I am trying to call a method on a controller from my main project via a console from the client. Trying to send putdata through to the controller.
Here is what I tried
case "6": //PUT data (Data Controller) must already exist...
Console.WriteLine("Please enter the ID of the song to be uploaded");
string putdata = Console.ReadLine();
//request for method url in WEBSITE B
var request = (HttpWebRequest)WebRequest.Create("http://localhost:61381/DataController/Put");
var data = Encoding.ASCII.GetBytes(putdata);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
using (var stream = request.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
var response5 = (HttpWebResponse)request.GetResponse();
var responseString = new StreamReader(response5.GetResponseStream()).ReadToEnd();
break;
}
Error is in the request, throws a null exception. Cannot find the controller, I am not sure how to point this correctly.
Related
I am using Lymbix client library for sentiment analysis.
When I run the code I am getting an error in (WebResponse)httpRequest.GetResponse(): 401-Unauthorized
(available at https://github.com/lymbix/.NET-Wrapper)
The function containing 401 error is given below:
private static string Post(string url, string data, List<string> headers)
{
HttpWebRequest httpRequest = (HttpWebRequest)HttpWebRequest.Create(url);
httpRequest.Method = "POST";
httpRequest.Accept = "application/json";
httpRequest.ContentType = "application/x-www-form-urlencoded";
if (headers != null)
{
foreach (string header in headers)
{
httpRequest.Headers.Add(header);
}
}
// write request?
byte[] postData = Encoding.UTF8.GetBytes(data.ToString());
httpRequest.ContentLength = postData.Length;
httpRequest.GetRequestStream().Write(postData, 0, postData.Length);
// read response
WebResponse webResponse = (WebResponse)httpRequest.GetResponse();
StreamReader webResponseStream = new StreamReader(webResponse.GetResponseStream(), Encoding.UTF8);
return webResponseStream.ReadToEnd();
}
It's saying you're not authorized, so you need to provide credentials.
HttpWebRequest httpRequest = (HttpWebRequest)HttpWebRequest.Create(url);
httpRequest.Method = "POST";
httpRequest.Accept = "application/json";
httpRequest.ContentType = "application/x-www-form-urlencoded";
httpRequest.Credentials = new NetworkCredential("username","password");
httpRequest.UseDefaultCredentials = false; //the default is false, but I included it here just to illustrate that it needs to be false in order to use the specified credentials
There are currently 1205 resources (citations) in the SciTS Mendeley group. However, no matter how we call the “getDocuments” method of the API, we only get the first 1000 resources. Is there a specific parameter we need to pass to get the full list of resources? Or is there a way to make a subsequent call that gets data pages not returned by the first call?
string grantType = "client_credentials";
string applicationID = "id";
string clientsecret = "XXXXXXX";
string redirecturi = "*******";
string url = "https://api-oauth2.mendeley.com/oauth/token";
string view = "all";
string group_id = "f7c0e437-f68b-34df-83c7-2877147ba8f9";
HttpWebResponse response = null;
try
{
// Create the data to send
StringBuilder data = new StringBuilder();
data.Append("client_id=" + Uri.EscapeDataString(applicationID));
data.Append("&client_secret=" + Uri.EscapeDataString(clientsecret));
data.Append("&redirect_uri=" + Uri.EscapeDataString(redirecturi));
data.Append("&grant_type=" + Uri.EscapeDataString(grantType));
data.Append("&response_type=" + Uri.EscapeDataString("code"));
data.Append("&scope=" + Uri.EscapeDataString("all"));
byte[] byteArray = Encoding.UTF8.GetBytes(data.ToString());
// Setup the Request
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = byteArray.Length;
// Write data
Stream postStream = request.GetRequestStream();
postStream.Write(byteArray, 0, byteArray.Length);
postStream.Close();
// Send Request & Get Response
response = (HttpWebResponse)request.GetResponse();
string accessToken;
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
// Get the Response Stream
string json = reader.ReadLine();
Console.WriteLine(json);
// Retrieve and Return the Access Token
JavaScriptSerializer ser = new JavaScriptSerializer();
Dictionary<string, object> x = (Dictionary<string, object>)ser.DeserializeObject(json);
accessToken = x["access_token"].ToString();
}
// Console.WriteLine("Access TOken"+ accessToken);
var apiUrl = "https://api-oauth2.mendeley.com/oapi/documents/groups/3556001/docs/?details=true&items=1250";
try
{
request = (HttpWebRequest)WebRequest.Create(apiUrl);
request.Method = "GET";
request.Headers.Add("Authorization", "Bearer " + accessToken);
request.Host = "api-oauth2.mendeley.com";
response = (HttpWebResponse)request.GetResponse();
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
// Get the Response Stream
string json = reader.ReadLine();
Console.WriteLine(json);
//need this to import documents
}
}
catch (WebException ex1)
{
Console.WriteLine("Access TOken exception" + ex1.Message);
}
}
catch (WebException e)
{
if (e.Response != null)
{
using (HttpWebResponse err = (HttpWebResponse)e.Response)
{
Console.WriteLine("The server returned '{0}' with the status code '{1} ({2:d})'.",
err.StatusDescription, err.StatusCode, err.StatusCode);
}
}
}
The default number of items returned is limited to 1000 per page. For a paginated response you should get some additional fields in the response; notably 'items_per_page','total_pages','total_results'.
