How to add Alamofire URL parameters

The problem is that you’re using URLEncoding.default. Alamofire interprets URLEncoding.default differently depending on the HTTP method you’re using.

For GET, HEAD, and DELETE requests, URLEncoding.default encodes the parameters as a query string and adds it to the URL, but for any other method (such as POST) the parameters get encoded as a query string and sent as the body of the HTTP request.

In order to use a query string in a POST request, you need to change your encoding argument to URLEncoding(destination: .queryString).

You can see more details about how Alamofire handles request parameters here.

Your code should look like:

   _url = "http://localhost:8080/"
    let parameters: Parameters = [
        "test": "123"
        ]

    Alamofire.request(_url,
                      method: .post,
                      parameters: parameters,
                      encoding: URLEncoding(destination: .queryString),
                      headers: headers)