Please tell me about the error list.

jojo.y

I could not figure out from this page (https://duet3d.dozuki.com/Wiki) under what circumstances I could get any errors.
If there is an error list, please let me know.
In particular, I would like to know the following pattern errors.

/rr_upload
/rr_status
/rr_gcode?gcode=M0
/rr_gcode?gcode=M23
/rr_gcode?gcode=M24
/rr_gcode?gcode=M25
/rr_gcode?gcode=M120
/rr_gcode?gcode=M121
/rrgcode=M999
/rr_gcode?gcode=G0
/rr_gcode?gcode=G28
/rr_gcode?gcode=G90
/rr_gcode?gcode=G91

jojo.y

I would especially like to know the error response when the status code is 500.