Would it be possible to start on the Android phone background running service which will listen on a certain port for incoming local http connections and communicate with the the built-in web browser (I am not talking about the web view), Opera or Dolphin browser by capturing all such localhost calls – http://localhost:8081/serviceCall?
The goal is to make a tiny webserver running on Android phone, which can deliver the web browser some information, the browser does not have access to. But I am not sure if there are not some security restrictions, etc.
BR
Petr
Is it technically possible? Sure.
Is it wise? Only if you are a security expert or have a large legal defense fund. You will not be just sending data to “the built-in web browser”, but to any application that chooses to make HTTP requests.