I have a JavaScriptHelper class with a custom WebPost method as follows:
public string WebPost(string url, string json)
{
#region
string responseData = "";
try
{
HttpWebRequest webRequest = System.Net.WebRequest.Create(url) as HttpWebRequest;
StreamWriter requestWriter = null;
webRequest.Method = "POST";
webRequest.ContentType = "application/json";
using (requestWriter = new StreamWriter(webRequest.GetRequestStream()))
{
requestWriter.Write(json);
}
using (StreamReader responseReader = new StreamReader(webRequest.GetResponse().GetResponseStream()))
{
responseData = responseReader.ReadToEnd();
}
webRequest = null;
}
catch (WebException ex)
{
LogBase.LogController.WriteError(ex);
}
catch (Exception ex)
{
LogBase.LogController.WriteError(ex);
}
return responseData;
#endregion
}
I use this to send a POST request to an ASP.NET WebAPI service as follows:
RegisterModel model = new RegisterModel();
model.email = "abc#gmail.com";
model.oAuthId = "11111111";
model.oAuthType = "Facebook";
string jsonStr = JsonConvert.SerializeObject(model);
string response = new JavaScriptHelper().WebPost("http://localhost:9091/api/Authentication/authenticateoauth", jsonStr);
The service receives this call. If the user exists, it returns the response, if it doesnt, it creates the user and returns the response.
The problem I am facing is that when the user exists, everything works fine. I get the response on the client (JSON). When it doesn't exists, it creates the user correctly on the server, but my client breaks off early and doesn't wait for a response. I get the following error:
System.Net.WebException was unhandled
HResult=-2146233079
Message=The remote server returned an error: (500) Internal Server Error.
Source=System
StackTrace:
at System.Net.HttpWebRequest.GetResponse()
How can I force my request to wait for a response a little longer?
Related
I am provided a webservice url similar to:
http://ericdev35:7280/persons/persons/
and a username and password.
I want to make a post call on this web service from WPF application.
The data to be sent to the service is the first name and last name of a person in the format:
"fname=Abc&lname=Xyz"
How can I make a call for this in C#?
Here is the code that I have tried:
HttpWebRequest httpWebRequest = (HttpWebRequest) WebRequest.Create("http://ericdev35:7280/persons/persons/");
httpWebRequest.Method = "POST";
httpWebRequest.ContentType = "application/json";
httpWebRequest.Credentials = new NetworkCredential(username, password);
string data = "fname=Abc&lname=Xyz";
StreamWriter writer = new StreamWriter(httpWebRequest.GetRequestStream());
writer.Write(data);
writer.Close();
This does not give me any error but I cannot see the data that I have posted. Is there anything that needs to be corrected?
Is the Content Type correct?
This Method posts json.
After that it gets the response and deserialize the Json Object.
private static string PostJson<T1>(string p_url, string p_json, string p_method, out T1 p_target)
{
var httpWebRequest = (HttpWebRequest)WebRequest.Create(p_url);
httpWebRequest.UseDefaultCredentials = true;
httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = p_method;
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
streamWriter.Write(p_json);
streamWriter.Flush();
streamWriter.Close();
}
HttpWebResponse httpResponse;
try
{
httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
}
catch (WebException ex)
{
httpResponse = ex.Response as HttpWebResponse;
}
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var a_result = streamReader.ReadToEnd();
//If you dont need a Json object delete anything behind here
try
{
p_target = JsonConvert.DeserializeObject<T1>(a_result);
}
catch { p_target = default(T1); }
return a_result;
}
}
I am writing an MVC Web API the make async HttpWebRequest calls. I am getting 2 different exceptions. Below is the method I am using.
The 1st exception is: "This stream does not support seek operations." and it is happening on the responseStream.
The 2nd exception is: "timeouts are not supported on this stream" and that is happening on the MemoryStream content.
What am I doing wrong? I have been Googling but not really finding any solution.
