post application/x-www-form-urlencoded Alamofire - ios

Question

I want to use Alamofire to retrieve a bearer token from Web API but I am new to ios and alamofire. How can I accomplish this with Alamofire?
func executeURLEncodedRequest(url: URL, model: [String : String]?, handler: RequestHandlerProtocol) {
addAuthorizationHeader()
Alamofire.request(.POST,createUrl(url), parameters: model, headers: headers,encoding:.Json)
}

Answer 1

Well you don't really need Alamofire to do this (it can be simply done using a plain NSURLRequest) but here goes:
let headers = [
"Content-Type": "application/x-www-form-urlencoded"
]
let parameters = [
"myParameter": "value"
]
let url = NSURL(string: "https://something.com")!
Alamofire.request(.POST, url, parameters: parameters, headers: headers, encoding: .URLEncodedInURL).response { request, response, data, error in
print(request)
print(response)
print(data)
print(error)
}
I think that the headers can be omitted since alamofire will append the appropriate Content-Type header. Let me know if it works.
You can also find a ton of specification with examples here.

Answer 2

Alamofire 4.7.3 and Swift 4.0 above
As per the documentation for POST Request With URL-Encoded Parameters
let parameters: Parameters = [
"foo": "bar",
"val": 1
]
// All three of these calls are equivalent
Alamofire.request("https://httpbin.org/post", method: .post, parameters: parameters)
Alamofire.request("https://httpbin.org/post", method: .post, parameters: parameters, encoding: URLEncoding.default)
Alamofire.request("https://httpbin.org/post", method: .post, parameters: parameters, encoding: URLEncoding.httpBody)
// HTTP body: foo=bar&val=1
Alamofire 5.2
let parameters: [String: [String]] = [
"foo": ["bar"],
"baz": ["a", "b"],
"qux": ["x", "y", "z"]
]
// All three of these calls are equivalent
AF.request("https://httpbin.org/post", method: .post, parameters: parameters)
AF.request("https://httpbin.org/post", method: .post, parameters: parameters, encoder: URLEncodedFormParameterEncoder.default)
AF.request("https://httpbin.org/post", method: .post, parameters: parameters, encoder: URLEncodedFormParameterEncoder(destination: .httpBody))
// HTTP body: "qux[]=x&qux[]=y&qux[]=z&baz[]=a&baz[]=b&foo[]=bar"

Answer 3

Here is example code that should work with Alamofire 4.x and Swift 3.x as of August 2017:
let parameters = [
"myParameter": "value"
]
Alamofire.request("https://something.com", method: .post, parameters: parameters, encoding: URLEncoding()).response { response in
print(response.request)
print(response.response)
print(response.data)
print(response.error)
}
There is no need to set the content-type header explicitly, as it is set by Alamofire automatically.