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

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

Added on February 2, 2021

We have added a way to address cases in which the Replace (Backward compatibility mode) specification still requires a transition to a secondary redirect URL, even after migrating your LIFF App or LINE MINI App to Concatenate. For more information, see Convert URL generated by "Concatenate" to URL of "Replace (Backward compatibility mode)" specification.

Changes from the news for November 20, 2020

In the November 20, 2020 news, the day when it will not be possible to return to Replace (Backward compatibility mode) once Method for converting additional information in the LIFF URL is set to Concatenate was announced as January 11, 2021. However, the schedule was changed to January 19, 2021. For more information about the updated schedule, see Discontinuation schedule.

As announced on November 20, 2020, 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

Date Description
January 11, 2021
January 19, 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.

# Convert URL generated by "Concatenate" to URL of "Replace (Backward compatibility mode)" (Added on February 2, 2021)

Even after migrating your LIFF app or LINE MINI App to Concatenate, if the Replace (Backward compatibility mode) specification still requires transition to a secondary redirect URL, use the function that converts URL generated by "Concatenate" to URL of "Replace (Backward compatibility mode)".

We are providing this function for a limited time only.

Example code for converting URL generated by "Concatenate" to URL of "Replace (Backward compatibility mode)" specification in the LIFF documentation is intended to support the migration to Concatenate, due to the discontinuation of Replace (Backward compatibility mode). Some time after the discontinuation of Replace (Backward compatibility mode), we may delete this page. If you wish to check the conversion method even after the page is deleted, download the function that converts secondary redirect URL generated by "Concatenate", and refer to the code as necessary.