v0.6.0

This release introduces support for the Box metadata API as well as some major performance improvements. Features include:

• Metadata. You can now manipulate metadata properties associated with a BoxFile. Metadata allows your application to define and store custom data associated with files. For more information on Box metadata, see the documentation.
• Shared item support. You can now retrieve items using their shared link. The SDK automatically handles shared link authentication, making it easy to access shared items and their children.
• Request interceptors. Requests can be intercepted before they're sent to the API, allowing for applications to modify requests or prevent them from being sent entirely.
• Performance improvements to persistent connections. HTTP keep-alive now works much more consistently, giving a massive performance boost to applications that send a large number of requests.
• OAuth is now thread safe. OAuth refresh logic is now thread-safe, making authentication more reliable in multithreaded applications.
• Support for OAuth refresh listeners. BoxAPIConnection now supports listeners that will be notified whenever an OAuth refresh happens. This makes it easier for applications to save authentication information for persistent logins.

Major bug fixes for this release include:

• Fix restoring API connections from access and refresh tokens. A bug was fixed where restoring an API connection using saved access and refresh tokens would cause a token refresh error.
• Fix crash when receiving a large number of duplicate events. When a large number of duplicate events was received, an exception would be thrown. This was caused by the EventStream's LRU not removing items correctly.
• Fix bug when sending non-ASCII characters. The content length of requests with non-ASCII characters was being calculated incorrectly.