How to use json command to read ATTITUDE_QUATERNION on Web Browser?

Dear all,

I would like to read ATTITUDE_QUATERNION with MavLink commands using APSYNC.

I am reading the following manuar.

I would like to use the sample in this.
http://192.168.99.1/ajax/command.json?command1=mavlink_message_send(PARAM_SET,0,0,SCHED_DEBUG,0)

Should I change this to the following?
http://192.168.99.1/ajax/command.json?command1=mavlink_message_send(MAV_CMD_SET_MESSAGE_INTERVAL,ATTITUDE_QUATERNION,100000,0)

And then read it out as follows?
http://192.168.99.1/ajax/command.json?command1=mavlink_message(ATTITUDE_QUATERNION)

Thank you.