RESTful APIs can exchange data using a variety of encoding formats. By far the most common format today is JSON. In a typical Angular application, this is the format used by the server for sending data in response to a GET request and by the client when sending data with a POST or PUT request. Even though JSON is quite common, the client and the server are supposed to notify each other that this is the format being used by using header. For JSON, the proper content-type is:
for compatibility reasons, however, many servers will specify the type as:
The good news, however, is that Angular will assume that you are using JSON and will handle the details for you.