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Getting 400 exception in HttpWebRequest Call

I am using Postman to get the response from rest end point, and if I pass wrong data I am getting 400 exception which is very correct as per the logic.
But if I try to call the same web request from C# code(with same wrong parameter), I am getting exception but not the same as I am getting in Postman tool.
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://apiurl");
httpWebRequest.ContentType = "application/json";
httpWebRequest.Headers.Add("Authorization", "Bearer " + token);
httpWebRequest.Method = "POST";
httpWebRequest.UserAgent = ".Net application";
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
string json = JsonConvert.SerializeObject(obj);//obj is parameter
streamWriter.Write(json);
}
try
{
HttpWebResponse httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
}
}
catch (WebException e)
{
}
Can I know why I am getting errors differently from postman and C# code
Regards
Anand

Added below code in the exception block and it gave me the same response as Postman
catch(WebException ex)
{
string message = ex.Message;
WebResponse errorResponse = ex.Response;
if (errorResponse != null)
{
using (Stream responseStream = errorResponse.GetResponseStream())
{
StreamReader reader = new StreamReader(responseStream, Encoding.GetEncoding("utf-8"));
message = reader.ReadToEnd();
}
}
}

HttpWebRequest from a local WCF service

I am doing some testing for a Xamarin Android app with a simple local WCF service to prove my connection code works.
Service:
[OperationContract]
string Ping();
…
public string Ping()
{
return "Pong";
}
Test Code in Xamarin App:
var request = HttpWebRequest.Create(string.Format(#"http://192.168.1.175/_Services/TestService1.svc/Ping"));
request.Credentials = CredentialCache.DefaultCredentials;
request.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";
request.ContentLength = 0; //pass.Length;
request.Method = "POST";
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) //Errors out here
{
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
var content = reader.ReadToEnd();
Console.Out.WriteLine("Response Body: \r\n {0}", content);
}
}
Error:
The remote server returned an error: (400) Bad Request.
Edit:
When using ServiceReference, the following works:
private void button3_Click(object sender, EventArgs e)
{
ServiceReference1.TestService1Client client = new ServiceReference1.TestService1Client();
string returnString;
returnString = client.Ping();
label1.Text = returnString;
}
Slightly different code still does not work:
private void button4_Click(object sender, EventArgs e)
{
//string serviceUrl = "http://192.168.1.175/_Services/TestService1.svc";
string serviceUrl = "http://localhost/_Services/TestService1.svc";
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(new Uri(serviceUrl + "/Ping"));
httpRequest.Accept = "text/xml";
httpRequest.ContentType = "text/xml";
httpRequest.Method = "POST";
httpRequest.ContentLength = 0;
httpRequest.KeepAlive = false;
using (HttpWebResponse httpResponse = (HttpWebResponse)httpRequest.GetResponse()) //400 Bad Request
{
using (Stream stream = httpResponse.GetResponseStream())
{
label1.Text = (new StreamReader(stream)).ReadToEnd();
}
}
}

The answer was rooted in System.ServiceModel.Activation.WebServiceHostFactory
For some reason none of my sources mentioned this during research for using HttpWebRequest.
I found the reference by chance when looking at Android WCF consuming.
https://minafayek.wordpress.com/2013/04/02/consuming-iis-published-restful-wcf-service-from-android-over-wifi/
I got my testing programs working so, I should be able to move forward.

