HTTP interaction against Boot2Docker to create Exec instance

example request

resp = conn.post('/exec/350/start', nil, :body => {}.to_json)
 => "\u0002\u0000\u0000\u0000\u0000\u0000\u0000,No such exec instance '350' found in daemon\n\u0001\u0000\u0000\u0000\u0000\u0000\u0000ZError starting exec command in container 350: No such exec instance '350' found in daemon\n"
 
resp = conn.post('/containers/known404/exec', nil, :body => {}.to_json)
Docker::Error::NotFoundError: Expected([200, 201, 202, 203, 204, 304]) <=> Actual(404 Not Found)

running #start twice fails with 200

2.1.2 :001 > require 'docker'
 => true
2.1.2 :002 > conn = Docker.connection
 => #<Docker::Connection:0x007fcd8614cc00 @url="tcp://192.168.59.103:2376", @options={:client_cert=>"/Users/tomduffield/.boot2docker/certs/boot2docker-vm/cert.pem", :client_key=>"/Users/tomduffield/.boot2docker/certs/boot2docker-vm/key.pem", :ssl_ca_file=>"/Users/tomduffield/.boot2docker/certs/boot2docker-vm/ca.pem", :scheme=>"https"}>
2.1.2 :003 > cid = '88fdc5e376422211cfa86e535992e81f678ccd4e8258c13275e83575ced778d3'
 => "88fdc5e376422211cfa86e535992e81f678ccd4e8258c13275e83575ced778d3"
2.1.2 :004 > resp = conn.post("/containers/#{cid}/exec", nil, :body => {'Cmd' => %w[date], 'Container' => cid}.to_json)
 => "{\"Id\":\"9a2db662cb5bbcb9226e4a7d2a08317f48a1dab849ebbab2d0fa25610240c70b\"}\n"
2.1.2 :005 > eid = '9a2db662cb5bbcb9226e4a7d2a08317f48a1dab849ebbab2d0fa25610240c70b'
 => "9a2db662cb5bbcb9226e4a7d2a08317f48a1dab849ebbab2d0fa25610240c70b"
2.1.2 :006 > resp = conn.post("/exec/#{eid}/start", nil, :body => {}.to_json)
 => ""
2.1.2 :007 > resp = conn.post("/containers/#{cid}/exec", nil, :body => {'Cmd' => %w[date],'AttachStdout' => true, 'Container' => cid}.to_json)
 => "{\"Id\":\"3392b81e327e340be075964a1543f4947aa0abca674cc5146dfa3993704feb6d\"}\n"
2.1.2 :008 > eid = '3392b81e327e340be075964a1543f4947aa0abca674cc5146dfa3993704feb6d'
 => "3392b81e327e340be075964a1543f4947aa0abca674cc5146dfa3993704feb6d"
2.1.2 :009 > resp = conn.post("/exec/#{eid}/start", nil, :body => {}.to_json)
 => "\u0001\u0000\u0000\u0000\u0000\u0000\u0000\u001DTue Nov 25 10:33:41 UTC 2014\n"
2.1.2 :010 > resp = conn.post("/exec/#{eid}/start", nil, :body => {}.to_json)
 => "\x02\x00\x00\x00\x00\x00\x00iNo such exec instance '3392b81e327e340be075964a1543f4947aa0abca674cc5146dfa3993704feb6d' found in daemon\n\x01\x00\x00\x00\x00\x00\x00\xD4Error starting exec command in container 3392b81e327e340be075964a1543f4947aa0abca674cc5146dfa3993704feb6d: No such exec instance '3392b81e327e340be075964a1543f4947aa0abca674cc5146dfa3993704feb6d' found in daemon\n"

vcr.yaml

---
http_interactions:
- request:
    method: post
    uri: https://192.168.59.103:2376/v1.15/exec/350/start
    body:
      encoding: UTF-8
      string: "{}"
    headers:
      User-Agent:
      - Swipely/Docker-API 1.15.0
      Content-Type:
      - application/json
  response:
    status:
      code: 200
      message: 
    headers:
      Content-Type:
      - application/vnd.docker.raw-stream
    body:
      encoding: UTF-8
      string: !binary |-
        AgAAAAAAACxObyBzdWNoIGV4ZWMgaW5zdGFuY2UgJzM1MCcgZm91bmQgaW4g
        ZGFlbW9uCgEAAAAAAABaRXJyb3Igc3RhcnRpbmcgZXhlYyBjb21tYW5kIGlu
        IGNvbnRhaW5lciAzNTA6IE5vIHN1Y2ggZXhlYyBpbnN0YW5jZSAnMzUwJyBm
        b3VuZCBpbiBkYWVtb24K
    http_version: 
  recorded_at: Tue, 25 Nov 2014 20:17:26 GMT
recorded_with: VCR 2.9.3