Thanks,
Rhonda
private async Task GetHtmlContentAsync(string requestUri, string userAgent, string referrer, bool keepAlive, TimeSpan timeout, bool forceTimeoutWhileReading, string proxy, string requestMethod, string type)
{
//string to hold Response
string output = null;
//create request object
var request = (HttpWebRequest)WebRequest.Create(requestUri);
var content = new MemoryStream();
request.Method = requestMethod;
request.KeepAlive = keepAlive;
request.Headers.Set("Pragma", "no-cache");
request.Timeout = (Int32)timeout.TotalMilliseconds;
request.ReadWriteTimeout = (Int32)timeout.TotalMilliseconds;
request.Referer = referrer;
request.Proxy = new WebProxy(proxy);
request.UserAgent = userAgent;
try
{
using (WebResponse response = await request.GetResponseAsync().ConfigureAwait(false))
{
using (Stream responseStream = response.GetResponseStream())
{
if (responseStream != null)
{
await responseStream.CopyToAsync(content);
}
}
var sr = new StreamReader(content);
output = sr.ReadToEnd();
sr.Close();
}
}
catch (Exception ex)
{
output = string.Empty;
var message = ("The API caused an exception in the " + type + ".\r\n " + requestUri + "\r\n" + ex);
Logger.Write(message);
}
return output;
}
I fixed the issue by adding
content.Position = 0
before new StreamReader line. Now I just need to get it work with GZip compression.
Rhonda
Saving data in windows phone received from WCF/web service .
The response may be received after sometime so how to handle this situation.
Saving data is no problem but How to handel if data is received late
You can use this code (show the code from my project):
public void sendPost(string postData, Action<MyResponse, Exception> callback, CreateResponse creater)
{
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(UrlRequest);
webRequest.Method = "POST";
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.Accept = "application/json";
webRequest.AllowAutoRedirect = true;
webRequest.BeginGetRequestStream(new AsyncCallback(getRequestStreamCallback), new Request()
{
HttpRequest = webRequest,
PostData = postData,
Url = UrlRequest,
CallBack = callback,
Creater = creater
});
}
private void getRequestStreamCallback(IAsyncResult asynchronousResult)
{
var request = (Request)asynchronousResult.AsyncState;
// End the stream request operation
Stream postStream = request.HttpRequest.EndGetRequestStream(asynchronousResult);
byte[] byteArray = Encoding.UTF8.GetBytes(request.PostData);
// Add the post data to the web request
postStream.Write(byteArray, 0, byteArray.Length);
postStream.Close();
// Start the web request
request.HttpRequest.BeginGetResponse(new AsyncCallback(getResponseCallback), request);
}
private void getResponseCallback(IAsyncResult asynchronousResult)
{
var request = (Request)asynchronousResult.AsyncState;
try
{
HttpWebResponse response;
// End the get response operation
response = (HttpWebResponse)request.HttpRequest.EndGetResponse(asynchronousResult);
Stream streamResponse = response.GetResponseStream();
StreamReader streamReader = new StreamReader(streamResponse);
var myResponse = streamReader.ReadToEnd();
streamResponse.Close();
streamReader.Close();
response.Close();
MyResponse response_obj = request.Creater.CreateResponseObj();
using (MemoryStream stream = new MemoryStream(Encoding.Unicode.GetBytes(myResponse)))
{
DataContractJsonSerializer serializer = new DataContractJsonSerializer(response_obj.GetType());
response_obj = (GYResponse)serializer.ReadObject(stream);
if (request.CallBack != null)
{
request.CallBack.Invoke(response_obj, null);
}
}
}
catch (WebException e)
{
if (request.CallBack != null)
{
request.CallBack.Invoke(null, e);
}
}
}
public void getInfo(string uid, Action<MyResponse, Exception> callback)
{
CreateResponse creater = new CreateResponseGetInfo();
string model = "User";
string method = "getInfo";
Params parametrs = new Params();
parametrs.Uid = uid;
//create yor request
string request = getRequestString(model, method, parametrs, Atoken);
sendPost(request, callback, creater);
}
So, you call method, which send request to web service postRequester.getInfo(uid, ResponseHandler) and use delegate for processing result.
private void ResponseHandler(MyResponse result, Exception error)
{
if (error != null)
{
string err = error.Message;
return;
}
else
{
var infoResponse = result as ResponseGetInfo;
if (infoResponse != null)
{
//result processing..
