FilteringClient.swift

struct RGB: Decodable {
    var red: Int
    var green: Int
    var blue: Int
    
    enum CodingKeys: String, CodingKey {
        case red = "Red"
        case green = "Green"
        case blue = "Blue"
    }
}

struct Colour: Decodable {
    var id: String
    var name: String
    var hex: String
    var rgb: RGB
    
    enum CodingKeys: String, CodingKey {
        case id = "Id"
        case name = "Name"
        case hex = "Hex"
        case rgb = "RGB"
    }
}

private func loadColours() {
    let url = URL(string: "http://localhost:5000/my-colours")!
    var request = URLRequest(url: url)
    request.setValue("application/vnd.chamook.api+json; including=id,name,hex,rgb", forHTTPHeaderField: "Accept")
    ...
}