The GET method
The GET method is used to query an existing score or the GUIDO engine itself.
The HTTP request entity-body is ignored and should be empty.
The scope of the request is indicated by the path of the URI.
Replies to GET queries are formatted as JSON and presented as a values of an object which key is the score identifier.
Whenever the request involves a conversion to a graphic instance of the score, options may be used to convey the layout settings. Similarly, options may be used to convert the score to a MIDI file.