Adds methods to configure validation of header names and values and
parameter names and values:
* setAllowedHeaderNames(Predicate)
* setAllowedHeaderValues(Predicate)
* setAllowedParameterNames(Predicate)
* setAllowedParameterValues(Predicate)
By default, header names, header values, and parameter names that
contain ISO control characters or unassigned unicode characters are
rejected. No parameter value validation is performed by default.
Issue gh-8644