I am integrating with Magento 2, using RESTful APIs. When I use postman, it works like charm, while in C# code, it returns "Unauthorized 401" exception.
However, It was working in C# code earlier, but suddenly it stopped working.
I have tried every way, I tried (WebRequest, HTTPClient & RESTsharp) the same exception returned.
Also, I am using Fiddler 4 to catch & match the requests, I used Fiddler to C# plugins to extract C# code, also I used the RESTsharp Code of Postman same exception returned.
The remote server returned an error: (401) Unauthorized.
//Calls request functions sequentially.
private string MakeRequests()
{
HttpWebResponse response;
if (Request_hatolna_co(out response))
{
//Success, possibly uses response.
string responseText = ReadResponse(response);
response.Close();
return responseText;
}
else
{
//Failure, cannot use response.
return "";
}
}
private static string ReadResponse(HttpWebResponse response)
{
using (Stream responseStream = response.GetResponseStream())
{
Stream streamToRead = responseStream;
if (response.ContentEncoding.ToLower().Contains("gzip"))
{
streamToRead = new GZipStream(streamToRead, CompressionMode.Decompress);
}
else if (response.ContentEncoding.ToLower().Contains("deflate"))
{
streamToRead = new DeflateStream(streamToRead, CompressionMode.Decompress);
}
using (StreamReader streamReader = new StreamReader(streamToRead, Encoding.UTF8))
{
return streamReader.ReadToEnd();
}
}
}
private bool Request_hatolna_co(out HttpWebResponse response)
{
response = null;
try
{
//Create a request to URL.
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://MAGENTO.co/index.php/rest//V1/orders/items?searchCriteria[filter_groups][0][filters][0][field]=item_id&searchCriteria[filter_groups][0][filters][0][value]=1");
//Set request headers.
request.KeepAlive = true;
request.Headers.Set(HttpRequestHeader.Authorization, "Bearer xxxxxxxxxxxxxxxxxxxxxx");
request.Headers.Add("Postman-Token", @"1181fa03-4dda-ae84-fd31-9d6fbd035614");
request.Headers.Set(HttpRequestHeader.CacheControl, "no-cache");
request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36";
request.ContentType = "application/json";
request.Accept = "*/*";
request.Headers.Set(HttpRequestHeader.AcceptEncoding, "gzip, deflate");
request.Headers.Set(HttpRequestHeader.AcceptLanguage, "en-US,en;q=0.9,ar;q=0.8,la;q=0.7");
request.Headers.Set(HttpRequestHeader.Cookie, @"store=default; private_content_version=f16533d4f181d42a1b3f386fa6d2cdf1");
//Get response to request.
response = (HttpWebResponse)request.GetResponse();
}
catch (WebException e)
{
//ProtocolError indicates a valid HTTP response, but with a non-200 status code (e.g. 304 Not Modified, 404 Not Found)
if (e.Status == WebExceptionStatus.ProtocolError) response = (HttpWebResponse)e.Response;
else return false;
}
catch (Exception)
{
if (response != null) response.Close();
return false;
}
return true;
}
The problem was in the URL, where Magento's (Server's) Admin Changed it to [HTTPS] instead of [HTTP].
That concludes the difference between [Postman, Insomnia, or any other API app] & the C# code, that C# doesn't handle the [HTTP vs HTTPs], while the API app can handle it.