I tried everything and I can not understand why this error occurs.
Background : I have an iPad application written in MonoTouch, and I have a stream that runs in the background, and every 15 seconds I synchronize data with the server. This works the first few iterations of the stream, but in the end I get the following stack trace.
An exception occured: System.Net.WebException: Error getting response stream (ReadDone4): ServerProtocolViolation ---> System.FormatException: Input string was not in the correct format
at System.UInt32.Parse (System.String s) [0x00010] in /Developer/MonoTouch/Source/mono/mcs/class/corlib/System/UInt32.cs:405
at System.Net.WebConnection.GetResponse (System.Byte[] buffer, Int32 max) [0x000ba] in /Developer/MonoTouch/Source/mono/mcs/class/System/System.Net/WebConnection.cs:565
at System.Net.WebConnection.ReadDone (IAsyncResult result) [0x00095] in /Developer/MonoTouch/Source/mono/mcs/class/System/System.Net/WebConnection.cs:446
--- End of inner exception stack trace ---
at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x0005e] in /Developer/MonoTouch/Source/mono/mcs/class/System/System.Net/HttpWebRequest.cs:819
at System.Net.HttpWebRequest.GetResponse () [0x0000e] in /Developer/MonoTouch/Source/mono/mcs/class/System/System.Net/HttpWebRequest.cs:827
at SyncService.REST.RestClient.Execute[IEnumerable`1] (SyncService.REST.RestRequest request) [0x00079] in /Users/Chris/Compass/SyncService/REST/RestClient.cs:42
I am talking to the default IIS web server . Here is the method I'm calling:
public RestResponse<T> Execute<T>(RestRequest request){
var restResponse = new RestResponse<T>();
var serializer = new JavaScriptSerializer();
var urlPath = _baseUrl + "/" + request.Resource;
var httpRequest = (HttpWebRequest)HttpWebRequest.Create(new Uri(urlPath));
httpRequest.Headers = request.Headers;
Authenticator.Authenticate(httpRequest);
httpRequest.Method = request.Method.ToString();
if (request.Method == Method.POST)
SetPostData(httpRequest, request);
HttpWebResponse httpResponse = null;
try{
httpResponse = (HttpWebResponse) httpRequest.GetResponse();
var reader = new StreamReader(httpResponse.GetResponseStream());
var responseString = reader.ReadToEnd();
reader.Close();
restResponse.StatusCode = httpResponse.StatusCode;
restResponse.Headers = httpResponse.Headers;
restResponse.Data = serializer.Deserialize<T>(responseString);
restResponse.ResponseStatus = ResponseStatus.Completed;
}
catch(WebException e){
restResponse.ResponseStatus = ResponseStatus.Error;
restResponse.ErrorMessage = e.Message;
restResponse.ErrorException = e;
var webResponse = (HttpWebResponse) e.Response;
if (webResponse != null){
restResponse.StatusCode = webResponse.StatusCode;
restResponse.Headers = webResponse.Headers;
}
if (restResponse.StatusCode != HttpStatusCode.NotModified)
Console.WriteLine("An exception occured: " + e + "\r\n");
}catch (Exception ex) {
restResponse.ResponseStatus = ResponseStatus.Error;
restResponse.ErrorMessage = ex.Message;
restResponse.ErrorException = ex;
}
if (httpResponse != null)
httpResponse.Close();
return restResponse;
}
Please, help. I do not know what to do. Google doesn’t show anything.
I can make 22 successful requests before an error occurs.
EDIT
I narrowed it down to be a server problem. This is asp.net MVC, and the exception only occurs when sending 304 to the client. See Server Code:
private void ServeHttpStatusCode() {
Response.StatusCode = 304;
Response.Status = "304 Not Modified";
Response.StatusDescription = "The resource you are requesting has not been modified";
Response.ContentType = "application/json";
Response.Write("{\"Error\":\"The resource you are requesting has not been modified\"}");
Response.End();
Response.Close();
}