struct Something: Codable {
    var thing: String? = nil
}
var request = URLRequest(URL(string: path)!)
request.httpMethod = "PUT"
headers.dictionary.forEach {
    request.addValue(_ value: $0.value, forHTTPHeaderField: $0.key)
}
request.httpBody = try? JSONEncoder().encode([something])
AF.request(request).responseJSON { ...}