Question

我正在创建一个WCF REST Web服务，用于下载大文件（可能超过2GB）。这些文件是未存储在硬盘驱动器上的csv文件，而是在发出请求时在运行时形成。因此我选择将csv文件直接写入HttpResponse，避免任何不能容纳2GB以上数据的中间容器。这是我编写的测试代码，它完成了我所描述的内容：

[ServiceContract]
public interface IDownloadService
{
    [OperationContract]
    [WebInvoke(
        Method = "GET",
        RequestFormat = WebMessageFormat.Json,
        ResponseFormat = WebMessageFormat.Json,
        UriTemplate = "")]
    void Download();
}

public class DownloadService : IDownloadService
{
    public void Download()
    {
        var response = HttpContext.Current.Response;
        response.Clear();
        response.ContentType = "application/csv";
        response.AddHeader("Content-Disposition", "attachment; filename=myfile.csv");

        //This is a small test csv file, it will be replaced with a big file,
        //that will be formed in runtime and written piece by piece into Response.OutputStream
        response.BinaryWrite(System.Text.Encoding.UTF8.GetBytes("1,2,3"));
        response.Flush();
        response.Close();
        response.End();
    }
}

这是我的Web.config，以防万一：

<?xml version="1.0"?>
<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.6.1" />
    <httpRuntime targetFramework="4.6.1"/>
  </system.web>
  <system.serviceModel>
    <behaviors>
      <endpointBehaviors>
        <behavior name="web">
          <webHttp />
        </behavior>
      </endpointBehaviors>
    </behaviors>
    <services>
      <service name="RestWcf.DownloadService">
        <endpoint address="" binding="webHttpBinding" behaviorConfiguration="web" contract="RestWcf.IDownloadService"/>
      </service>
    </services>   
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
  </system.serviceModel>
</configuration>

现在，当我从Google Chrome调用此网络服务方法时，这是有趣的部分，首先它开始下载文件，在下载结束时，当我尝试拨打电话时，Chrome会向我显示错误Failed - Network error它来自Postman我收到Could not get any response消息而没有生成任何响应，最后当我尝试从Fiddler调用它时，我得到了504回复，其中包含更多信息性消息ReadResponse() failed: The server did not return a complete response for this request. Server returned 384 bytes.

关于这里发生了什么的任何想法以及如何解决这种奇怪的行为？

直接写入HttpResponse时WCF REST失败网络错误

0 个答案: