It is strongly recommended to use https in SharePoint Provider Hosted Apps. In many provider hosted apps I have seen, only https works. I would recommend to configure a simple http to https redirect in IIS and make solutions better. Many Provider Hosted Apps can be done in that way that they are available without SharePoint Context, e.g. for browsing information. In that case that is important to have an easy url and an automatic http -> https redirect.

Have you noticed that you can right-click a web application project in Visual Studio and convert it to a provider hosted app? Well why not? Basically your own website and a SharePoint manifest is all what you need for a provider hosted app. This discovery today made me think about all legacy web apps out there that can be converted to SharePoint apps. Traditionally we had to add plain links to external applications or embed them into an IFrame by hardcoding it in an .