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GDax API GET request always returns Error 400

I'm trying to get the order book from GDAX (link to documentation of the call) but when doing it from the c# executable I always get Error 400 - Bad request.
When taking the actual URL and pasting it into my browser, it works fine.
String URL = "https://api.gdax.com/products/BTC-USD/book?level=2";
WebRequest request = WebRequest.Create(URL);
WebResponse response = request.GetResponse();

The actual issue with your API call is , the API is expecting a user-agent string while making the request: Below is the code in working condition:
try
{
String URL = "http://api.gdax.com/products/BTC-USD/book?level=2";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
request.UserAgent = ".NET Framework Test Client";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
var encoding = ASCIIEncoding.ASCII;
using (var reader = new System.IO.StreamReader(response.GetResponseStream(), encoding))
{
string responseText = reader.ReadToEnd();
}
}
catch(WebException ex)
{
HttpWebResponse xyz = ex.Response as HttpWebResponse;
var encoding = ASCIIEncoding.ASCII;
using (var reader = new System.IO.StreamReader(xyz.GetResponseStream(), encoding))
{
string responseText = reader.ReadToEnd();
}
}
Basically ProtocolError indicates that you have received the response but there is an error related to protocol, which you can observe, when you read the response content from exception. I have added catch to handle the exception and read ex.Response (which is HttpWebResponse) and could see that the API is asking for user-agent to be suppllied while making the call. I got to see the error as "{"message":"User-Agent header is required."}"
You can ignore the code inside the exception block, I used it only to see what is the actual response message, which contains actual error details
Note: I have boxed WebRequest to HttpWebRequest to have additional http protocol related properties and most importantly "UserAgent" property which is not available with the WebRequest class.

You need to Accept the certificarte, Google for access to a https webrequest.
Like this

c# System.Net.WebException: 'Error on the remote server: (400) Bad Request.' - HttpWebResponse

var url = ConfigurationManager.AppSettings["URL"] + "/Archivador/MoverEnvio";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
if (Certificado != null)
{
// Y añadirlo a la petición HTTP
req.ClientCertificates.Add(Certificado);
}
req.Method = "PUT";
req.ContentType = "application/json";
ArchivadorModelPut Mover = new ArchivadorModelPut()
{
ID_ARCHIVADOR = idArchivador,
ID_ENVIO = idEnvio
};
using (var streamWriter = new StreamWriter(req.GetRequestStream()))
{
string json = JsonConvert.SerializeObject(Mover);
streamWriter.Write(json);
streamWriter.Flush();
streamWriter.Close();
}
using (HttpWebResponse resp = (HttpWebResponse)req.GetResponse())
{
StreamReader reader = new StreamReader(resp.GetResponseStream());
var dato = reader.ReadToEnd();
string returnString = resp.StatusCode.ToString();
}
I got this Exception:
System.Net.WebException: 'Error on the remote server: (400) Bad
Request.'
On line:
using (HttpWebResponse resp = (HttpWebResponse)req.GetResponse())
I don't know how to resolve the problem, can someone help me?
If you need more information about it, let me know.

This exception means that the request was completed successfully, however a 400 HTTP response was returned. A 400 HTTP response normally means that your client did not send the correct data, however its completely up to the destination server under what circumstances a 400 response would be returned.
If you catch the WebException you can use the Response property to look at the HTTP response - depending on the server it might contain a description of the error.
If its normal practice for the destination service to return a 400 response then take a look at Why does HttpWebRequest throw an exception instead returning HttpStatusCode.NotFound? for an extension method that can be used to get the response regardless of the status code. Alternatively you could use an alternative class that doesn't throw, e.g. HttpClient.

OneLogin Create Session Login Token API returns status 400 with message: Bad Request

