FakeAPI.swift

import Resty

struct Todo: Codable {
    let id: Int
    let title: String
    let completed: Bool
}

enum FakeAPI: Resty {
    case todos
    // other endpoints
}

extension FakeAPI {
    var host: String {
        return "https://jsonplaceholder.typicode.com/"
    }

    var path: String {
        return ""
    }

    var endpoint: String {
        switch self {
        case .todos:
            return "todos"
        }
    }

    var method: HTTPMethod {
        switch self {
        case .todos:
            return .get
        }
    }

    var parameters: [String: Any]? {
        return nil
    }

    var headers: [String: String]? {
        return nil
    }
}

MyService.swift

enum MyService {
   case zen
   case showUser(id: Int)
   case createUser(firstName: String, lastName: String)
   case updateUser(id: Int, firstName: String, lastName: String)
   case showAccounts
}

MyServiceExtension.swift

// MARK: - Resty Protocol Implementation
extension MyService: Resty {
    var host: String {
        return "https://jsonplaceholder.typicode.com/"
    }

    var path: String {
        return ""
    }
    
    var endpoint: String {
        switch self {
        case .zen:
            return "/zen"
        case .showUser(let id), .updateUser(let id, _, _):
            return "/users/\(id)"
        case .createUser(_, _):
            return "/users"
        case .showAccounts:
            return "/accounts"
        }
    }
    var method: HTTPMethod {
        switch self {
        case .zen, .showUser, .showAccounts:
            return .get
        case .createUser, .updateUser:
            return .post
        }
    }
    
    var parameters: [String: Any]? {
        return nil
    }

    var headers: [String: String]? {
        return ["Content-type": "application/json"]
    }
}

Sample.swift

FakeAPI.todos.request(type: [Todo].self) { result in
     switch result {
        case let .success(todos):
                // Array of [Todo]                
        case let .failure(error):
                // error                
     }     
}

SampleRequest.swift

MyService.zen.request(type: [Todo].self) { result in
     switch result {
        case let .success(todos):
                // Array of [Todo]                
        case let .failure(error):
                // error                
     }     
}