I suspect you have will two pages and to get the next result you need to append 'page=1'.
I have to call a Rest API securely. I have an authenticate API which returns a token. I need to add this token the API I am calling.
This is the usual way I know of calling the Rest API. I need to append string token to this request.
// *** Establish the request
string token= getAuthenticate(username,password,out token );
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(lcUrl);
// *** Retrieve request info headers
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
StreamReader loResponseStream = new StreamReader(response.GetResponseStream());
string lcHtml = loResponseStream.ReadToEnd();
response.Close();
loResponseStream.Close();
Not Sure what's the problem... To get the response from the Rest Uri you can do like below :
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(yourUrl + token); // Append Here
request.Method = "GET"; // GET or POST Define Here
//http.Accept = "application/json"; // Add if require
//http.ContentType = "application/json"; // Add if require
String test = String.Empty;
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
Stream dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
test = reader.ReadToEnd();
reader.Close();
dataStream.Close();
}
Or You can use Simple requests through WebClient:
For Example:
WebClient webClient = new WebClient();
string json = string.Empty;
// Downloads JSon String
json = webClient.DownloadString("http://api.openweathermap.org/data/2.5/weather?q=London,uk"); // Replace your URL + Token...
There is third party component also available = RestSharp.
I am using HttpClient, no different at all. I thought this way more clean : http://www.asp.net/web-api/overview/advanced/calling-a-web-api-from-a-net-client
var uri = "http://example.com";
using (HttpClient httpClient = new HttpClient())
{
httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token_you_want_to_used);
var response = await httpClient.GetAsync(uri);
string result = await response.Content.ReadAsStringAsync();
}
I have an ASP.Net Web API and the documentation states I need to save an Auth Token to a cookie then pass it back for API requests. I can get the Auth Token without a problem. My question is what is the best way to save the cookie and send it back in the request.
I create a cookie in the RequestMessage, but I cannot find a way to send it back when making a request against the API. How do I preserve the state of the Login/cookie.
Any help is greatly appreciated, thanks.
Update
I am now able to obtain the cookie from the response. I am using this tutorial. http://www.asp.net/web-api/overview/working-with-http/http-cookies Let me point out if you want to use this tutorial make sure you update the Web API 4's code base. In the below method i am trying to simply, Login and Logout. However, I am receiving an Error Code 500.
public HttpWebResponse InitializeWebRequest()
{
//HttpResponseMessage logoutMessage = await Logout("bla");
string responseData = string.Empty;
string url = GetServerEndPoint();
string authToken = string.Empty;
string loginInstance = "https://example.com";
// Create request.
