Comments by Adi_Mag (Top 5 by date)

One more point :
Get Rest Endpoint : http://www.customerservices.com/Customers/{id}?access_token=12345
Is it a right approach?
My earlier approach was to send this access_token in DefaultRequestHeader. But defaultRequsetHeader Causes Issue.

Thanks a lot.

I have used parallel because multiple clients try to access the application. I am mimicking the real time scenario.

My application flow is client===>webapi===>authentication server. We get accesstoken from client request. Then we connect to authentication server for validation. For this validation, we are using httpclient. We need to set the access header of the httpclient with access token. If I use the same instance of HttpClient then the race condition comes up.

Simple POC :

Parallel.For(0, 10,
i =>
{
var guidData = Guid.NewGuid().ToString();
_httpClient.DefaultRequestHeaders.Clear();
_httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
_httpClient.DefaultRequestHeaders.Add("Guid", guidData);
var response = _httpClient.GetAsync("http://localhost:2967/api/service/GetData").GetAwaiter().GetResul();
var data = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
Console.WriteLine(data);
Console.WriteLine("===============");
});

Error : Getting error, the guid is already added.