How can I include header parameters in HttpClient for .NET Core?

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To include header parameters in HttpClient for .NET Core, you can use the HttpRequestMessage class, which allows you to create an HTTP request with a custom set of headers. Here's an example:

using System.Net.Http;

// create a new HttpClient
var httpClient = new HttpClient();

// create a new HttpRequestMessage
var request = new HttpRequestMessage();

// add headers to the request
request.Headers.Add("Authorization", "Bearer my-access-token");
request.Headers.Add("X-Api-Key", "my-api-key");

// send the request
var response = await httpClient.SendAsync(request);

In this example, we're adding two headers to the request - an authorization header with a bearer access token, and a custom x-api-key header. You can add as many headers as needed by calling the Add() method on the Headers property of the HttpRequestMessage.