---
title: "App Transport Security"
canonical_url: "https://www.nutrient.io/guides/ios/pspdfkit-instant/app-transport-security/"
md_url: "https://www.nutrient.io/guides/ios/pspdfkit-instant/app-transport-security.md"
last_updated: "2026-06-19T09:21:00.273Z"
description: "Connect your Document Engine securely by using an `https` `serverURL`. Learn to implement Apple’s App Transport Security requirements and set ATS exceptions in `Info.plist`."
---

Instant must connect to your Document Engine instance to synchronize documents. You should use a secure `https` `serverURL` when creating the `PSPDFInstantClient` and ensure the server meets [Apple’s App Transport Security requirements](https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW33). If this isn’t possible, ensure the appropriate ATS exceptions are set in the app’s `Info.plist`.
---

## Related pages

- [Advanced CocoaPods integration](/guides/ios/miscellaneous/advanced-cocoapods-integration.md)
- [Airdrop](/guides/ios/features/airdrop.md)
- [Advanced Carthage integration](/guides/ios/miscellaneous/advanced-carthage-integration.md)
- [Bitcode](/guides/ios/faq/bitcode.md)
- [Customizing The Page Number](/guides/ios/customizing-pdf-pages/customizing-the-page-number.md)
- [Carthage integration](/guides/ios/best-practices/carthage-integration.md)
- [Framework Size](/guides/ios/faq/framework-size.md)
- [Optimize PDF documents for mobile rendering on iOS](/guides/ios/miscellaneous/optimize-pdf-documents-for-mobile-rendering.md)
- [Nightly Builds](/guides/ios/best-practices/nightly-builds.md)
- [About Memory Usage](/guides/ios/memory-and-storage/about-memory-usage.md)
- [Customizing the log level on iOS](/guides/ios/features/logging.md)
- [Reduce App Size](/guides/ios/best-practices/reduce-app-size.md)
- [Modifying permissions in your iOS app](/guides/ios/getting-started/permissions.md)
- [Powered By Nutrient](/guides/ios/miscellaneous/powered-by-nutrient.md)
- [Transferring File Edits To A Server](/guides/ios/best-practices/transferring-file-edits-to-a-server.md)
- [iOS PDF SDK security](/guides/ios/faq/sdk-security.md)
- [Saving Data Externally](/guides/ios/memory-and-storage/saving-data-externally.md)
- [Strategies For Multiple Bundle Ids](/guides/ios/faq/strategies-for-multiple-bundle-ids.md)
- [Third Party Compatibility](/guides/ios/miscellaneous/third-party-compatibility.md)
- [Manage your iOS status bar with view controllers](/guides/ios/faq/view-controller-based-status-bar-appearance.md)
- [Using Document Efficiently](/guides/ios/getting-started/using-document-efficiently.md)
- [Using Automatic Saving Safely](/guides/ios/best-practices/using-automatic-saving-safely.md)
- [Version Numbering](/guides/ios/best-practices/version-numbering.md)
- [Youtube Links](/guides/ios/miscellaneous/youtube-links.md)