Due to SSL certificate issue we are using "Windows.Web.Http.HttpClient" API in my app service layer.
I referred below sample for my project.
http://code.msdn.microsoft.com/windowsapps/HttpClient-sample-55700664
How can we implement the timeout option in "Windows.Web.Http.HttpClient" API
You can use a CancellationTokenSource with a timeout.
HttpClient client = new HttpClient();
var cancellationTokenSource = new CancellationTokenSource(2000); //timeout
try
{
var response = await client.GetAsync("https://test.example.com", cancellationTokenSource.Token);
}
catch (TaskCanceledException ex)
{
}
Edit :
With Windows.Web.Http.HttpClient you should use the AsTask() extension method :
HttpClient client = new HttpClient();
System.Threading.CancellationTokenSource source = new System.Threading.CancellationTokenSource(2000);
try
{
client.GetAsync(new Uri("http://example.com")).AsTask(source.Token);
}
catch(TaskCanceledException ex)
{
}
Related
I am trying to call a get REST API from my tvOS application. Following is my code when tap the Button:
async void ButtonClicked(UIButton sender)
{
try
{
HttpClient client = new HttpClient();
var response = await client.GetAsync("rest api url");
if (response.IsSuccessStatusCode)
{
var Response = JsonConvert.DeserializeObject(await response.Content.ReadAsStringAsync());
if (!string.IsNullOrWhiteSpace(Response.ToString()))
{
var category = JsonConvert.DeserializeObject<Videos>(Response.ToString());
Debug.WriteLine("count:>>" + category.webContentCategoryList.Count);
}
}
}
catch(Exception e)
{
Debug.WriteLine("Exception:>>"+e);
}
I have installed the system.net.http and newtonsoft.json nuget packages. But when I run the project the application showing Main.cs file like below screenshot:
Am I missing something in this?
UPDATE
I have added breakpoint for the first line inside ButtonClicked function. When I taps the Button, the application showing Main.cs file like above screenshot. It is not hitting the first line of ButtonClicked function.
So the issue is something else, I am not an expert in tvOS applications so I can't figure out. I have uploaded a sample project here.
I have fixed this issue by separating the service call on a new function like below, new function is the async method:
partial void ButtonClicked(UIButton sender)
{
LoadData();
}
async void LoadData()
{
HttpClient client = new HttpClient();
var response = await client.GetAsync("service url");
if (response.IsSuccessStatusCode)
{
var Response = JsonConvert.DeserializeObject(await response.Content.ReadAsStringAsync());
if (!string.IsNullOrWhiteSpace(Response.ToString()))
{
var category = JsonConvert.DeserializeObject<Videos>(Response.ToString());
Debug.WriteLine("count:>>" + category.Count);
}
}
}
My XF Thread is here for more details.
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 have such code, that work on my Console Project in VS2012 for Desktop, but not work in VS2013 for WP8.
url = "http://lenta.ru/photo/2014/06/23/blackwidow/"
WebRequest request = WebRequest.Create(url);
WebResponse response = await request.GetResponseAsync(); /*from here programm doesn't work on wp8, but works on PC Console Project on VS2012*/
Stream data = response.GetResponseStream();
Why this code work on console project, but not work from my WP8 app?
fix.
Problem is solved by using HttpCLient instead of WebRequest.
HttpClient client = new HttpClient();
try
{
var result = await client.GetStringAsync(url);
}
catch
{
}
client.Dispose();
Problem is solved by using HttpCLient instead of WebRequest.
HttpClient client = new HttpClient();
try
{
var result = await client.GetStringAsync(url);
}
catch
{
}
client.Dispose();
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.
I have the following code. The async call never returns anything. Even for google.com.
try
{
using (
var client = new HttpClient()) {
var response = client.GetAsync("http://www.google.com");
Debug.WriteLine("Coming here1"+response.Result.IsSuccessStatusCode);
if (response.Result.IsSuccessStatusCode)
{
// by calling .Result you are performing a synchronous call
Debug.WriteLine("Coming here1");
var responseContent = response.Result.Content;
// by calling .Result you are synchronously reading the result
string responseString = responseContent.ReadAsStringAsync().Result;
//Console.WriteLine(responseString);
}
else { Debug.WriteLine("else"); }
}
}
catch(Exception e)
{
Debug.WriteLine(e.ToString());
}
}
Try This
try{
WebClient wc = new WebClient();
wc.DownloadStringCompleted+= (sender,args) => {
Debug.WriteLine(args.results);
};
wc.DownloadStringAsync(new Uri(#"http://www.Google.com",UriKind.RelativeOrAbsolute));
}
catch(Exception e){ Debug.WriteLine(e.Message); }
You don't appear to be awaiting your Async call.
Try changing var response = client.GetAsync("http://www.google.com"); to var response = await client.GetAsync("http://www.google.com");
Remember to mark your method as async.
you're also blocking on your async call ReadAsStringAsync().Result. As with client.GetAsync, make sure to await the call instead of blocking with Result. This blog post speaks a bit on the topic.
Read up a bit on async/await. You'll love it once you get the hang of it.