How to extract custom header value?

Question

I have this exact code from the accepted answer in my project which I need to migrate into ASP.NET Core MVP.

How to extract custom header value in Web API message ha

Answer 1

Request.Headers returns Microsoft.AspNetCore.Http.IHeaderDictionary interface that define next property:

StringValues this[string key] { get; set; }

IHeaderDictionary has a different indexer contract than IDictionary, where it will return StringValues.Empty for missing entries.

Return type: Microsoft.Extensions.Primitives.StringValues

Returns: The stored value, or StringValues.Empty if the key is not present.

So, you can simply use Request.Headers["environment"] to get value of "environment" header