The controller hierarchy of example APIs
![Controller Hierarchy Alt text](https://raw.githubusercontent.com/GwiYeong/versioning/master/images/controller-hierarchy.png?raw=true)
Versioning results of the A Controller
skim:versioning/ (master✗) $ curl localhost:8080/api/v1/a
a of v1
skim:versioning/ (master✗) $ curl localhost:8080/api/v2/a
a of v1
skim:versioning/ (master✗) $ curl localhost:8080/api/v3/a
a of v1 was overridden by v3
Versioning results of the B Controller
skim:versioning/ (master✗) $ curl localhost:8080/api/v1/b
b of v1
skim:versioning/ (master✗) $ curl localhost:8080/api/v2/b
b of v2
skim:versioning/ (master✗) $ curl localhost:8080/api/v3/b
b of v3
Versioning results of the C Controller
skim:versioning/ (master✗) $ curl localhost:8080/api/v1/c
c of v1
skim:versioning/ (master✗) $ curl localhost:8080/api/v2/c
c of v1
skim:versioning/ (master✗) $ curl localhost:8080/api/v3/c
c of v1
Invalid versions (BAD REQUEST)
skim:versioning/ (master✗) $ curl -I localhost:8080/api/v42/k
HTTP/1.1 400
Content-Language: en-US
Content-Length: 0
Date: Thu, 03 May 2018 08:10:14 GMT
Valid versions, but unimplemented APIs (NOT FOUND)
curl -I localhost:8080/api/v3/k
HTTP/1.1 404
Content-Language: en-US
Content-Length: 0
Date: Thu, 03 May 2018 08:09:55 GMT
skim:versioning/ (master✗) $ curl -I localhost:8080/api/some-faded-out-version/k
HTTP/1.1 410
Content-Language: en-US
Content-Length: 0
Date: Thu, 03 May 2018 08:09:25 GMT