using System.Net.Http.Headers; HttpClient client = new HttpClient(); client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", "YourToken");
using System.Net.Http; HttpClient client = new HttpClient(); client.DefaultRequestHeaders.Add("X-MyHeader", "MyValue");This code sets up a new instance of the HttpClient class and then adds a custom header to the request. The Add() method is used to specify the name and value of the header. Package/Library: System.Net.Http