>we end up in a world of RESTful APIs, some well-documented and some not-so-well-documented, and, when one emerges as the winner, it becomes the de facto protoc

>we end up in a world of RESTful APIs, some well-documented and some not-so-well-documented, and, when one emerges as the winner, it becomes the de facto protocol. Can you give an example of a proprietary RESTful API that then became a de facto standard protocol that was supported by a wide variety of software (both clients and servers)?