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HTTP Post method is not working for yammer api

I need to implement a service for sending invitation mail to users.
I am following Samlman's artice.
I am trying to get a permanent token for Yammer API using the post method shown below.
I'm currently getting:
Error: 404 "server not found error".
There is no inner exception.
Do I need to pass authHeader?
If yes, then how do I send the authHeader?
string authUrl1 = string.Format("https://www.yammer.com/session?client_id={0}" , CLIENT_ID);
string postBody = string.Format(
"{0}{1}{2}{3}{4}{5}{6}",
"utf8=%E2%9C%93&authenticity_token=",
System.Web.HttpUtility.UrlEncode(authToken),
"&network_permalink=&login=",
HttpUtility.UrlEncode(userName),
"&password=",
pwd,
"&remember_me=off");
//make the first post for code
postResults = MakePostRequest(postBody, authUrl1);
private static string MakePostRequest(string postBody, string url, string authHeader = null, string contentType = null)
{
string results = string.Empty;
try
{
//get the session and yamtrack cookie
SetCookies();
wr = WebRequest.CreateHttp(url);
wr.Method = "POST";
wr.CookieContainer = cc;
//if an authHeader was provided, add it as a Bearer token to the request
if (!string.IsNullOrEmpty(authHeader))
wr.Headers.Add("Authorization", "Bearer " + authHeader);
byte[] postByte = Encoding.UTF8.GetBytes(postBody);
if (string.IsNullOrEmpty(contentType))
wr.ContentType = "application/x-www-form-urlencoded";
else
wr.ContentType = contentType;
wr.ContentLength = postByte.Length;
Stream postStream = wr.GetRequestStream();
postStream.Write(postByte, 0, postByte.Length);
postStream.Close();
wResp = (HttpWebResponse)wr.GetResponse();
postStream = wResp.GetResponseStream();
StreamReader postReader = new StreamReader(postStream);
results = postReader.ReadToEnd();
postReader.Close();
postStream.Close();
}
catch (Exception ex)
{
Console.WriteLine("Error in MakePostRequest: " + ex.Message);
}
return results;
}

The information in that blog is incorrect, it does not work and it is unsupported by Yammer. I'd advise you pre-obtain the token using a service account, store it somewhere safe, then pass it as an Authorization header in your POST and/or GET request. A very good example is shown here - http://blogs.technet.com/b/israelo/archive/2015/02/24/consuming-yammer-restful-api-with-angularjs-for-dummies.aspx

The remote server returned an error: (401) Unauthorized when requesting RestApi data

I am triyng to get data from the Rest API. API wants 3 things to give authentication;
first one is "Accept:application/vnd.###.v1.0+json"
second one : "Content Type : application/json"
third one : Base64 encoded "userName:password" string
and I should pass these credentials for validation and authorization in custom header.I know there are a lot of thread on this site about this topic but I couldn't solve the problem from them.
Here is the code block :
public class McAfeeIPSManager
{
String URL = "https://serviceOfApi/sdkapi/session";
public void getWebRequest()
{
System.Net.ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
String username = "user";
String password = "password1";
var request = HttpWebRequest.Create(URL) as HttpWebRequest;
request.Accept = "application/vnd.###.v2.0+json";
request.Method = "GET";
request.ContentType = "application/json";
String encoded = System.Convert.ToBase64String(System.Text.Encoding.GetEncoding("ISO-8859-1").GetBytes(username + ":" + password));
request.Headers.Add("Authorization","Basic "+encoded);
try
{
// Get response
using (var response = request.GetResponse() as HttpWebResponse)
{
// Get the response stream
using (var responseReader = new StreamReader(response.GetResponseStream()))
{
string responseBody = responseReader.ReadToEnd();
// Console application output
System.Diagnostics.Debug.Write("Response Body ---> " + responseBody);
//Console.WriteLine(responseBody);
}
}
}
catch (WebException ex)
{
System.Diagnostics.Debug.Write("Error : " + ex.Message);
Console.WriteLine("Error: {0}", ex.Message);
}
}
}
How can get data from WebAPI under these conditions?Can anybody help me?

