HTTPExample URLSession Tutorial With swift 3 教學文章 https://medium.com/@jerrywang0420/urlsession-%E6%95%99%E5%AD%B8-swift-3-ios-part-1-a1029fc9c427#.nyv2w2glf https://medium.com/@jerrywang0420/urlsession-%E6%95%99%E5%AD%B8-swift-3-ios-part-2-a17b2d4cc056#.rbgnzkl4d https://medium.com/@jerrywang0420/urlsession-%E6%95%99%E5%AD%B8-swift-3-ios-part-3-34699564fb12#.97zboea8j