URL Loading System Programming Guide - Apple Developer

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Contents About the URL Loading System 6 At a Glance 7 URL Loading 8 Helper Classes 9 Redirection and Other Request Changes 10 Authentication and Credentials 11 Cache Management 12 Cookie Storage 12 Protocol Support 12 How to Use This Document 13 See Also 13 Using NSURLSession 15 Understanding URL Session Concepts 15 Types of Sessions 15 Types of Tasks 16 Background Transfer Considerations 16 Life Cycle and Delegate Interaction 17 NSCopying Behavior 18 Sample Delegate Class Interface 18 Creating and Configuring a Session 19 Fetching Resources Using System-Provided Delegates 22 Fetching Data Using a Custom Delegate 23 Downloading Files 23 Uploading Body Content 26 Uploading Body Content Using an NSData Object 27 Uploading Body Content Using a File 27 Uploading Body Content Using a Stream 27 Uploading a File Using a Download Task 28 Handling Authentication and Custom TLS Chain Validation 28 Handling iOS Background Activity 29 Using NSURLConnection 32 Creating a Connection 32 2013-10-22 | Copyright © 2003, 2013 Apple Inc. All Rights Reserved. 2
Contents Making a POST Request 36 Retrieving Data Using a Completion Handler Block 38 Retrieving Data Synchronously 38 Using NSURLDownload 40 Downloading to a Predetermined Destination 40 Downloading a File Using the Suggested Filename 42 Displaying Download Progress 44 Resuming Downloads 46 Decoding Encoded Files 46 Encoding URL Data 48 Handling Redirects and Other Request Changes 50 Authentication Challenges and TLS Chain Validation 53 Deciding How to Respond to an Authentication Challenge 53 Responding to an Authentication Challenge 54 Providing Credentials 54 Continuing Without Credentials 55 Canceling the Connection 56 An Authentication Example 56 Performing Custom TLS Chain Validation 57 Understanding Cache Access 58 Using the Cache for a Request 58 Cache Use Semantics for the HTTP Protocol 59 Controlling Caching Programmatically 59 Cookies and Custom Protocols 62 Cookie Storage 62 Protocol Support 63 Life Cycle of a URL Session 64 Life Cycle of a URL Session with System-Provided Delegates 64 Life Cycle of a URL Session with Custom Delegates 66 Document Revision History 70 2013-10-22 | Copyright © 2003, 2013 Apple Inc. All Rights Reserved. 3
Page 1: URL Loading System Programming Guid
Page 5 and 6: Listings Understanding Cache Access
Page 7 and 8: 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:
Page 57 and 58:
Page 59 and 60:
Understanding Cache Access Cache Us
Page 61 and 62:
Understanding Cache Access Controll
Page 63 and 64:
Cookies and Custom Protocols Protoc
Page 65 and 66:
Life Cycle of a URL Session Life Cy
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Document Revision History Date 2003
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URL Loading System Programming Guide - Apple Developer

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