/// <summary>
/// 发起 HTTP，需要调用方自行释放响应对象
/// <para>
/// 注：4.0 版本的 WebRequest 默认限制连接并发数。
/// 如果要提高并发数，需自行设置 ServicePointManager.DefaultConnectionLimit 属性
/// </para>
/// </summary>
/// <param name="uri">请求路径</param>
/// <param name="configuration">HTTP 配置</param>
/// <returns></returns>
public static HttpWebResponse Send(string uri, HttpConfiguration configuration)
{
int tryTimes = configuration != null && configuration.TryTimes != null ? configuration.TryTimes.Value : 0;
int sleep = configuration != null && configuration.Sleep != null ? configuration.Sleep.Value : 500;
return(WebHelper.Send(uri, configuration, tryTimes, sleep));
}
/// <summary>
/// 使用 POST 方式提交请求，需要调用方自行释放响应对象
/// </summary>
/// <param name="uri">请求路径</param>
/// <param name="configuration">HTTP 配置</param>
public static T Delete <T>(string uri, HttpConfiguration configuration)
{
if (configuration == null)
{
configuration = new HttpConfiguration <T>();
}
configuration.Method = HttpMethod.Delete;
var response = WebHelper.Send(uri, configuration);
return(WebHelper.ReadAsResult <T>(response, configuration));
}
// 发起 HTTP请求
static HttpWebResponse Send(string uri, HttpConfiguration configuration, int tryTimes, int sleep)
{
if (uri != null)
{
#if netcore
if (uri.StartsWith("https", StringComparison.OrdinalIgnoreCase))
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.SystemDefault | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
}
#endif
#if net45
if (uri.StartsWith("https", StringComparison.OrdinalIgnoreCase))
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
}
#endif
#if net40
if (uri.StartsWith("https", StringComparison.OrdinalIgnoreCase))
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | (SecurityProtocolType)768 | (SecurityProtocolType)3072;
}
#endif
}
try
{
// 创建请求
var request = WebRequest.Create(uri) as HttpWebRequest;
request.Method = "GET";
//// 默认连接最大数=2，如果没有全局设置，则需要设置并发连接数
//if (ServicePointManager.DefaultConnectionLimit == 2) request.ServicePoint.ConnectionLimit = 65532;
if (configuration != null)
{
request.ContentLength = 0;
request.Method = configuration.Method.ToString().ToUpper();
if (configuration.Timeout != null)
{
request.Timeout = configuration.Timeout.Value;
}
if (configuration.ContentType != null)
{
request.ContentType = configuration.ContentType;
}
if (configuration.Accept != null)
{
request.Accept = configuration.Accept;
}
if (configuration.UserAgent != null)
{
request.UserAgent = configuration.UserAgent;
}
if (configuration.KeepAlive != null)
{
request.KeepAlive = configuration.KeepAlive.Value;
}
if (configuration.Proxy != null)
{
request.Proxy = configuration.Proxy;
}
if (configuration.Headers != null)
{
foreach (var kv in configuration.Headers)
{
request.Headers.Add(kv.Key, kv.Value);
}
}
if (configuration.CookieContainer != null)
{
request.CookieContainer = configuration.CookieContainer;
}
// 写入参数
string content = null;
if (configuration.Content != null && configuration.Content is string)
{
content = (string)configuration.Content;
}
else if (configuration.Content != null)
{
content = SerializeHelper.SerializeToJson(configuration.Content);
}
if (!string.IsNullOrEmpty(content))
{
var encoding = configuration.Encoding ?? Encoding.UTF8;
byte[] bytes = encoding.GetBytes(content);
request.ContentLength = bytes.Length;
using (var stream = request.GetRequestStream())
{
stream.Write(bytes, 0, bytes.Length);
stream.Close();
}
}
}
var response = request.GetResponse() as HttpWebResponse;
return(response);
}
catch (WebException we)
{
tryTimes--;
if (tryTimes > 0)
{
System.Threading.Thread.Sleep(sleep);
return(WebHelper.Send(uri, configuration, tryTimes, sleep));
}
else
{
WebHelper.ThrowWebException(we);
throw;
}
}
}