i have the following code that uploads a photo to a web service , i need to get the response from the service , and i'm using httpclient class here's my code
var fileUploadUrl = Globals.baseUrl + "/laravelProjects/VisWall/public/test";
var client = new HttpClient();
photoStream.Position = 0;
MultipartFormDataContent content = new MultipartFormDataContent();
content.Add(new StreamContent(photoStream), "image", "koko");
await client.PostAsync(fileUploadUrl, content).ContinueWith((postTask) =>
{
postTask.Result.EnsureSuccessStatusCode();
});
}
i've just found the answer you shoud read string async from the results content
string stringResponse =await postTask.Content.ReadAsStringAsync();
Related
We are getting 502 error when we try to send photo in Json.
App developed with .NET and Xamarin.Form
var jsonObjGuid = JsonConvert.SerializeObject(ObjGuid);
var jsonObjFiles = JsonConvert.SerializeObject(ObjFiles, Formatting.Indented);
var url = $"{ Session.EndpointURL}{MethodNames.UploadDossierFiles.Value}";
try
{
using (HttpClient httpClient = new HttpClient())
{
httpClient.DefaultRequestHeaders.TransferEncodingChunked = true;
httpClient.Timeout = TimeSpan.FromMilliseconds(600000);
using (HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, url))
{
//request.Headers.Add(HeaderKeys.UserAgent.Value, Resources.DefaultUserAgent);
request.Headers.Add(HeaderKeys.UserAgent.Value, "MobileApp");
request.Headers.Add(HeaderKeys.Token.Value, token);
HttpContent ObjGuidContent = new StringContent(jsonObjGuid);
HttpContent ObjFilesContent = new StringContent(jsonObjFiles);
MultipartFormDataContent content = new MultipartFormDataContent
{
{ObjGuidContent, "ObjGuid"},
{ObjFilesContent, "ObjFiles"}
};
request.Content = content;
var response = await Policy.HandleResult<HttpResponseMessage>(message => !message.IsSuccessStatusCode)
.WaitAndRetryAsync(3, i => TimeSpan.FromSeconds(2), (result, timeSpan, retryCount, context) => { })
.ExecuteAsync(() => httpClient.SendAsync(request));
}
}
}
Sometimes it works but often I get this error.
Any help, suggestions? What do I need to check?
I am making an app which can upload image to a server (the server works well), and I use this method to upload my image to it, but when I get the respond from the result, it return a null string, can you explain for me what did I do wrong.
I followed this method: How to upload file to server with HTTP POST multipart/form-data
HttpClient httpClient = new HttpClient();
MultipartFormDataContent form = new MultipartFormDataContent();
form.Headers.ContentType = new MediaTypeHeaderValue("multipart/form-data");
byte[] bytes = await Converter.GetBytesAsync(storageFile);
form.Add(new ByteArrayContent(bytes, 0, bytes.Count()), "\"upload-file\"", "\"test.jpg\"");
HttpResponseMessage response = await httpClient.PostAsync("my-url", form);
response.EnsureSuccessStatusCode();
httpClient.Dispose();
string sd = response.Content.ReadAsStringAsync().Result;
Debug.WriteLine("res: " + sd); // this return a null string
The request return like this:
--a81d2efe-5f2e-4f84-83b9-261329bee20b
Content-Disposition: form-data; name="upload-file"; filename="test.jpg"; filename*=utf-8''%22test.jpg%22
����Ivg?�aEQ�.�����(��9%�=��>�C�~/�QG$�֨������(�`������QE��Z��
Can you help me please!
P/s: Here is my convert method
public static async Task<byte[]> GetBytesAsync(StorageFile file)
{
byte[] fileBytes = null;
if (file == null) return null;
using (var stream = await file.OpenReadAsync())
{
fileBytes = new byte[stream.Size];
using (var reader = new DataReader(stream))
{
await reader.LoadAsync((uint)stream.Size);
reader.ReadBytes(fileBytes);
}
}
return fileBytes;
}
This might help
private async Task<string> UploadImage(StorageFile file)
{
HttpClient client = new HttpClient();
MultipartFormDataContent form = new MultipartFormDataContent();
HttpContent content = new StringContent("fileToUpload");
form.Add(content, "fileToUpload");
var stream = await file.OpenStreamForReadAsync();
content = new StreamContent(stream);
content.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data")
{
Name = "fileToUpload",
FileName = file.Name
};
form.Add(content);
var response = await client.PostAsync("my-url", form);
return response.Content.ReadAsStringAsync().Result;
}
Use ByteArrayContent instead of StringContent. That Should work.
And if you are expecting a stream-response you should use ReadAsStreamAsync instaed of ReadAsStringAsync.
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 have to send the cookies to server for every subsequent HTTPWebRequest. My code goes below.
class APIManager
{
CookieContainer cookieJar = new CookieContainer();
CookieCollection responseCookies = new CookieCollection();
private async Task<string> httpRequest(HttpWebRequest request)
{
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))
{
cookieJar = request.CookieContainer;
responseCookies = response.Cookies;
received = await sr.ReadToEndAsync();
}
}
}
return received;
}
public async Task<string> Get(string path)
{
var request = WebRequest.Create(new Uri(path)) as HttpWebRequest;
request.CookieContainer = cookieJar;
return await httpRequest(request);
}
public async Task<string> Post(string path, string postdata)
{
var request = WebRequest.Create(new Uri(path)) as HttpWebRequest;
request.Method = "POST";
request.CookieContainer = cookieJar;
byte[] data = Encoding.UTF8.GetBytes(postdata);
using (var requestStream = await Task<Stream>.Factory.FromAsync(request.BeginGetRequestStream, request.EndGetRequestStream, null))
{
await requestStream.WriteAsync(data, 0, data.Length);
}
return await httpRequest(request);
}
}
Every time i ask for the question people say that i have to set the cookie container with request by following code line.
request.CookieContainer = cookieJar;
and i used it but still server returns the 'token does not match' error. Do i need to talk to the vendor for it?
Following image shows my problem and requirement.
I haven't seen you do something with the cookieJar !
//Create the cookie container and add a cookie.
request.CookieContainer = new CookieContainer();
// This example shows manually adding a cookie, but you would most
// likely read the cookies from isolated storage.
request.CookieContainer.Add(new Uri("http://api.search.live.net"),
new Cookie("id", "1234"));
cookieJar in your APIManager is a member, everytime your instance APIManager, the cookieJar is a new instance. you need to make sure cookieJar contains what the website needs.
you can have a look at this How to: Get and Set Cookies