Iam new to windows phone 8.1 app developement.i got stuck in getting response from API using httpclient get request..can anybody tell the best way to perform the get request from server in windows phone 8.1..thanks in advance
hope the below helps
try{
var client = new HttpClient();
var uri = new Uri("your URI");
//Call. Get response by Async
var Response = await client.GetAsync(uri);
//Result & Code
var statusCode = Response.StatusCode;
//If Response is not Http 200
//then EnsureSuccessStatusCode will throw an exception
Response.EnsureSuccessStatusCode();
//Read the content of the response.
//In here expected response is a string.
//Accroding to Response you can change the Reading method.
//like ReadAsStreamAsync etc..
var ResponseText = await Response.Content.ReadAsStringAsync();
}
catch(Exception ex)
{
//...
}
Related
HTTP "POST" data with login credentials to the BASEn server using API URL, in response it is giving a status 200, OK.
var values = new List<KeyValuePair<string, string>>
{
new KeyValuePair<string, string>("mode", "login"),
new KeyValuePair<string, string>("user", logintxtbx.Text),
new KeyValuePair<string, string>("password", passtxtbx.Text)
};
httpClient = new HttpClient(new HttpClientHandler());
HttpResponseMessage response = await httpClient.PostAsync("https://xx-yyy.com/auth", new FormUrlEncodedContent(values)); var strin = response.StatusCode.ToString();
var responseString = await response.Content.ReadAsStringAsync();
MessageBox.Show("login Success");
GetFullResponse(httpClient);
}
After validating my credentials, the server will create a session to me if i try to do "GET" HTTP by using another urls, it should gives my required data but this thing was not happening, every time iam getting "403" forbidden response.
This is the code using for "GET" data.
var uri = new Uri("https://xx-yyy.com/_ua/web/web/v1/xyz/?xyx=1431369000000&end=1431436740000&_=1431436741550");
var Response = await httpClient.GetAsync(uri);
var statusCode = Response.StatusCode;
Response.EnsureSuccessStatusCode()
var ResponseText = await Response.Content.ReadAsStringAsync();
i don't know whats wrong, i was doing.
Can any one suggest me how can i do this to be happen.
var handler = new HttpClientHandler();
var cookieContainer = handler.CookieContainer;
var client = new HttpClient(handler);
store cookies using cookieContainer and use them to authenticate the future calls using the same way as on web.
Store the cookies to the phone using IsolatedStorageSettings
Reference for more details here
i'm trying to send a photo to a server using httpclient class but every time i try i get a 0 byte file , here's my code for sending the image
if (e.ChosenPhoto != null)
{
var fileUploadUrl = Globals.baseUrl + "/laravelProjects/VisWall/public/test2";
var client = new HttpClient();
photoStream.Position = 0;
MultipartFormDataContent content = new MultipartFormDataContent();
content.Add(new StreamContent(e.ChosenPhoto), "image", fileName);
HttpResponseMessage result = new HttpResponseMessage();
await client.PostAsync(fileUploadUrl, content).ContinueWith((postTask) =>
{
try
{
result = postTask.Result.EnsureSuccessStatusCode();
}
catch (Exception exc)
{
MessageBox.Show("errorrrrrr");
}
});
}
i've also checked the length of e.ChoosenPhoto and it's not 0
try this piece of code by using MultipartFormDataContent:
HttpClient httpClient = new HttpClient();
MultipartFormDataContent form = new MultipartFormDataContent();
form.Add(new StringContent(token), "token");
var imageForm = new ByteArrayContent(imagen, 0, imagen.Count());
imagenForm.Headers.ContentType = new MediaTypeHeaderValue("image/jpg");
form.Add(imagenForm, "image", "nameholder.jpg");
HttpResponseMessage response = await httpClient.PostAsync("your_url_here", form);
response.EnsureSuccessStatusCode();
httpClient.Dispose();
string result = response.Content.ReadAsStringAsync().Result;
You could refer these too:
Uploading image and data as multi part content - windows phone 8
How to upload file to server with HTTP POST multipart/form-data
There are plenty of samples out there, which I've not mentioned here. It would be great if you could give a search before you post here.
I am building my first windowsPhone 8.1 application ,the role of my application is to create connection with server to get information from it, so I am writing the code to do this process by sending json-rpc request to server to get some information ,I am successful to get it in first time but when I send the second request I am receiving an empty response with 404 error (page not found).
