On Ocober 20th 2014 we are turning off the legacy “.heroku.com” routing path. To determine which of your apps will be affected, login to your Heroku account and access the legacy routing analyzer tool.
We recommend that you migrate affected apps away from the legacy routing infrastructure as soon as possible.
Heroku Dev Center has instructions on how to move from legacy to current routing.
Update: This notice was updated to reflect that the EOL has been postponed from September 22nd to September 29th.
Update: This notice was updated to reflect that the EOL has been postponed a second time from September 22nd to October 20th.