Supported push methods
- Pushing content to a browser channel: This method delivers content to the browser cache and adds an icon on the Home screen as an entry point to the content. Clicking the icon opens the pushed content in the browser.
- Pushing content to the message list: This method delivers content to the message list, where it appears as an item in the list. Clicking the item in the message list displays the pushed content in the browser.
- Pushing content to the browser cache: This method delivers content to the cache, but provides no notification to the user. The next time the user accesses the content, the updated cached content is displayed.
The default amount of time that pushed content is stored in cache memory depends on the version of the BlackBerry® Device Software is running on the device. In BlackBerry Device Software version 3.8 or later, pushed content is cleared from the cache after 12 hours. On devices running an earlier version of the BlackBerry Device Software, pushed content expires and is cleared from the cache after 29 days.
To increase or decrease the time content is stored in cache memory, you can specify a date and time in the HTTP header of the push request with the Expires header. For example, the following header will store content in cache until December 31, 2018 at 12PM GMT.
Expires: Wed, 31 Dec 2018 24:00:00 GMT
Content might be cleared from the cache prior to the value specified in the Expires header. If the BlackBerry device runs low on flash memory, the browser cache might be cleared to free up space, or the user might choose to manually clear the pushed content cache.