JSON response should have `content-type` = `application/json`

[skyline75489]

https://github.com/sparrowzoo/sparrow-shell/blob/aeafb5afe77b4c5316915ce61b8bf1e40aeff4de/sparrow-test/src/main/java/com.sparrow/controller/HelloController.java#L69

This now returns text/html which is not expected.

[sparrowzoo]

auto support content-type = application/json

https://github.com/sparrowzoo/sparrow-shell/blob/master/sparrow-mvc/src/main/java/com/sparrow/mvc/result/impl/JsonMethodReturnValueResolverHandlerImpl.java

[skyline75489]

Interesting. I see different result:

http://www.sparrowzoo.com/json-test.json

[skyline75489]

Full payload:

[sparrowzoo]

done