How do popular apps authenticate user requests from their mobile app to their server?

I imagine they use a “token” based security system, so the password is actually never stored anywhere, just used the first time to authenticate. So the app initially posts the username/password (over ssl) and the server returns a token that the app stores. For subsequent sync attempts the token is sent first, the server checks … Read more

Foursquare API for venue user image error

I don’t know its right or not to show the way to Foursquare. But what I have investigated that Foursquare creates thumbnails of sizes 30 x 30 and 110 x 110 etc. I formed the image path like this for small image user->photo->prefix.’30×30′.user->photo->suffix; for larger size user->photo->prefix.’110×110′.user->photo->suffix; That is I have concatenated them with (30×30) … Read more