Affects: 5.3.21

The current API for MockRestServiceServer and MockRestRequestMatchers does not allow a test to validate that all values of a certain header key satisfy a matcher. Trying to do

.andExpect(header("Accept", endsWith("json")))

does not work because it passes if the first value for the header ends with "json". I would like to be able to do something like this:

.andExpect(header("Accept", allMatch(endsWith("json"))))

or something to that effect.