# News: On March 1, 2021, "Replace (Backward compatibility mode)" will be removed from the permanent link redirection settings for LIFF app and LINE MINI App

On March 1, 2021, "Replace (Backward compatibility mode)" will be removed from the permanent link redirection settings for LIFF app and LINE MINI App

On March 1, 2021, Replace (Backward compatibility mode) in Method for converting additional information in the LIFF URL on the LINE Developers Console will no longer be available. After this change, all LIFF and LINE MINI App URLs will be opened with Concatenate.

How to process additional information in the LIFF URL

Switch the setting to Concatenate for LIFF apps and LINE MINI Apps that are currently set to Replace (Backward compatibility mode) by the discontinuation date.

Continuation of "Replace (Backward compatibility mode)"

After March 1, 2021, environments that don't support Concatenate, such as LINE v10.10.0 or lower and LIFF SDK v2.2.1 or lower, can continue to use Replace (Backward compatibility mode), but the normal operation of the LIFF app and LINE MINI App isn't guaranteed. We recommend migrating to Concatenate.

# Discontinuation schedule (planned)

Date Description
January 11, 2021
  • Deprecation of Replace (Backward compatibility mode)
  • Replace (Backward compatibility mode) will no longer be available when creating new LIFF apps and LINE MINI Apps.
  • Once you change the setting to Concatenate, you can't revert to Replace (Backward compatibility mode).
March 1, 2021 Replace (Backward compatibility mode) will be removed, so the setting will be switched to Concatenate in all LIFF apps and LINE MINI Apps.

# Transition from "Replace (Backward compatibility mode)" to "Concatenate"

If your existing LIFF app or LINE MINI App uses Replace (Backward compatibility mode), do these two things to move to Concatenate by the discontinuation date (February 28, 2021).

# Upgrade your LIFF SDK version to v2.3.0 or later

Versions earlier than v2.3.0 don't support Concatenate, so upgrade to v2.3.0 or later.

If you're already using v2.3.0 or later, you don't need to upgrade.

# Make endpoint URL and LIFF URL correspond to "Concatenate"

When the setting is switched to Concatenate, the path and query parameters (/2020campaign/?key=value) specified in Endpoint URL of the LINE Developers Console will be included in the secondary redirect destination. As a result, the same endpoint URLs and LIFF URLs that were used to set Replace (Backwards compatibility mode) may result in unintended redirects to unintended URLs.

Make Endpoint URL and LIFF URL to be compatible with Concatenate if necessary.

To learn about the difference between Replace (Backward compatibility mode) and Concatenate, see Create a secondary redirect URL in the LIFF documentation.

Verify that the LIFF app and LINE MINI App open correctly after changing the settings

Once you have migrated your existing LIFF app and LINE Mini App settings to Concatenate, verify that the app opens correctly with the new settings. If they don't open correctly, correct the LIFF SDK version, Endpoint URL, and LIFF URL to be compatible with Concatenate.