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(loginInstance);
request.Method = "POST";
request.ContentType = "application/json";
request.CookieContainer = new CookieContainer();
HttpWebResponse response = (HttpWebResponse)request.GetResponseAsync().Result;
if (response.StatusCode == HttpStatusCode.OK)
{
using (System.IO.StreamReader responseReader = new System.IO.StreamReader(request.GetResponse().GetResponseStream()))
{
responseData = responseReader.ReadToEnd();
}
IList<string> authHeader = responseData.Split('{', '}').ToList();
authToken = authHeader[2].Substring(13, 25);
string sessionId = response.Headers.Get(8);
var nv = new NameValueCollection();
nv["sid"] = sessionId;
nv["token"] = authToken;
CookieHeaderValue cookieVal = new CookieHeaderValue("session", nv);
// Log out
string loginInstance2 = "https://example.com";
HttpWebRequest request2 = (HttpWebRequest)WebRequest.Create(loginInstance2);
request2.Method = "POST";
request2.ContentType = "application/json";
request2.Headers.Add(nv);
HttpWebResponse response2 = (HttpWebResponse)request2.GetResponseAsync().Result;
}
return response;
}
WOW WHAT A PAIN!
I have no idea why this took me so long to figure out, but after hours and hours and DAYs, of trying to get this stupid auth to work I finally figured it out. Here is the code.
One weird thing is I had to create the header format for the cookie. Which by definition isn't a true cookie, it is a damn header value. I had to create the header title, because when I extracted the JSON object from the file and converted it to string I was unable to keep the format in tact from the file.
public HttpWebResponse InitiliazeWebRequest()
{
string responseData = string.Empty;
string loginInstance = "url + logincreds";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(loginInstance);
request.Method = "POST";
request.ContentType = "application/json";
request.CookieContainer = new CookieContainer();
HttpWebResponse response = (HttpWebResponse)request.GetResponseAsync().Result;
if (response.StatusCode == HttpStatusCode.OK)
{
using (System.IO.StreamReader responseReader = new System.IO.StreamReader(request.GetResponse().GetResponseStream()))
{
responseData = responseReader.ReadToEnd();
}
var toke = response.Headers.Get("authToken");
JObject o = JObject.Parse(responseData);
_authToken = (string)o["response"]["authToken"].ToString();
return response;
}
return response;
}
public HttpWebResponse LogOut()
{
string responseData = string.Empty;
string loginInstance = "https://www.example.com/logout";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(loginInstance);
request.Method = "GET";
request.ContentType = "application/json";
request.Headers.Add("Cookie: authToken=" + _authToken);
HttpWebResponse response = (HttpWebResponse)request.GetResponseAsync().Result;
if (response.StatusCode == HttpStatusCode.OK)
{
using (System.IO.StreamReader responseReader = new System.IO.StreamReader(request.GetResponse().GetResponseStream()))
{
responseData = responseReader.ReadToEnd();
}
return response;
}
return response;
}
I get an error when trying to retrieve word document by webservice
HttpWebRequest request;
Uri uri = new Uri(serverUrl +
"/bare.aspx/" + Request.PathInfo);
request = (HttpWebRequest)WebRequest.CreateDefault(uri);
request.KeepAlive = false;
request.AllowAutoRedirect = false;
request.ReadWriteTimeout = -1;
request.Timeout = -1;
request.Credentials = System.Net.CredentialCache.DefaultCredentials;
request.Method = "POST";
request.ContentType = "application/octet-stream";
// Serialize argument into request stream
Hashtable arguments = new Hashtable();
arguments["templateFile"] = templateFile;
arguments["hSetDataSource"] = hSetDataSource;
arguments["hSetRepeatBlock"] = hSetRepeatBlock;
arguments["messageForEmptyWord"] = messageForEmptyWord;
arguments["hImageBefore"] = hImageBefore;
arguments["hImageAfter"] = hImageAfter;
arguments["hImageInsideRepeater"] = hImageInsideRepeater;
MemoryStream buf = new MemoryStream();
BinaryFormatter fmt = new BinaryFormatter();
fmt.Serialize(buf, arguments);
request.ContentLength = buf.Length;
Stream reqStream = request.GetRequestStream();
buf.WriteTo(reqStream);
reqStream.Close();
buf.Close();
// Retreive word document from response and return it
// TODO: refactor this to stream directly into the response
HttpWebResponse resp = (HttpWebResponse)request.GetResponse();
When I check the webservice response (HttpWebResponse resp), I get the following error:
System.Net.WebException: The remote server returned an error: (404) Not Found.
I don't understand where is the problem, thank you in advance for your help.
You are not hitting the endpoint. A 404 means the server could not find the URL you are requesting. Verify your .asmx URL by putting it in your web browser. If that works then make sure you code is using that same URL.