前言
HttpClient在Web调用中具有广泛的应用,而为它添加默认请求头是我们经常遇到的需求,本文介绍4种为HttpClient添加默认请求头的方式。下面话不多说了,来一起看看详细的介绍吧
第一种方式
直接在创建的HttpClient对象的DefaultRequestHeaders集合中添加报头。
class Program{ static Task Main()=> SendAsync1(); private static async Task SendAsync1() { var httpClient = new HttpClient(); AddDefaultHeaders(httpClient); await httpClient.GetStringAsync("http://localhost:5000/"); } private static void AddDefaultHeaders(HttpClient httpClient) { httpClient.DefaultRequestHeaders.Add("x-pile(); } } private static void AddDefaultHeaders(HttpRequestMessage request) { request.Headers.Add("x-www-foo", "123"); request.Headers.Add("x-www-bar", "456"); request.Headers.Add("x-www-baz", "789"); }}第四种方式
上面这种方式可以采用强类型编程方式,具体的代码如下。
class Program{ static Task Main()=> SendAsync4(); private static async Task SendAsync4() { DiagnosticListener.AllListeners.Subscribe(listener => { if (listener.Name == "HttpHandlerDiagnosticListener") { listener.SubscribeWithAdapter(new HttpClientListener()); } }); var httpClient = new HttpClient(); await httpClient.GetStringAsync("http://localhost:5000/"); } private sealed class HttpClientListener { [DiagnosticName("System.Net.Http.HttpRequestOut.Start")] public void OnSend(HttpRequestMessage request) => AddDefaultHeaders(request); //Must subscribute the System.Net.Http.HttpRequestOut event. [DiagnosticName("System.Net.Http.HttpRequestOut")] public void OnSend() { } } private static void AddDefaultHeaders(HttpRequestMessage request) { request.Headers.Add("x-www-foo", "123"); request.Headers.Add("x-www-bar", "456"); request.Headers.Add("x-www-baz", "789"); }}总结
以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作具有一定的参考学习价值,谢谢大家对的支持。