我正在使用
WPF .net 4.0应用程序.我有一个搜索栏.对于每个搜索令牌,我需要对8个单独的URL执行8个http请求以获取搜索结果.一旦用户停止在搜索栏中输入,我会在400毫秒后向服务器发送8个请求.搜索6到7个搜索令牌的结果非常好.但在那之后突然HttpWebRequest停止了默默工作.没有例外,没有收到任何回复.我正在使用
Windows 7,我也禁用了防火墙.我不知道后续的http请求丢失在哪里.
任何人都可以向我展示灯来解决这个问题吗？
public static void SendReq(string url)
{
// Create a new HttpWebRequest object.
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.ContentType = "application/x-www-form-urlencoded";
request.Proxy = new WebProxy("192.168.1.1",8000);
// Set the Method property to 'POST' to post data to the URI.
request.Method = "POST";
// start the asynchronous operation
request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback),request);
}
private static void GetRequestStreamCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
// End the operation
Stream postStream = request.EndGetRequestStream(asynchronousResult);
string postData = this.PostData;
// Convert the string into a byte array.
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
// Write to the request stream.
postStream.Write(byteArray,byteArray.Length);
postStream.Close();
// Start the asynchronous operation to get the response
request.BeginGetResponse(new AsyncCallback(GetResponseCallback),request);
}
private static void GetResponseCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
// End the operation
using(HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult))
{
using(Stream streamResponse = response.GetResponseStream())
{
using(StreamReader streamRead = new StreamReader(streamResponse))
{
string responseString = streamRead.ReadToEnd();
Debug.WriteLine(responseString);
}
}
}
}
解决方法
我想我已经很晚了,但我仍然想回答你的问题,可能对别人有帮助.默认情况下,您发出的HTTP请求是HTTP 1.1请求.默认情况下,HTTP 1.1请求具有Keep-Alive连接.所以当你向同一个服务器.net框架提出太多请求时,只需要x不.请求.
你应该通过response.Close()关闭你的所有响应
您还可以指定可以同时发出的请求数.
ServicePointManager.DefaultConnectionLimit = 20;
请注意,您必须在第一个请求之前设置DefaultConnectionLimit.你可以找到更多信息
here on msdn.
