Usually it depends on how complex and interdependent your site software has become. How many places do you have to find and fix where "http:" was hard coded? Ho

Usually it depends on how complex and interdependent your site software has become. How many places do you have to find and fix where "http:" was hard coded? How many existing links and web APIs are going to break if you start returning redirects? How many third-party affiliates and SDK partners are going to be affected by your change? Are you going to discard everyone's existing sessions? How are you going to test all this stuff in advance?