The digits in the response code can be used to determine status
programatically.
First Digit (status):
1xx = a positive, but preliminary, reply
2xx = a positive reply indicating completion
3xx = a positive reply indicating incomplete status
4xx = a temporary negative reply
5xx = a permanent negative reply
Second Digit (subject):
x0x = condition based on syntax
x1x = informational
x2x = connection
x3x = authentication/process
x5x = file system
The response code.
The digits in the response code can be used to determine status programatically.
First Digit (status): 1xx = a positive, but preliminary, reply 2xx = a positive reply indicating completion 3xx = a positive reply indicating incomplete status 4xx = a temporary negative reply 5xx = a permanent negative reply
Second Digit (subject): x0x = condition based on syntax x1x = informational x2x = connection x3x = authentication/process x5x = file system