HttpClient 使用

Api支持

HttpClient 是基于Task的异步方法组，支持取消、超时异步特性，其可以分类为以下：Restful: GetAsync,PostAsync,DeleteAsync,PutAsyncHttpHeaders属性：DefaultRequestHeadersTimeout属性：Timeout，相比HttpRequest的参数，更加地智能，用TimeSpan替换了int。Get扩展（本质上是封装了GetAsync（））：GetStringAsync，GetStreamAsync，GetByteArrayAsyncSendAsync：Restful的实现应该是封装了此方法。需要一个HttpRequestMessage作为参数。

HttpContent

使用post方式请求示例：

public static async Task<string> CreateUrlAsync（string url, Dictionary<string, string> parameters, string accessToken, int timeount = 10）{HttpClient httpClient = new HttpClient（new MyHttpClientHandlerProxy（accessToken））;httpClient.DefaultRequestHeaders.Add（"Authorization", "Bearer " + accessToken）;httpClient.Timeout = TimeSpan.FromSeconds（timeount）;FormUrlEncodedContent content = new FormUrlEncodedContent（parameters）;var response = await httpClient.PostAsync（url, content）;var str = await response.Content.ReadAsStringAsync（）;return str;}

其他的Content类型：StreamContent，StringContent，MutilpartContent，MultipartFormDataContent

HttpClientHandler

作为一个代理角色，可以支持自定义的处理方式。

public class MyHttpClientHandlerProxy : HttpClientHandler{private string accessToken;public MyHttpClientHandlerProxy（string accessToken）{this.accessToken = accessToken;}protected async override Task<HttpResponseMessage> SendAsync（HttpRequestMessage request, System.Threading.CancellationToken cancellationToken）{//处理Headersrequest.Headers.Referrer = new Uri（"www.imctf.com"）;request.Headers.Add（"Authorization", "Bearer " + accessToken）;request.Headers.Add（"UserAgent", "Mozilla/4.0 （compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727）"）;//执行var response = await base.SendAsync（request, cancellationToken）;//处理编码var contentType = response.Content.Headers.ContentType;if （string.IsNullOrEmpty（contentType.CharSet））{contentType.CharSet = "GBK";}return response;}}

使用：HttpClient httpClient = new HttpClient（new MyHttpClientHandlerProxy（accessToken））;Java语言使用HttpClient模拟浏览器登录 http://www.linuxidc.com/Linux/2016-05/131214.htmHttpClient4.3 关于https 中SSL证书请求问题 http://www.linuxidc.com/Linux/2016-04/130090.htmHttpClient4 用法由HttpClient3 升级到 HttpClient4 必看 http://www.linuxidc.com/Linux/2015-06/119100.htmHttpClient 教程 http://www.linuxidc.com/Linux/2015-06/119099.htm使用HttpClient实现文件的上传下载 http://www.linuxidc.com/Linux/2014-07/104303.htmAndroid 实现 HttpClient 请求Https http://www.linuxidc.com/Linux/2014-05/102306.htmAndroid使用HttpClient下载图片 http://www.linuxidc.com/Linux/2014-05/101855.htmHttpClient使用详解 http://www.linuxidc.com/Linux/2014-08/104945.htm本文永久更新链接地址