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HTTPWebResponse "GET" API Call Exception - C#

I'm attempting to access a remote API and I'm getting a few exceptions during the HTTPWebResponse call. Below is my code:
//url
string responseValue = string.Empty;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("www.someapi.com")
request.Method = "GET";
request.UseDefaultCredentials = true;
request.ContentType = "application/json; charset=utf-8";
request.Headers("x-ms-client-id", "data");
try{
using (var response = (HttpWebRequest)req.GetResponse()){ <--- this line is the one that fails. System.IO.IOException here.
using (var stream = response.GetResponseStream()){
using(var sr = new StreamReader(stream)){
responseValue = sr.ReadToEnd();
}
}
}
} catch ///catch
The errors I'm getting are SocketExceptions and WebExceptions. I'm not sure why this specific call is failing. When I attempt the same URL and headers in Postman, the call returns a 200.
Any ideas would be appreciated.
EDIT:
Adding the error messages I'm getting. The exception being thrown when the response is attempted is
System.IO.IOException: "Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host."

Usually, I often use HttpWebRequest like below code.
You can download the HttpHelper I compiled and call it according to my reference example, or you can add Http Header as required.
How to invoke HttpHelper, ex: Get Method
Console app to use azure storage tableapi
String PostParam = String.Empty;
if (Data != null)
{
PostParam = Data.ToString();//Newtonsoft.Json.JsonConvert.SerializeObject(Data);
}
byte[] postData = Encoding.UTF8.GetBytes(PostParam);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri(url + (Id == null ? "" : '/' + Id.ToString())));
request.Method = Method;
request.ServicePoint.Expect100Continue = false;
request.Timeout = HttpRequestTimeOut;
request.ContentType = "application/json";
request.ContentLength = postData.Length;
if (postData.Length > 0)
{
using (Stream requestStream = request.GetRequestStream())
{
requestStream.Write(postData, 0, postData.Length);
}
}
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
Response.Code = response.StatusCode;
using (StreamReader stream = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
{
Response.Data = stream.ReadToEnd();
}
}

WEBException was unhandled: The remote server returned an error: (500) Internal Server Error

I am implementing REST service and I am getting the above error. I searched a lot and used different methods to resolve this error but no luck. The service is working fine when I am using Postman or fiddler.
Here is my code :
try
{
string content = string.Empty;
var httpWebRequest = (HttpWebRequest)WebRequest.Create(new Uri("https://api.MYDOMAIN.com/servlet/Year"));
httpWebRequest.Method = "POST";
string parsedContent = "{\"securitykey\":\"KEY\"}";
var data = JObject.Parse(parsedContent);
Byte[] bytes = Encoding.UTF8.GetBytes(data.ToString());
httpWebRequest.ContentLength = bytes.Length;
httpWebRequest.ContentType = "application/json";
Stream newStream = httpWebRequest.GetRequestStream();
newStream.Write(bytes, 0, bytes.Length);
newStream.Close();
var response = (HttpWebResponse)httpWebRequest.GetResponse();
var stream = response.GetResponseStream();
if (stream != null)
{
var sr = new StreamReader(stream);
content = sr.ReadToEnd();
}
}
catch (WebException ex)
{
throw;
}
So in the above code I tried with :
httpWebRequest.ContentType = "application/x-www-form-urlencoded";
HttpUtility.UrlEncode()
I also tried the below code but it is giving me the same error :
using (var client = new WebClient())
{
client.Headers[HttpRequestHeader.ContentType] = "application/json";
result = client.UploadString("https://api.MYDOMAIN.com/servlet/Year", "POST", "{\"securitykey\":\"MYKEY\"}");
}
I added the security key in raw header as httpWebRequest.Headers.Add("{\"securitykey\":\"MYKEY\"}") but still no luck.
Really appreciate if I can get some help.

