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Predicate status_number/2
 status_number(+Status:atom, -Code:nonneg) is det[private]
status_number(-Status:atom, +Code:nonneg) is det[private]
Relates a symbolic HTTP status names to their integer Code. Each code also needs a rule for status_comment//1.
- type_error If Code is instantiated with something other than an integer.
- domain_error If Code is instantiated with an integer outside of the range [100-599] of defined HTTP status codes.