How to read header data from a web API response in .NET Core?

Question

I am calling the web API methods from my client project and returning the value from response header to client:

[HttpPost]
[AllowAnonymous]
[Route("login")]
public IActionResult Login(Users user)
{
    string s = _repository.Users.ValidateUser(user);
    if (s == "success")
    {
        Users u = _repository.Users.FindByUserName(user.UserName);
        int pid = u.PersonId;
        string role = "";
        if (u != null)
        {

            role = _repository.RoleManager.GetRole(u.Id);
        }
        Response.Headers.Add("Role", role);
        return Ok(pid.ToString());
    }

}

And I tried the code below for getting header value in the client application:

[HttpPost]
public IActionResult Login(Users user)
{    
    string pid = "";
    HttpClient client = service.GetService();
    HttpResponseMessage response = client.PostAsJsonAsync("api/mymethod", user).Result;
    Task<string> tokenResult = response.Content.ReadAsAsync<string>();
    pid = tokenResult.Result.ToString();
       
    var headers = response.Headers;
    string role = "";
    if (headers.TryGetValues("Role", out IEnumerable<string> headerValues))
        {
            role = headerValues.ToString();
        }

    return RedirectToAction("Profile");
}

But it returns System.String[] .

Please show me the right way for fetching data from the response header.

Thanks for reply...it shows reading data from request but I want to read data from response header — Tejas
– Tejas, Commented Dec 8, 2018 at 4:02
Can you add the code of the getRole-method? I think it’s the source of confusion — Nikolaus
– Nikolaus, Commented Dec 8, 2018 at 4:12

Merna Mustafa · Accepted Answer · 2021-11-09 23:45:11Z

7

I found the solution:

var headers = response.Headers;
string role = "";
if (headers.TryGetValues("Role", out IEnumerable<string> headerValues))
{
    role = headerValues.FirstOrDefault();
}

Don't forget to add a reference to System.Linq.

edited Nov 9, 2021 at 23:45

Merna Mustafa

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answered Dec 8, 2018 at 6:32

Tejas

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Comments

janw · Accepted Answer · 2021-11-09 17:37:10Z

1

Using StringValues:

var headers = response.Headers;
string role = "";
if (headers.TryGetValues("Role", out Microsoft.Extensions.Primitives.StringValues headerValues))
{
    role = headerValues.FirstOrDefault();
}

edited Nov 9, 2021 at 17:37

janw

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answered Nov 3, 2021 at 6:37

Idris

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1 Comment

Nurkartiko Over a year ago

I don't know why in my code there is no headers.TryGetValues but headers.TryGetValue with no 's'

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