New methods in DefaultResponseCreator for adding headers and cookies,
for specifying the character encoding when setting a string body on
a response, which is useful when working in environments that do not
automatically assume UTF-8, such as integrating with legacy
applications from a new Spring one.
New methods in MockRestResponseCreators support extra commonly used
HTTP status codes, including some that occur when working in AWS,
CloudFlare, or when using gateways such as Kong, where resilient
applications should be able to respond to ratelimits, gateway errors,
and gateway timeouts that may occur if a remote service is down.
Added test cases for any changes made.
See gh-27280
d14477eb84