You have no PreAuthenticate and credential ?
I have a code that may help you:
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://pwmaffr2:8443/remote/system.delete?names=" + DeviceName + "");
request.Headers.Add("AUTHORIZATION", "Basic YTph");
request.ContentType = "text/html";
request.Credentials = new NetworkCredential(Username, Password);
ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
request.PreAuthenticate = true;
request.Method = "GET";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
);
StreamReader stream = new StreamReader(response.GetResponseStream());
string X = stream.ReadToEnd();

hmm in addition of what i post try deal with this it should work for you hope:
string credentials = String.Format("{0}:{1}", username, password);
byte[] bytes = Encoding.ASCII.GetBytes(credentials);
string base64 = Convert.ToBase64String(bytes);
string authorization = String.Concat("basic ", base64);
request.Headers.Add("Authorization", authorization);

Get access token from google oauth from code

i used following code to get the access token from code as below
String code = HttpContext.Current.Request["code"];
string redirecturl = HttpContext.Current.Request["url"];
string Url = "https://accounts.google.com/o/oauth2/token";
string grant_type = "authorization_code";
string redirect_uri_encode = UrlEncodeForGoogle(url);
string data = "code={0}&client_id={1}&client_secret={2}&redirect_uri={3}&grant_type={4}&access_type={5}";
HttpWebRequest request = HttpWebRequest.Create(Url) as HttpWebRequest;
string result = null;
request.Method = "POST";
request.KeepAlive = true;
request.ContentType = "application/x-www-form-urlencoded";
string param = string.Format(data, code,configurationInfo.oauthclientid , configurationInfo.oauthclientsecretid, redirect_uri_encode, grant_type, "offline");
var bs = Encoding.UTF8.GetBytes(param);
using (Stream reqStream = request.GetRequestStream())
{
reqStream.Write(bs, 0, bs.Length);
}
using (WebResponse response = request.GetResponse())
{
var sr = new StreamReader(response.GetResponseStream());
result = sr.ReadToEnd();
sr.Close();
}
i am getting response as
The remote server returned an error: (400) Bad Request.
i do not know where i went wrong
waiting for your valuable comments

Google also provides a higher level library for accessing its services. I find it makes it much easier to work with its APIs.
http://code.google.com/p/google-api-dotnet-client/

Can't Login to cPanel with C# WebRequest

I am struggling to develop a C# class to login to cPanel on a web host (Hostgator).
In PHP it is quite easy using the Curl extension as follows:
$url = "http://mysite.com:2082/";
$c = curl_init($url);
curl_setopt($c, CURLOPT_USERPWD, 'user:password');
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($c);
if ($result === false)
$result = curl_error($c);
curl_close($c);
file_put_contents('log.txt', $result);
//print_r($result);
Now here is my C# class with the various attempts to make it work commented out:
class HTTPHandler
{
public static string Connect (string url, string userName, string password)
{
string result;
try
{
// An initial # symbol in the password must be escaped
if (password.Length > 0)
if (password[0] == '#')
password = "\\" + password;
// Create a request for the URL.
WebRequest request = WebRequest.Create(url);
request.PreAuthenticate = true;
request.Credentials = new NetworkCredential(userName, password);
/*
var credCache = new CredentialCache();
credCache.Add(new Uri(url), "Basic",
new NetworkCredential(userName, password));
request.Credentials = credCache;
*/
//request.Method = "POST";
//request.ContentType = "application/x-www-form-urlencoded";
/*
// Create POST data and convert it to a byte array.
string postData = string.Format("user={0}&pass={1}", userName, password);
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.ContentLength = byteArray.Length;
request.ContentType = "application/x-www-form-urlencoded";
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
*/
// Get the response.
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
// Get the stream containing content returned by the server.
Stream dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Display the content.
result = string.Format("Server response:\n{0}\n{1}", response.StatusDescription, reader.ReadToEnd());
// Cleanup the streams and the response.
reader.Close();
dataStream.Close();
response.Close();
}
catch (Exception e)
{
result = string.Format("There was an error:\n{0}", e.Message);
}
return result;
}
}
}
But I keep getting an error 401 (Unauthorized) at the GetResponse stage.
When I compare the $_SERVER vars in my local host test page between the PHP and C# submissions, I get the same data apart from the sender port being a bit different. The crucial PHP_AUTH_USER and PHP_AUTH_PW are the same.
My OS is Windows 7 64 bit and I am using Visual C# 2010.
I guess the solution is really simple, but so far I am baffled. But a relative newbie to C#. I hope somebody can help.

You don't really need to set PreAuthenticate, just let the request figure it out. Also I would suggest using HttpWebRequest instead of WebRequest. The main difference is that you can set CookieContainer property to enable cookies. This is a bit confusing since by default it will have cookies disabled and all you need to do is to set it to new CookieContainer(); to enable cookies for your request.
This matters because of the redirects that happen during authentication and the auth cookie that records the fact that you successfully authenticated.
Also a coding style note: please make sure to wrap all the IDisposables (such as response, stream and reader) in the using() statement.
Also I am unclear why are you escaping # in the password. Request should take care of all your encoding needs automagically.
Complete sample code:
var request = WebRequest.CreateHttp(url);
request.Credentials = new NetworkCredential(username, password);
request.CookieContainer = new CookieContainer(); // needed to enable cookies
using (var response = (HttpWebResponse)request.GetResponse())
using (var reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(response.CharacterSet)))
return string.Format("Server response:\n{0}\n{1}", response.StatusDescription, reader.ReadToEnd());
edit: Sorry for all the edits. I was writing code by memory and was struggling a bit with getting the encoding part right.