After a lot of RND I tried doing this in PHP, so it gave me an error as UserAgent is required. I added httpWebRequest.UserAgent and it worked. This error was never displayed in WebException.

client to server, server returns error but client thinks success

MVC Application - uploading file from client to server through a stream:
string responseContents = string.Empty;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
byte[] requestBytes = System.Text.Encoding.ASCII.GetBytes(message);
request.Method = "POST";
request.ContentType = "text/xml;charset=utf-8";
request.ContentLength = requestBytes.Length;
using (Stream requestStream = request.GetRequestStream())
{
requestStream.Write(requestBytes, 0, requestBytes.Length);
requestStream.Close();
}
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
using (StreamReader sr = new StreamReader(response.GetResponseStream(), System.Text.Encoding.Default))
{
responseContents = sr.ReadToEnd();
}
}
the problem is if there is an error on the server side, client account cant be found for example (the client account to save the upload to.) the responseContents returns an error:
<?xml version="1.0" encoding="utf-8"?><Result><Value>FAIL</Value><Message>Client Account can't be NULL</Message></Result>
then continues on with the code
Console.WriteLine("Server returns:");
Console.WriteLine(responseContents);
and the client thinks this is a success.
Is there any sort of way to check the responseContents returned xml for the word 'FAIL' so I can throw an error on the client side?
Regards
J

Json POST request to the server but server respond (400) Bad Request

I want to use google api for creation of gmail user account. I am sending JSON request to server for getting authorization code but I got these error in httpwebresponse :-
Exception Details: System.Net.WebException: The remote server returned an error: (400) Bad Request
var request = (HttpWebRequest)WebRequest.Create(#"https://accounts.google.com/o/oauth2/auth");
request.Method = "POST";
request.ContentType = "text/json";
request.KeepAlive = false;
//request.ContentLength = 0;
using (StreamWriter streamWriter = new StreamWriter(request.GetRequestStream()))
{
string json = "{\"scope\":\"https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.email+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.profile\"," + "\"state\":\"%2Fprofile\"," + "\"redirect_uri\":\"http://gmailcheck.com/response.aspx\"," + "\"response_type\":\"code\"," + "\"client_id\":\"841994137170.apps.googleusercontent.com\"}";
streamWriter.Write(json);
// streamWriter.Flush();
//streamWriter.Close();
}
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
StreamReader responsereader = new StreamReader(response.GetResponseStream());
var responsedata = responsereader.ReadToEnd();
//Session["responseinfo"] = responsereader;
//testdiv.InnerHtml = responsedata;
}
}

As soon as you get an exception, you have to read the actual responce from server there should be something helpfull. Like an error description or extended status code...
For Instance:
try
{
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
... your code goes here....
}
catch (WebException ex)
{
using (WebResponse response = ex.Response)
{
var httpResponse = (HttpWebResponse)response;
using (Stream data = response.GetResponseStream())
{
StreamReader sr = new StreamReader(data);
throw new Exception(sr.ReadToEnd());
}
}
}

reading xml from URL

I am trying to read xml from the url(well its not url its restful service) and below is my code. I dont know what the problem is but Iam unable to read the xml from url. I am getting error and I am not getting any data..
string soap = "";
if (fPortalGuid != string.Empty)
{
HttpWebRequest request = WebRequest.Create("http://cramapp-dt-02s.cable.comcast.com:8158/restfulqueryservice/queryservice/getrequestdetails?api_key=......&request_id=33ebc6e9-9def-4f39-adf9-bba2edef3b54") as HttpWebRequest;
//request.Credentials = new NetworkCredential("rolland", "409cleaner");
//request.ContentType = "application / json; charset = utf - 8";
request.Method = "POST";
using (Stream stm = request.GetRequestStream())
{
using (StreamWriter stmw = new StreamWriter(stm))
{
stmw.Write(soap);
}
}
// Get response
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
// Get the response stream
StreamReader reader = new StreamReader(response.GetResponseStream());
// Console application output
Console.WriteLine(reader.ReadToEnd());
}
}
and the xml looks like this

This line may makes error
HttpWebRequest request = WebRequest.Create("http://cramapp-dt-02s.cable.comcast.com:8158/restfulqueryservice/queryservice/getrequestdetails?api_key=......&request_id=33ebc6e9-9def-4f39-adf9-bba2edef3b54") as HttpWebRequest;
Because the url in the create function is not avaiable too access (too long so has ... for shout display), try locate and paste the full link or this link :
http://www.w3schools.com/xml/note.xml