URL Session Configuration

Overview

URL Session Configuration allows control over:

• Network service type
  • Timeouts
  • Caching
  • HTTP headers
• Default configuration uses a persistent disk-based cache and stores credentials in the user’s keychain.
• Different types of configurations:
  • Default Configuration: Standard settings, stores data persistently.
  • Ephemeral Configuration: Does not store cookies, credentials, or cache data to disk.
  • Background Configuration: Allows data transfer when the app runs in the background and requires an identifier.

Configuration Properties

• Configurations allow customization of several properties before creating a URL session, such as:
  • Cellular access
  • Request timeouts
  • Cookie acceptance
  • Waiting for connectivity
• Changes to configuration must be made before session creation; subsequent changes have no effect.

Example Walkthrough in Playground

• To create a session configuration:
  • Access the shared singleton session object.
  • Configuration properties become read-only after session creation.
• Changing Properties Example:
  • Set allowCellularAccess to false.
  • Create configuration object via static property on URLSessionConfiguration.
  • For background configurations, provide an identifier for session reconstruction.

Best Practices

• Allow Cellular Access: Can be set to false as needed.
• Waits for Connectivity: Apple recommends setting to true for all non-background configurations.
• Creating a new session with custom configurations ensures it uses specified settings.
• Default session creation uses default property values without modification.

Additional Resources

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• Check NSURLSessionConfiguration documentation for more details on configuration options and properties.