}
}
}
All the web requests you make in a Windows Phone app are Asynchronous. That means, you make a web request from your app and attach a handler to handle the response when it comes. In the response handler, you will have to take care of the response and do whatever you want with it.
Check this link Using WebClient and HttpWebRequest
I have a page containing links to some files.
I basically need to access the source of the page for parsing it then and obtaining all the hyperlinks to the files.
My code is something like this (some piece of code I've found in many places on the net ..):
"private static byte[] ReadImageFromUrl(string url)
{
var myReq = (HttpWebRequest)WebRequest.Create(url);
myReq.Timeout = 10000;
WebResponse myResp = myReq.GetResponse();
Stream stream = myResp.GetResponseStream();
List<byte> bytesList = new List<byte>();
using (var br = new BinaryReader(stream))
{
try
{
while (true)
{
var b = br.ReadByte();
bytesList.Add(b);
}
}
catch (Exception)
{}
br.Close();
}
myResp.Close();
return bytesList.ToArray();
}"
Now the problem is I get "System.Net.WebException: The remote server returned an error: (500) Internal Server Error." when calling "myReq.GetResponse()" - examining the error I see that the status is 'ProtocolError'.
The response property of the WebException object contains some server error ..(although when opening it from the browser it opens correctly) ...also when I call this function with the url of one of my files I get the same ProtocolError status, but the 404 error ...
Please give any hint how could I solve it... or any other possibility of accomplishing this task.
Thanks !
My new code after using Fiddler is:
private static byte[] ReadFileFromUrl(string url)
{
var myReq = (HttpWebRequest)WebRequest.Create(url);
myReq.Accept = const_AcceptHeader;
myReq.Headers.Set(const_AcceptLanguageHeaderName, const_AcceptLanguageHeader);
myReq.UserAgent = const_AcceptUserAgentHeader;
myReq.CookieContainer = new CookieContainer();
myReq.KeepAlive = true;
myReq.Timeout = Int32.Parse(ConfigSettings.RequestPageTimeout) * 1000;
WebResponse myResp = null;
List<byte> bytesList = null;
myResp = myReq.GetResponse();
Stream stream = myResp.GetResponseStream();
bytesList = new List<byte>();
using (var br = new BinaryReader(stream))
{
try
{
while (true)
{
var b = br.ReadByte();
bytesList.Add(b);
}
}
catch (Exception ex)
{
throw;
}
br.Close();
}
return bytesList.ToArray();
}
All variables that start with const_ are taken from Fiddler.
Well, I solved that using Fiddler ... I passed to my request object the headers as I have seen them in Fiddler ...& it worked, no error
I am trying to consume wcf restful service. The code is as follows:
private static string SendRequest(string uri, string method, string contentType, string body)
{
string responseBody = null;
HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(uri);
req.Method = method;
if (!String.IsNullOrEmpty(contentType))
{
req.ContentType = contentType;
}
if (body != null)
{
byte[] bodyBytes = Encoding.UTF8.GetBytes(body);
req.GetRequestStream().Write(bodyBytes, 0, bodyBytes.Length);
req.GetRequestStream().Close();
}
req.Accept = "*/*";
HttpWebResponse resp;
resp = (HttpWebResponse)req.GetResponse();
return responseBody;
}
Now the issue is, sometimes it works fine and sometimes i get the error
"the remote server returned an error 403 forbidden."
I cannot figure out why it fails. Any idea???