405-Errors
405101: HTTP_METHOD_NOT_ALLOWED Client Error.
The request method is not supported by the following resource
404-Errors
404101: HTTP_NOT_FOUND Client Error. The requested resource could not be found.
Note: This is sometimes used to mask if there was an UNAUTHORIZED (401) or FORBIDDEN (403) error, for security reasons
403-Errors
403101: HTTP_FORBIDDEN Client Error.
The requested resource is unavailable at this present time
401-Errors
401101: HTTP_UNAUTHORIZED Client Error.
The user is unauthorized to access the requested resource