[saint_yossarian]

The author mentions FoxESSCloud, which led me to https://www.foxesscloud.com/public/i18n/en/OpenApiDocument.h... with this Python example:

    signature = fr'{path}\r\n{token}\r\n{timestamp}'

So if this is indeed the API they're using it's not only literal "\\n" but also "\\r\\n", no "POST", and no body at the end.