# Functions
ChooseIndex return valid index in [0, maxLen).
DebugJSON debug.
DebugSave write data to temperory file.
GetBody read body.
GetJSONBody read json body.
IsURL returns true if a given string is an url.
PostBody read post body.
RandString n is the length.
Scanline scan line.
ScanlineTrim scan line and trim.
YesOrNo must choose one.
# Constants
CHA map.