The first digit of the number indicates the status category of
response code. There are five categories in total.
1xx Informational: There are only a few codes here, and they essentially mean that
the request was received and the process will continue.
2xx Success: These indicate that whatever action was requested has been successfully
received and processed.
3xx Redirection: This series covers web page redirection.
4xx Client Error: This category is home to several common codes, usually generated
from missing or forbidden content.
5xx Server Error: These occur when something goes awry on the server. They usually
appear when server-side code (Perl, PHP, ASP, and others) is not functioning.
CONTINGENCY PLANNING
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All told, there are nearly 60 standard codes that are tracked by servers.1 Some codes
remain unused (such as 402, which was intended for micropayments, but has yet to see
the light of day); others are being drafted (like 509, which indicates bandwidth limits have
been exceeded), while others like 404 and 500, are as common as seashells on a beach.
These more prevalent errors, covered in depth in the following subsections, require contingency
planning.
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