Http+Rx.swift

import RxSwift
import RxCocoa

let BASE_URL = ""

enum HttpMethod: String {
    case get = "GET"
    case post = "POST"
}

struct Http {
    let url: URL
    let body: Data?
    let method: HttpMethod
    let headers: [ String: String ]
    
    init(url: String, body: Data? = nil, method: HttpMethod = HttpMethod.get, headers: [ String: String ] = [:]) {
        guard let url = URL(string: url) else {
            fatalError("URL could not be infered.")
        }
        
        self.url = url
        self.body = body
        self.method = method
        self.headers = headers
    }
}

func request(http: Http) -> Single<Data> {
    #if DEBUG
    print("====>>>>")
    print(http.url.absoluteString)
    print("------------")
    #endif
    var urlRequest = URLRequest(url: http.url)
    
    urlRequest.httpBody = http.body
    urlRequest.httpMethod = http.method.rawValue
    urlRequest.allHTTPHeaderFields = http.headers
    
    return URLSession.shared.rx.data(request: urlRequest).do(onNext: { data in
        #if DEBUG
        print("data size: \(data.count)")
        #endif
    }, onError: { error in
        #if DEBUG
        print("error: \(error?.localizedDescription ?? "without error")")
        print("<<<<====")
        #endif
    }).asSingle()
}