I am developing a C# application which needs to use the onelogin API to retrieve a session token. I am able to authenticate and and create a token with the following code:
WebRequest Authrequest = WebRequest.Create("https://api.us.onelogin.com/auth/oauth2/token");
Authrequest.Method = "POST";
Authrequest.ContentType = "application/json";
Authrequest.Headers.Add("cache-control", "no-cache");
Authrequest.Headers.Add("Authorization: client_id:XXXXXXX7bbf2c50200d8175206f664dc28ffd3ec66eef0bfedb68c3366420dc, client_secret:XXXXXXXXXX6ba2802187feb23f6450c6812b8e6639361d24aa83f12010f ");
using (var streamWriter = new StreamWriter(Authrequest.GetRequestStream()))
{
string Authjson = new JavaScriptSerializer().Serialize(new
{
grant_type = "client_credentials"
});
streamWriter.Write(Authjson);
}
WebResponse AuthReponse;
AuthReponse = Authrequest.GetResponse();
Stream receiveStream = AuthReponse.GetResponseStream ();
// Pipes the stream to a higher level stream reader with the required encoding format.
StreamReader readStream = new StreamReader (receiveStream);
JObject incdata = JObject.Parse(readStream.ReadToEnd());
string sToken = incdata["data"][0]["access_token"].Value<string>();
AuthReponse.Close();
However, when running the Create Session Login Token with the following code, it only returns a 400 error, and the message has no detail. Just Bad Request:
//Get the session token for the specified user, using the token recieved from previous web request
WebRequest request = WebRequest.Create("https://api.us.onelogin.com/api/1/login/auth");
request.Method = "POST";
request.ContentType = "application/json";
request.Headers.Add("authorization", "bearer:" + sToken);
using (var streamWriter2 = new StreamWriter(request.GetRequestStream()))
{
string json = JsonConvert.SerializeObject(new
{
username_or_email = sUsername,
password = sPassword,
subdomain = "comp-alt-dev"
});
streamWriter2.Write(json);
}
WebResponse response;
response = request.GetResponse();
string streamText = "";
var responseStream = response.GetResponseStream();
using (responseStream)
{
var streamReader = new StreamReader(responseStream);
using (streamReader)
{
streamText = streamReader.ReadToEnd();
streamReader.Close();
//
}
responseStream.Close();
}
Any ideas?
-Thank you

Also for anyone who may be getting this error. in C# the email is case sensitive. I tried User.email.com. In onelogin it was saved as user#email.com. changing the c# to lower case fixed it.

Can you let us know what payload you're sending across the wire to the .../1/login/auth endpoint as well as the response (either as others have suggested as packet snoop, or just as a debug output from the code)
400 means either bad json or the endpoint requires MFA, so this will narrow it down.
~thanks!

Just joining the troubleshooting effort =) -- I can replicate a 400 Bad Request status code with a "bad request" message when the request body contains a username_or_email and/or subdomain value that does not exist, or if the request body is empty.

Can you post what goes over the wire to the OneLogin endpoint...
OK Thanks. So it appears your subdomain does not exist. If you give me an email in the account I can find the correct subdomain value for you.

Calling Eventbrite API from .Net results in 401

I am trying to retrieve an order from the Eventbrite API. I have a valid OAuth token and order number. I have verified this by using postman which successfully returns the correct JSON.
However when I make the call using the following c# code, I get a 401 Unauthorised:
var client = new HttpClient();
var req = new HttpRequestMessage(HttpMethod.Get, "https://www.eventbriteapi.com/v3/orders/{orderNo}");
req.Headers.Add("Authorization", "Bearer {authToken}");
var response = await client.SendAsync(req);
I've tried replacing the header with:
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("{authToken}");
I have also tried:
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://www.eventbriteapi.com/v3/orders/{orderNo}");
request.Headers.Add("Authorization", "Bearer {authToken}");
request.Accept = "application/json";
using(WebResponse response = request.GetResponse())
{
using(Stream dataStream = response.GetResponseStream())
{
using(StreamReader reader = new StreamReader(dataStream))
{
string responseFromServer = reader.ReadToEnd();
}
}
}
All of these get a 401 response.
I know the authtoken and the eventid are correct, so there must be something wrong with my code.
Am I doing something wrong with the authroisation token?

Have you tried ?token={authToken} option on the EventBrite API?
This would at least confirm if it's a problem with the way the header is being sent across.
http://developer.eventbrite.com/docs/auth/

You omitted the trailing '/' in the URL, which caused a subsequent redirect from "eventbriteapi.com/v3/orders/{orderNo}" to "eventbriteapi.com/v3/orders/{orderNo}/". The authorization header was dropped in the redirect.

Why is the google server returning error 401 when trying to get token?

i'm currently trying to develop an api for google reader and when i'm trying to get the token, the following error is being generated:
System.Net.WebException: The remote server returned an error: (401) Unauthorized.
at System.Net.HttpWebRequest.GetResponse()
first i'm getting the session... and this works perfectly. then the following method i being called to get the token:
public String setToken()
{
HttpWebResponse response;
HttpWebRequest request;
cookie = new Cookie("SID", this.sessionID, "/", ".google.com");
String url = "http://www.google.com/reader/api/0/token";
request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "GET";
request.CookieContainer = new CookieContainer();
request.CookieContainer.Add(this.cookie);
response= (HttpWebResponse)request.GetResponse();
using (var stream = response.GetResponseStream())
{
StreamReader r = new StreamReader(stream);
this.token = r.ReadToEnd();
}
return this.token;
}
the exception is being generated in this line:
response= (HttpWebResponse)request.GetResponse();
does anyone know what might be causing this error please?
PS. I read the question : Why am I getting a 401 (Unauthorized) error when POSTing to Google Reader API? however he was getting this error when he tried to post.

Google has changed, according to Eric Mann:
"As it turns out, Google has changed the authentication portion of the Reader API. Now, instead of passing the SID in a cookie when you make a request, you set an authentication header with the “Auth” key originally passed with the SID."
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