-- ver: |...Default.Backend............|    0.1
-- ver: |...404.Not.Found.-.Error.Page.|    0.2

-- ver: |1.1|...|...||blue.|.....|.....|
-- ver: |...|1.2|...||blue.|.....|.....|
-- ver: |...|...|1.3||blue.|.....|.....|

-- ver: |2.1|...|...||.....|green|.....|
-- ver: |...|2.2|...||.....|green|.....|
-- ver: |...|...|2.3||.....|green|.....|

-- ver: |3.1|...|...||.....|.....|red..|
-- ver: |...|3.2|...||.....|.....|red..|
-- ver: |...|...|3.3||.....|.....|red..|

docker run -d --rm -p 8080:80 therafk/httpd:1.1
while true; do curl -s localhost:8081 | grep "ver:" ; sleep 1; done