In this endpoint you will get canvas as raw binary bytes with each byte representing a color. There is 256 color and you can get the list of colors with https://locahost:8000/colors request.

Get list of all the 256 colors available

Response:

[
  "#000000",
  "#800000",
  "#008000",
  ...
]

Set color to a cell

Request:

{
    "width": 0,
    "height": 0,
    "color": 12
}

Note: Color field is the index of color in the colors array received from server.

You can use hexdump and curl to check output:

curl localhost:8000/ --output - --silent | hexdump