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我使用http://visualstudiogallery.msdn.microsoft.com/fbc7e5c1-a0d2-41bd-9d7b-e54c845394cd创建了一个 Web 服务。我将它托管在我的 IIS 上并创建了一个测试应用程序，该应用程序部署在 IIS 上并且可以正常工作。现在，我托管了这个 WCF 服务并尝试从 localhost 使用/使用它，但它在以下行中给出了错误：

var response = request.GetResponse() as HttpWebResponse;

错误是

The remote server returned an error: (504) Gateway Timeout.

在提琴手它显示：

Fiddler] ReadResponse() 失败：服务器没有为此请求返回响应。 

request header in fiddler is:

POST /Notifications/RecordingCompleted HTTP/1.1

Entity:

Content-Length: 792
Content-Type: application/json

Transport
Connection: Keep-Alive
Expect: 100-continue

代码是：

string serviceBaseUrl = serviceurlhere string conversationId = 2342423 string resourceUrl = ""; 字符串方法=“POST”；string jsonText = "这里是 JSON";

       string success = UseHttpWebApproach(serviceBaseUrl, resourceUrl, method, jsonText);

 private string UseHttpWebApproach(string serviceUrl, string resourceUrl, string method, string requestBody)
        {
            string responseMessage = null;
            var request = WebRequest.Create(string.Concat(serviceUrl, resourceUrl)) as HttpWebRequest;
            if (request != null)
            {
                request.ContentType = "application/json";
                request.Method = method;                 
            }

            //var objContent = HttpContentExtensions.CreateDataContract(requestBody);
            if (method == "POST" && requestBody != null)
            {
                byte[] requestBodyBytes = ToByteArrayUsingJsonContractSer(requestBody);
                request.ContentLength = requestBodyBytes.Length;
                using (Stream postStream = request.GetRequestStream())
                    postStream.Write(requestBodyBytes, 0, requestBodyBytes.Length);

            }

            if (request != null)
            {
                var response = request.GetResponse() as HttpWebResponse;
                if (response.StatusCode == HttpStatusCode.OK)
                {
                    Stream responseStream = response.GetResponseStream();
                    if (responseStream != null)
                    {
                        var reader = new StreamReader(responseStream);

                        responseMessage = reader.ReadToEnd();
                    }
                }
                else
                {
                    responseMessage = response.StatusDescription;
                }
            }
            return responseMessage;
        }

private static byte[] ToByteArrayUsingJsonContractSer(string requestBody)
{
    byte[] bytes = null;
    var serializer1 = new DataContractJsonSerializer(typeof(string));
    var ms1 = new MemoryStream();
    serializer1.WriteObject(ms1, requestBody);
    ms1.Position = 0;
    var reader = new StreamReader(ms1);
    bytes = ms1.ToArray();
    return bytes;
}

服务代码为：

 [ServiceContract]
    [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
    [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]    
    public class RecordingCompleted
    {

        [WebInvoke(UriTemplate = "", Method = "POST")]
        public string ProcessCall(string JsonData)
        {

return string result
}

}
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