But when I call the service without https (http only) it works fine regardless how many time I call it !
public async Task<string> GetDataFromServer(string urlToCall, string JSONData,string RR)
{
string UserName = “XXXXXXX”
string Password = "XXX";
using ( var handler = new HttpClientHandler())
{
handler.Credentials = new NetworkCredential(UserName, Password);
HttpClient client = new HttpClient(handler);
HttpResponseMessage response = null;
try
{
response = await client.PostAsync(urlToCall, new StringContent(JSONData.ToString(), Encoding.UTF8, " application/json"));
string res = response.Content.ReadAsStringAsync().Result;
Windows.UI.Popups.MessageDialog g = new Windows.UI.Popups.MessageDialog(res);
await g.ShowAsync();
return res;
}
catch (Exception ex)
{
Windows.UI.Popups.MessageDialog g = new Windows.UI.Popups.MessageDialog("Error is : " + ex.Message);
g.ShowAsync();
return "Error";
}
finally
{
response.Dispose();
client.CancelPendingRequests();
client.Dispose();
handler.Dispose();
}
}
}
Again, when call the URL of service (start with https) on first time I got response with seeked data, but second time I receive an empty response with 404 error (page not found) !!
Any help please
Please try to use this solution.
public async Task<string> SendJSONData3(string urlToCall, string JSONData)
{
string UserName = "XXXXXXXXX";
string Password = "XXXXXXXXX";
var httpWebRequest = (HttpWebRequest)WebRequest.Create(urlToCall);
httpWebRequest.Credentials = new NetworkCredential(UserName, Password);
httpWebRequest.ContentType = "text/json";
httpWebRequest.Method = "POST";
using (var streamWriter = new StreamWriter(await httpWebRequest.GetRequestStreamAsync()))
{
string json = JSONData;
streamWriter.Write(json);
streamWriter.Flush();
}
var httpResponse = (HttpWebResponse)await httpWebRequest.GetResponseAsync();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
return result;
}
}
A couple of ideas:
Do not use the .Result property. Just use await instead to avoid deadlocks.
Remove the additional space in front of the media type parameter " application/json"
Enable logging on the webserver and see if the second request arrives on the server.
Get a network trace, for example with Wireshark or Fiddler.
Try puting WebRequest.RegisterPrefix("https://", WebRequestCreator.ClientHttp); in your initialization code, as proposed in this answer.
HttpWebRequest in Windows phone 8
I am developing a windows phone 8 app using c#/xaml. I am facing some issues with httpwebrequest class. I want to download data from server using post method.But httpwebrequest is not working as expected. It is returning error (The remote server returned an error: NotFound) when i try to call webservices subsequently. What could be the reason?. Please help...Following is my code.
string response = "";
httpwebrequest = WebRequest.Create(new Uri(serviceurl)) as HttpWebRequest;
httpwebrequest.Method = "POST";
httpwebrequest.ContentType = "application/json";
byte[] data = Serialization.SerializeData(request);
using (var requestStream = await Task<Stream>.Factory.FromAsync(httpwebrequest.BeginGetRequestStream, httpwebrequest.EndGetRequestStream, null))
{
await requestStream.WriteAsync(data, 0, data.Length);
}
response = await httpRequest(httpwebrequest);
var result = Serialization.Deserialize<T>(response);
return result;
}
public async Task<string> httpRequest(HttpWebRequest request)
{
try
{
string received;
using (var response = (HttpWebResponse)(await Task<WebResponse>.Factory.FromAsync(request.BeginGetResponse, request.EndGetResponse, null)))
{
using (var responseStream = response.GetResponseStream())
{
using (var sr = new StreamReader(responseStream))
{
received = await sr.ReadToEndAsync();
}
}
response.Close();
}
return received;
}
catch(Exception ex)
{
return "";
}
}
Have you checked the inner exception? Because i had a similar problem an when i checked the inner exception i found that i got another error from the server. Check also the real http status code into the response header.
I am developing an iOS Application using MonoTouch. The application collects its data from a web service, using this code:
private static string getResult (string url)
{
string result;
var request = HttpWebRequest.Create (url);
request.ContentType = "application/json";
request.Method = "POST";
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
if (response.StatusCode != HttpStatusCode.OK)
Console.Out.WriteLine("Error fetching data. Server returned status code: {0}", response.StatusCode);
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
result = reader.ReadToEnd();
}
}
return result;
}
And this works fine, BUT when the json string returned from the Web Service reaches a certain size, the request returns with Internal server error 500. I have tried to invoke the service method directly in a web browser, and this returns a json string as expected. Why will it not work with my code, and is there a way to fix this?
Update:
I think this might solve my problem: http://forums.iis.net/t/1176077.aspx/1
Try Increasing Time Out for your service request. Your service must be timing out resulting 500 error
Also check this http://www.checkupdown.com/status/E500.html