This is using System.Web where I had to set the project properties to use the full .NET Framework 4 to gain access to this assembly for the HttpUtility and add a reference to System.Web in References.
I didn't test all the overloaded methods but the main thing is the cPanel connection where the authentication credentials are added to the http header when a userName is present.
Also, for cPanel I needed to set request.AllowAutoRedirect = false; so that I control page by page access since I didn't manage to capture cookies.
Here is the code for the HTTP Helper Class that I came up with:
class HTTPHandler
{
// Some default settings
const string UserAgent = "Bot"; // Change this to something more meaningful
const int TimeOut = 1000; // Time out in ms
// Basic connection
public static string Connect(string url)
{
return Connect(url, "", "", UserAgent, "", TimeOut);
}
// Connect with post data passed as a key : value pair dictionary
public static string Connect(string url, Dictionary<string, string> args)
{
return Connect(url, "", "", UserAgent, ToQueryString(args), TimeOut);
}
// Connect with a custom user agent specified
public static string Connect(string url, string userAgent)
{
return Connect(url, "", "", userAgent, "", TimeOut);
}
public static string Connect(string url, string userName, string password, string userAgent, string postData, int timeOut)
{
string result;
try
{
// Create a request for the URL.
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
if (userAgent == null)
userAgent = UserAgent;
request.UserAgent = userAgent;
request.Timeout = timeOut;
if (userName.Length > 0)
{
string authInfo = userName + ":" + password;
authInfo = Convert.ToBase64String(Encoding.Default.GetBytes(authInfo));
request.Headers["Authorization"] = "Basic " + authInfo;
request.AllowAutoRedirect = false;
}
if (postData.Length > 0)
{
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
// Create POST data and convert it to a byte array.
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.ContentLength = byteArray.Length;
using (Stream dataStream = request.GetRequestStream())
{
dataStream.Write(byteArray, 0, byteArray.Length);
}
}
// Get the response.
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
// Get the stream containing content returned by the server.
Stream dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
using (StreamReader reader = new StreamReader(dataStream))
{
result = string.Format("Server response:\n{0}\n{1}", response.StatusDescription, reader.ReadToEnd());
}
}
}
catch (Exception e)
{
result = string.Format("There was an error:\n{0}", e.Message);
}
return result;
}
public static string ToQueryString(Dictionary<string, string> args)
{
List<string> encodedData = new List<string>();
foreach (KeyValuePair<string, string> pair in args)
{
encodedData.Add(HttpUtility.UrlEncode(pair.Key) + "=" + HttpUtility.UrlEncode(pair.Value));
}
return String.Join("&", encodedData.ToArray());
}
}

Windows Live SDK Authorization

I'm working with Windows Live SDK from C# trying to invoke directly the rest service for getting my oAuth token, but instead I'm getting an 401 Error. Unauthorized.
I have my application registered as Desktop Application on https://manage.dev.live.com/ and published so I have my own Client ID and Secret Key.
From my desktop application I open an Internet Explorer Window for Live Login and get my Verification Code.
With that code, secret key and clientID I invoke AccessToken.aspx on this way:
try
{
string requestUrl = "https://consent.live.com/AccessToken.aspx";
// Request the access token.
string postData = string.Format("wrap_client_id={0}&wrap_client_secret={1}&wrap_verification_code={2}",
clientId,
secretKey,
verificationCode);
postData = HttpUtility.UrlEncode(postData);
byte[] postDataEncoded = System.Text.Encoding.UTF8.GetBytes(postData);
WebRequest req = HttpWebRequest.Create(requestUrl);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = postDataEncoded.Length;
Stream requestStream = req.GetRequestStream();
requestStream.Write(postDataEncoded, 0, postDataEncoded.Length);
WebResponse res = req.GetResponse();
string responseBody = null;
using (StreamReader sr = new StreamReader(res.GetResponseStream(), Encoding.UTF8))
{
responseBody = sr.ReadToEnd();
}
// Process FORM POST.
NameValueCollection responseCollection = System.Web.HttpUtility.ParseQueryString(responseBody);
return responseCollection["wrap_access_token"];
}
catch (Exception ex)
{
throw ex;
}
What I'm doing wrong?
Thanks in advance for any help provided.

The remote server returned an error: (401) Unauthorized