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,PutAsync

HttpHeaders属性：DefaultRequestHeaders

Timeout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，

GetByteArrayAsync

SendAsync：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));