Login into iCloud via Json Post request

I'm trying to log in into iCloud using a Json Post request in C#. Before trying to implement the code I was studying a little bit the iCloud requests using Chrome Console and using an Ad-on to replicate the requests in order to obtain the same result of the website.
First of All I checked the request directly from iCloud website:
And this is the response:
{
"serviceErrors" : [ {
"code" : "-20101",
"message" : "Il tuo ID Apple o la password non sono corretti."
} ]
}
Using "Advance REST Client" ad Chrome plugin to replicate the request I ve tried the same Json request to the same Url. But I get Empty response:
I Also tried to copy and paste the whole Header (All the settings) and than send the request but the response is the same:
Anyone has an Advice?
UPDATE: I tried to implement A Json request through c# program:
var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://idmsa.apple.com/appleauth/auth/signin");
httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = "POST";
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
string json = "{accountName: \"briesanji #gmail.com\", password: \"testPassword\", rememberMe: false, trustTokens: []}";
streamWriter.Write(json);
streamWriter.Flush();
streamWriter.Close();
}
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
}
The problem is that Execution breaks when the
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
is hit and it gives me this error: System.Net.WebException: 'Error Remote Server: (400) Request not valid.'
UPDATE: I solved in this way:
void POST(string url, string jsonContent)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "POST";
System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
Byte[] byteArray = encoding.GetBytes(jsonContent);
request.ContentLength = byteArray.Length;
request.ContentType = #"application/json";
using (Stream dataStream = request.GetRequestStream())
{
dataStream.Write(byteArray, 0, byteArray.Length);
}
long length = 0;
try
{
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
length = response.ContentLength;
}
}
catch (WebException ex)
{
// Log exception and throw as for GET example above
}
}
string GET(string url)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
try
{
WebResponse response = request.GetResponse();
using (Stream responseStream = response.GetResponseStream())
{
StreamReader reader = new StreamReader(responseStream, Encoding.UTF8);
return reader.ReadToEnd();
}
}
catch (WebException ex)
{
WebResponse errorResponse = ex.Response;
using (Stream responseStream = errorResponse.GetResponseStream())
{
StreamReader reader = new StreamReader(responseStream, Encoding.GetEncoding("utf-8"));
String errorText = reader.ReadToEnd();
// log errorText
}
throw;
}
}
Anyways I tested also the Answer and it was good to.. So I check it as valid thanks.

With this i dont get any error and the response content of the second request just tells me that there were too many failed logins for the test account...
private static void ICloud()
{
var cc = new CookieContainer();
var first = (HttpWebRequest)WebRequest.Create("https://idmsa.apple.com/appleauth/auth/signin?widgetKey=83545bf919730e51dbfba24e7e8a78d2&locale=de_DE&font=sf");
first.Method = "GET";
first.CookieContainer = cc;
var response1 = (HttpWebResponse)first.GetResponse();
using (var streamReader = new StreamReader(response1.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
}
var second = (HttpWebRequest)WebRequest.Create("https://idmsa.apple.com/appleauth/auth/signin");
second.ContentType = "application/json";
second.Method = "POST";
second.Accept = "application/json";
second.CachePolicy = new RequestCachePolicy(RequestCacheLevel.NoCacheNoStore);
second.Referrer = "https://idmsa.apple.com/appleauth/auth/signin?widgetKey=83545bf919730e51dbfba24e7e8a78d2&locale=de_DE&font=sf";
second.Headers.Add("X-Requested-With", "XMLHttpRequest");
second.Headers.Add("X-Apple-Widget-Key", "83545bf919730e51dbfba24e7e8a78d2");
using (var streamWriter = new StreamWriter(second.GetRequestStream()))
{
string json = "{\"accountName\":\"test#icloud.com\",\"password\":\"test\",\"rememberMe\":false,\"trustTokens\":[]}";
streamWriter.Write(json);
streamWriter.Flush();
streamWriter.Close();
}
try
{
var response2 = (HttpWebResponse)second.GetResponse();
using (var streamReader = new StreamReader(response2.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
}
}
catch(WebException we)
{
using (var r = new StreamReader(we.Response.GetResponseStream()))
{
var result2 = r.ReadToEnd();
}
}
}

