URL Loading System Programming Guide - Apple Developer

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About the URL Loading System This guide describes the Foundation framework classes available for interacting with URLs and communicating with servers using standard Internet protocols. Together these classes are referred to as the URL loading system . The URL loading system is a set of classes and protocols that allow your app to access content referenced by a URL. At the heart of this technology is the NSURL class, which lets your app manipulate URLs and the resources they refer to. To support that class, the Foundation framework provides a rich collection of classes that let you load the contents of a URL, upload data to servers, manage cookie storage, control response caching, handle credential storage and authentication in app-specific ways, and write custom protocol extensions. The URL loading system provides support for accessing resources using the following protocols: ● ● ● ● ● File Transfer Protocol (ftp://) Hypertext Transfer Protocol (http://) Hypertext Transfer Protocol with encryption (https://) Local file URLs (file:///) Data URLs (data://) It also transparently supports both proxy servers and SOCKS gateways using the user’s system preferences. 2013-10-22 | Copyright © 2003, 2013 Apple Inc. All Rights Reserved. 6
About the URL Loading System At a Glance Important: In addition to the URL loading system, OS X and iOS provide APIs for opening URLs in other applications, such as Safari. These APIs are not described in this document. For more information about Launch Services in OS X, read Launch Services Programming Guide . For more information about the openURL: method in the NSWorkSpace class in OS X, read NSWorkspace Class Reference . For more information about the openURL: method in the UIApplication class in iOS, read UIApplication Class Reference . At a Glance The URL loading system includes classes that load URLs along with a number of important helper classes that work with those URL loading classes to modify their behavior. The major helper classes fall into five categories: protocol support, authentication and credentials, cookie storage, configuration management, and cache management. 2013-10-22 | Copyright © 2003, 2013 Apple Inc. All Rights Reserved. 7
Page 1 and 2: URL Loading System Programming Guid
Page 3 and 4: Contents Making a POST Request 36 R
Page 5: Listings Understanding Cache Access
Page 9 and 10: About the URL Loading System At a G
Page 11 and 12: About the URL Loading System At a G
Page 13 and 14: About the URL Loading System How to
Page 15 and 16: Using NSURLSession The NSURLSession
Page 17 and 18: Using NSURLSession Understanding UR
Page 19 and 20: Using NSURLSession Creating and Con
Page 21 and 22: Using NSURLSession Creating and Con
Page 23 and 24: Using NSURLSession Fetching Data Us
Page 25 and 26: Using NSURLSession Downloading File
Page 27 and 28: Using NSURLSession Uploading Body C
Page 29 and 30: Using NSURLSession Handling iOS Bac
Page 31 and 32: Using NSURLSession Handling iOS Bac
Page 33 and 34: Using NSURLConnection Creating a Co
Page 35 and 36: Using NSURLConnection Creating a Co
Page 37 and 38: Using NSURLConnection Making a POST
Page 39 and 40: Using NSURLConnection Retrieving Da
Page 41 and 42: Using NSURLDownload Downloading to
Page 43 and 44: Using NSURLDownload Downloading a F
Page 45 and 46: Using NSURLDownload Displaying Down
Page 47 and 48: Using NSURLDownload Decoding Encode
Page 49 and 50: Encoding URL Data CFStringRef decod
Page 51 and 52: Handling Redirects and Other Reques
Page 53 and 54: Authentication Challenges and TLS C
Page 55 and 56: Authentication Challenges and TLS C
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Authentication Challenges and TLS C
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Understanding Cache Access Cache Us
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Understanding Cache Access Controll
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Cookies and Custom Protocols Protoc
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Life Cycle of a URL Session Life Cy
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Document Revision History Date 2003
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URL Loading System Programming Guide - Apple Developer

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