HttpClient.SendAsync HttpException:客户端断开连接

本文关键字：断开 连接 客户端 SendAsync HttpException HttpClient | 更新日期: 2023-09-27 18:14:53

我有一个ASP。. NET web API应用程序托管在Windows Azure web角色中。此应用程序的目的是代理Http请求到其他启用web的端点-如服务总线中继，并返回他们的响应。

有时，我们的应用程序在发送具有较大负载(>5MB)的请求时抛出异常。对于大负载的请求，这可能在20个请求中发生1个。

Exception Details: System。AggregateException:一个或多个错误发生。--> System.Web.HttpException: The client disconnected.
System.Web.Hosting.IIS7WorkerRequest.EndRead (IAsyncResultasyncResult)System.Web.HttpBufferlessInputStream。EndRead (IAsyncResult asyncResult)System.Net.Http.StreamToStreamCopy.BufferReadCallback (IAsyncResult——内部异常堆栈跟踪结束——-->(内部异常#0)System.Web.HttpException (0x800703E3):客户端断开连接。在System.Web.Hosting.IIS7WorkerRequest。EndRead (IAsyncResult asyncResult)System.Web.HttpBufferlessInputStream.EndRead (IAsyncResultasyncResult)System.Net.Http.StreamToStreamCopy.BufferReadCallback (IAsyncResult基于"增大化现实"技术)& lt; -;TraceSource 'w3wp.exe'事件

我们使用。net 4.5中的System.Net.HttpClient发送这些Http请求。

public class ProxyController : ApiController
{
    private static readonly HttpClient HttpClient = new HttpClient();
    private static readonly Uri BaseUri = new Uri("http://webendpoint.com");
    public HttpResponseMessage Post()
    {
        var newUri = new Uri(BaseUri, Request.RequestUri.PathAndQuery);
        var request = new HttpRequestMessage(HttpMethod.Post, newUri)
                {
                    Content = this.Request.Content
                };
        var task = HttpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead);
        task.Wait();
        var response = task.Result;
        return new HttpResponseMessage(response.StatusCode)
        {
            Content = new PushStreamContent((stream, content, ctx) =>
            {
                var tempStream = response.Content.ReadAsStreamAsync().Result;
                tempStream.CopyToAsync(stream).Wait();
                stream.Flush();
                stream.Close();
            })
        };
    }
}

有什么想法可以导致这个问题吗?

HttpClient.SendAsync HttpException:客户端断开连接

尝试返回Task版本，然后将同步代码替换为async。没有了。"结果"的东西，而不是使用"await"关键字，并把" async "关键字在你的方法。像这样:

public class ProxyController : ApiController
{
    private static readonly HttpClient HttpClient = new HttpClient();
    private static readonly Uri BaseUri = new Uri("http://webendpoint.com");
    public async Task<HttpResponseMessage> Post()
    {
        var newUri = new Uri(BaseUri, Request.RequestUri.PathAndQuery);
        var request = new HttpRequestMessage(HttpMethod.Post, newUri)
        {
            Content = Request.Content
        };
        var response = await HttpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead);
        return new HttpResponseMessage(response.StatusCode)
        {
            Content = new PushStreamContent(async (stream, content, ctx) =>
            {
                var tempStream = await response.Content.ReadAsStreamAsync();
                await tempStream.CopyToAsync(stream);
                stream.Flush();
                stream.Close();
            })
        };
    }
}
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