Exception while trying to post data from PCL project

I am trying to post data from PCL project to remote server. Below is my code:
public async Task<bool> SendToken(string deviceToken, string userId)
{
HttpWebRequest request;
string url = "http://192.168.1.171:91/api/updatePushDeviceToken";
request = (HttpWebRequest)WebRequest.Create(url);
request.ContentType = "application/x-www-form-urlencoded";
request.Accept = "application/json";
request.Method = "POST";
string postData = string.Format("userId={0};token={1}&deviceType={2}", userId, deviceToken, deviceType);
var data = Encoding.UTF8.GetBytes(postData);
try
{
request.BeginGetResponse(new AsyncCallback(FinishRequest), request);
}
catch (Exception e)
{
string m = e.Message;
}
return false;
}
private void FinishRequest(IAsyncResult result)
{
HttpWebResponse response = (result.AsyncState as HttpWebRequest).EndGetResponse(result) as HttpWebResponse;
Stream receiveStream = response.GetResponseStream();
StreamReader readStream = new StreamReader(receiveStream);
var responseString = readStream.ReadToEnd();
}
While running above code, below exception was thrown:
System.Net.WebException: The remote server returned an error: (411)
Length Required.
PCL doesn't contain ContentLength property, hence I added Length as below but now I am getting exception as:
try
{
request.Headers[HttpRequestHeader.ContentLength] = "0";
}
catch (Exception e)
{
}
System.ArgumentException: This header must be modified with the
appropiate property. at
System.Net.WebHeaderCollection.CheckRestrictedHeader (System.String
headerName)

Your request is missing of ContentLength property of your post parameters.
var parameters = Encoding.ASCII.GetBytes(qstring);
var request = (HttpWebRequest)HttpWebRequest.Create(url);
request.AllowAutoRedirect = false;
request.ContentType="application/x-www-form-urlencoded";
request.Method = "POST";
request.ContentLength = parameters.Length;
//Send it
var reqStream = request.GetRequestStream();
reqStream.Write(parameters, 0, parameters.Length);
reqStream.Close();
//read it
var response = (HttpWebResponse)request.GetResponse();
var sr = new StreamReader(response.GetResponseStream());
string responseHtml = sr.ReadToEnd().Trim();
And please use querystring format to post data, for example : "userId={0}&token={1}&..."

"An existing connection was forcibly closed by the remote host c#"

I am getting the exception error for this code, I have created this form in windows application, the code is to login to the site automatically and downloading the file, and store that in a folder, while debugging I am getting the exception error as “The underlying connection was closed: An unexpected error occurred on a send." and the inner exception is “an existing connection was forcibly closed by the remote host c#”
private void Form1_Load(object sender, EventArgs e)
{
try
{
string formUrl = "https://secure.gmail.com/account/doLogin.html?icmp=HO_LOGIN_BANNER"; // NOTE: This is the URL the form POSTs to, not the URL of the form (you can find this in the "action" attribute of the HTML's form tag
string formParams = string.Format("username={0}&password={1}", "username", "password");
string cookieHeader;
WebRequest req = WebRequest.Create(formUrl);
req.ContentType = "application/x-www-form-urlencoded";
req.Method = "POST";
byte[] bytes = Encoding.ASCII.GetBytes(formParams);
req.ContentLength = bytes.Length;
using (Stream os = req.GetRequestStream())
{
os.Write(bytes, 0, bytes.Length);
}
WebResponse resp = req.GetResponse();
cookieHeader = resp.Headers["Set-cookie"];
string pageSource;
string getUrl = "https://secure.gmail.com/account/summary.html";
WebRequest getRequest = WebRequest.Create(getUrl);
getRequest.Headers.Add("Cookie", cookieHeader);
WebResponse getResponse = getRequest.GetResponse();
using (StreamReader sr = new StreamReader(getResponse.GetResponseStream()))
{
pageSource = sr.ReadToEnd();
}
WebClient Client = new WebClient();
Client.DownloadFile("https://secure.gmail.com.com/account/callActivity/print.csv?lineNumber=16145838755&startDate=MNTH2014-04-24&fragment=true", #"C:\Downloads");
}
catch(Exception ex)
{
throw ex;
}
}
}
}