Make it easier to see the HTTP headers when debugging MockMvc-based tests [SPR-15375]

[spring-projects-issues]

Andy Wilkinson opened SPR-15375 and commented

It would make debugging of MockMvc-based tests easier if HeaderValueHolder implemented toString(). As things stand, when looking at the headers of a MockHttpServletRequest I can see this:

{Accept=org.springframework.mock.web.HeaderValueHolder@3bc20984}

To get the actual value(s) of the header I have to drill down into the specific entry of the underlying LinkedHashMap.

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No further details from SPR-15375