I am getting "the remote server returned an error (400) bad request."

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Getting "the remote server returned an error (400) bad request." while getting the response from an API call(URL is provided by Client which i pass correctly).
While calling the same from postman its working properly, but from C# code it is not working.
I am getting error on below line

StreamReader responseReader = new StreamReader(webRequest.GetResponse().GetResponseStream())

What I have tried:

WebRequest webRequest = WebRequest.Create(oAuthType.Auth_URL);
webRequest.Method = "POST";
webRequest.ContentType = "application/x-www-form-urlencoded";

string strBLine = @"grant_type:password
                            username:***
                            password:**e
                            scope:esbcom-sms
                            client_id:ro.****e
                            client_secret:ro.**e
                            ";

char[] delims = new[] { '\r', '\n' };

string[] strings = strBLine.Replace(" ","").Split(delims, StringSplitOptions.RemoveEmptyEntries);

byte[] byteArray = Encoding.UTF8.GetBytes(strings.ToString());

webRequest.ContentLength = byteArray.Length;

StreamWriter requestWriter2 = new StreamWriter(webRequest.GetRequestStream());
                        
requestWriter2.Write(strBLine.Replace(" ", "").Split(delims, StringSplitOptions.RemoveEmptyEntries));
requestWriter2.Close();

string responseData = string.Empty;
using (StreamReader responseReader = new StreamReader(webRequest.GetResponse().GetResponseStream()))
{
    responseData = responseReader.ReadToEnd();
}

Posted 26-Nov-20 1:55am

Sharad singh

Updated 26-Nov-20 3:18am

Richard Deeming

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Answer 1 · 2020-11-26T03:18:00

Quote:

byte[] byteArray = Encoding.UTF8.GetBytes(strings.ToString());

The strings variable is an array of strings.

Calling .ToString() on that variable will return the type name: "System.String[]"

Similarly, passing a string array to StreamWriter.Write will call .ToString() on that array, and send the literal string "System.String[]" to the request.

Hence your request is invalid.

Even if you sent the individual lines correctly, it would not be a correct application/x-www-form-urlencoded payload.

Fix your code to send the correct data in the request:

WebRequest webRequest = WebRequest.Create(oAuthType.Auth_URL);
webRequest.Method = "POST";
webRequest.ContentType = "application/x-www-form-urlencoded";

const string requestBody = "grant_type=password&username=***&password:**e&scope:esbcom-sms&client_id:ro.****e&client_secret:ro.**e";

webRequest.ContentLength = Encoding.UTF8.GetByteCount(requestBody);

using (StreamWriter requestWriter = new StreamWriter(webRequest.GetRequestStream()))
{
    requestWriter.Write(requestBody);
}

string responseData;
using (StreamReader responseReader = new StreamReader(webRequest.GetResponse().GetResponseStream()))
{
    responseData = responseReader.ReadToEnd();
}

If it still doesn't work, then you need to capture your network request and compare it to the request sent by Postman.

I am getting "the remote server returned an error (400) bad request."

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I am getting "the remote server returned an error (400) bad request."

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