Hamburg, Germany: the public transport services released a new app a few months ago which assumes that the request failed when the app has not finished receiving an answer to a route query after a given time span. The problem: It is normal to have a data cap that, when reached, limits the rate to 64 kbit/s. That is too slow for the answer to be fully transmitted in time...

At least the website works, even though it transmits the full site for every request...