Demo HTTP client for RESTful services in Swift 2.0

HttpClient.swift

import Foundation

class HttpClient: NSObject {
    
    let logging = true
    let session = NSURLSession.sharedSession()
    
    func makeRequest(request: NSURLRequest, completionHandler: (NSDictionary?, NSURLResponse?, NSError?) -> Void) {
        
        logRequest(request)
        let startTime = NSDate()
        session.dataTaskWithRequest(request) { (data: NSData?, response: NSURLResponse?, error: NSError?) -> Void in
        
            self.logResponse(response, timeInterval: NSDate().timeIntervalSinceDate(startTime))
            
            guard let d = data else { completionHandler(nil, response, error); return }
            
            do {
                
                let json = try NSJSONSerialization.JSONObjectWithData(d, options: NSJSONReadingOptions.AllowFragments) as! [String:AnyObject]
                completionHandler(json, response, error)
                
            } catch let e as NSError {
                
                completionHandler(nil, response, e)
                
            }
            
        }.resume()
    }
    
    func getJSON(path: String, completionHandler: (NSDictionary?, NSURLResponse?, NSError?) -> Void) {
        
        let request = NSMutableURLRequest(URL: NSURL(string: path)!)
        request.HTTPMethod = "GET"
        request.addValue("HttpClient 1.0", forHTTPHeaderField: "User-Agent")

        makeRequest(request) { (data: NSDictionary?, response: NSURLResponse?, error: NSError?) -> Void in
            completionHandler(data, response, error)
        }
        
    }
    
    func logRequest(request: NSURLRequest) {
        if logging {
            print("\(request.HTTPMethod!) '\(request.URL!)'")
        }
    }
    
    func logResponse(response: NSURLResponse?, timeInterval: NSTimeInterval) {
        if logging {
            if let response = response as? NSHTTPURLResponse {
                print("\(response.statusCode) '\(response.URL!)' \(NSString(format: "[%0.4f s]", timeInterval))")
            }
        }
    }
    
}