How to add and get Header values in WebApi

Question

I need to create a POST method in WebApi so I can send data from application to WebApi method. I\'m not able to get header value.

Here I have added header values in

Answer 1

For .net Core in GET method, you can do like this:

 StringValues value1;
 string DeviceId = string.Empty;

  if (Request.Headers.TryGetValue("param1", out value1))
      {
                DeviceId = value1.FirstOrDefault();
      }

Answer 2

Another way using a the TryGetValues method.

public string Postsam([FromBody]object jsonData)
{
    IEnumerable<string> headerValues;

    if (Request.Headers.TryGetValues("Custom", out headerValues))
    {
        string token = headerValues.First();
    }
}   

Answer 3

Suppose we have a API Controller ProductsController : ApiController

There is a Get function which returns some value and expects some input header (for eg. UserName & Password)

[HttpGet]
public IHttpActionResult GetProduct(int id)
{
    System.Net.Http.Headers.HttpRequestHeaders headers = this.Request.Headers;
    string token = string.Empty;
    string pwd = string.Empty;
    if (headers.Contains("username"))
    {
        token = headers.GetValues("username").First();
    }
    if (headers.Contains("password"))
    {
        pwd = headers.GetValues("password").First();
    }
    //code to authenticate and return some thing
    if (!Authenticated(token, pwd)
        return Unauthorized();
    var product = products.FirstOrDefault((p) => p.Id == id);
    if (product == null)
    {
        return NotFound();
    }
    return Ok(product);
}

Now we can send the request from page using JQuery:

$.ajax({
    url: 'api/products/10',
    type: 'GET',
    headers: { 'username': 'test','password':'123' },
    success: function (data) {
        alert(data);
    },
    failure: function (result) {
        alert('Error: ' + result);
    }
});

Hope this helps someone ...

Answer 4

For .NET Core:

string Token = Request.Headers["Custom"];

Or

var re = Request;
var headers = re.Headers;
string token = string.Empty;
StringValues x = default(StringValues);
if (headers.ContainsKey("Custom"))
{
   var m = headers.TryGetValue("Custom", out x);
}

Answer 5

For WEB API 2.0:

I had to use Request.Content.Headers instead of Request.Headers

and then i declared an extestion as below

  /// <summary>
    /// Returns an individual HTTP Header value
    /// </summary>
    /// <param name="headers"></param>
    /// <param name="key"></param>
    /// <returns></returns>
    public static string GetHeader(this HttpContentHeaders headers, string key, string defaultValue)
    {
        IEnumerable<string> keys = null;
        if (!headers.TryGetValues(key, out keys))
            return defaultValue;

        return keys.First();
    }

And then i invoked it by this way.

  var headerValue = Request.Content.Headers.GetHeader("custom-header-key", "default-value");

I hope it might be helpful

Answer 6

On the Web API side, simply use Request object instead of creating new HttpRequestMessage

     var re = Request;
    var headers = re.Headers;

    if (headers.Contains("Custom"))
    {
        string token = headers.GetValues("Custom").First();
    }

    return null;

Output -