/// <summary>
/// 发送到指定的URL的请求
/// </summary>
/// <param name="url">请求的URL</param>
/// <param name="postData">要发送的数据</param>
/// <param name="requestType">请求类型 POST GET</param>
/// <param name="contentType">请求的内容类型。默认值是'application/x-www-form-urlencoded'.</param>
/// <param name="userAgent">请求 UserAgent</param>
/// <param name="keepAlive">KeepAlive true/false</param>
/// <param name="credentials">使用的凭据</param>
/// <param name="proxy">使用代理</param>
/// <param name="timeout">超时</param>
/// <param name="encoding">设置响应编码</param>
/// <param name="postDataEncoding">设置POST数据编码</param>
/// <returns>返回请求的数据</returns>
public static string SendRequest(string url, string postData, string requestType, string contentType, string userAgent, bool? keepAlive, ICredentials credentials, IWebProxy proxy, int? timeout, Encoding encoding, Encoding postDataEncoding, WebHeaderCollection webHeaderCollection = null) {
if (!String.IsNullOrEmpty(url)) {
HttpWebRequest webReq;
HttpWebResponse webResp = null;
if (postDataEncoding == null) postDataEncoding = Encoding.UTF8;
try {
webReq = (HttpWebRequest)WebRequest.Create(url);
webReq.Method = requestType;
if (webHeaderCollection.IsNotNull()) webReq.Headers = webHeaderCollection;
if (credentials.IsNotNull()) webReq.Credentials = credentials;
if (proxy.IsNotNull()) webReq.Proxy = proxy;
if (timeout.IsNotNull()) webReq.Timeout = (int)timeout;
webReq.ServicePoint.Expect100Continue = false;
//webReq.PreAuthenticate = true;
//webReq.AllowWriteStreamBuffering = true;
webReq.ContentType = !String.IsNullOrEmpty(contentType) ? contentType : "text/xml"; // "application/x-www-form-urlencoded";
if (!String.IsNullOrEmpty(userAgent)) webReq.UserAgent = userAgent;
if (keepAlive.IsNotNull()) webReq.KeepAlive = (bool)keepAlive;
byte[] data = !String.IsNullOrEmpty(postData) ? postDataEncoding.GetBytes(postData) : postDataEncoding.GetBytes(String.Empty);
webReq.ContentLength = data.Length;
if (requestType.ToUpper() != "GET") {
Stream writer = webReq.GetRequestStream();
writer.Write(data, 0, data.Length);
writer.Close();
}
webResp = (HttpWebResponse)webReq.GetResponse();
string response;
using (var receiveStream = webResp.GetResponseStream()) {
using (var readStream = new StreamReader(receiveStream, encoding))
response = readStream.ReadToEnd();
}
return response;
} finally {
if (webResp.IsNotNull()) webResp.Close();
}
}
throw new Exception("必须指定一个有效的URL。");
}
