting.

I also tried:

Response.Headers.Add("Test", "Test redirect");
Response.Redirect("https://mywebsite.com/", true);

The redirection works but the header is not added.

Answer 1

You cannot do that, because 302 redirect are handled by browser and it will not re-attach headers, refer to this answer.

So you can try to create a new response which you need to manually manage all response details, including status codes, redirect URLs, and all custom headers.

example:

Response.StatusCode = 302;

Response.Headers.Add("Location", "https://mywebsite.com/");

Response.Headers.Add("Test", "Test redirect");
Response.Headers.Add("AnotherHeader", "AnotherValue");
...