How to add Alamofire URL parameters

Question

I have a working scenario using Postman passing in URL parameters. Now when I try to do it via Alamofire in Swift, it does not work.

How would you create this url in Alamofire? http://localhost:8080/?test=123

    _url = "http://localhost:8080/"     let parameters: Parameters = [         "test": "123"         ]      Alamofire.request(_url,                       method: .post,                       parameters: parameters,                       encoding: URLEncoding.default,                       headers: headers 

Answer 1

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) 

Answer 2

If you want your parameters to be used in querystring, use .queryString as URLEncoding, as in: (I assume you have headers somewhere)

let _url = "http://localhost:8080/" let parameters: Parameters = [     "test": "123"     ]  Alamofire.request(_url,         method: .post,         parameters: parameters,         encoding: URLEncoding.queryString,         headers: headers) 

This form is suggested by Alamofire author because it's more coincise to the other, see screenshot:

See original here