How do I get Http Header of calling API from a WebApi

Question

I have two WebApi (.NET Core) application e.g. WebApi1 and WebApi2. Now I am calling/consuming WebApi1 (endpoint) from WebApi2. How do I get WebApi1 Http Header values from WebApi2 application?

Tried with Request.Header; but did not get WebApi1 headers. Here is the code written in controller action -

                    (Request?.Headers ?? throw new Exception("Http Header is Null")).ToDictionary<KeyValuePair<string, StringValues>, string, string>(
                        header => header.Key, header => header.Value);

here I am getting WebApi2 header.

Can you also provide the code you tried to get the header ? Not just the Request.Header instruction, the relevant parts of the method. — Skrface
– Skrface, Commented May 23, 2019 at 11:54

Edward · Accepted Answer · 2019-05-24 02:32:24Z

1

For calling web api1 from api2, you could try HttpClient like:

[Route("api/[controller]")]
[ApiController]
public class ValuesController : ControllerBase
{
    private readonly HttpClient _client;
    public ValuesController(IHttpClientFactory httpClientFactory)
    {
        _client = httpClientFactory.CreateClient();
    }
    // GET api/values
    [HttpGet]
    public async Task<ActionResult<IEnumerable<string>>> Get()
    {
        var response = await _client.GetAsync("https://localhost:44349/api/values");
        var headers = response.Headers.ToList();
        return new string[] { "value1", "value2" };
    }

And register the HttpClient by

public void ConfigureServices(IServiceCollection services)
{
    services.AddHttpClient();
    services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
}

answered May 24, 2019 at 2:32

Edward

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Comments

Debasis Ghosh · Accepted Answer · 2019-05-24 11:55:04Z

0

I missed "Enable CORS" in my application.

https://learn.microsoft.com/en-us/aspnet/core/security/cors?view=aspnetcore-2.2

options.AddPolicy(MyAllowSpecificOrigins,
        builder =>
        {
            builder.WithOrigins("http://example.com",
                                "http://www.contoso.com")
                                **.AllowAnyHeader()**
                                .AllowAnyMethod();
        });

here "AllowAnyHeader" required to pass custom header. Now I am able to capture custom http header.

answered May 24, 2019 at 11:55

Debasis Ghosh

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