If your account has been migrated to a Mojang account but you're logging in with your username the server will return 'Account migrated, use e-mail'.Įvery 6000 ticks, the client sends an HTTPS request to

If the login information is correct but the account isn't premium, the server will return 'User not premium'.

If the login information is incorrect, the server will return 'Bad login'. If the request is missing a parameter, the server will return 'Bad response'. Grum says this is the unique ID for the user, potentially for changing Minecraft names in future. UID - currently unused, introduced near August 8th, 2012.sessionId - a unique ID for your current session.For mojang accounts, the user's actual username is returned here instead of the email used to log in. Previously contained a download ticket for requesting new versions of minecraft.jar from the server.This is a unix timestamp which the launcher compares to the ~/.minecraft/bin/version file. current version of the game files (not the launcher itself).To log the player in, the official launcher sends an HTTPS POST (GET appears to suffice as well) request to:Īnd a 'application/x-The current launcher version is '13' (for new launcher it's '14'), sending a value lower than 12 will cause the server to return 'Old version', however, you can send any large number and it will return as expected. Attention: The mechanics described in this article are no longer used by the latest version of Minecraft.įor the currently used authentication system see Microsoft Authentication Scheme, for the legacy Mojang authentication see Authentication.

Legacy launcher for minecraft