Yaml
GET /addonversions/8c1ef2ea-2d1f-497f-8e0d-e5b14f943395/yaml/?format=api
"spec: 0.1\r\ninstall:\r\n package: guzzlehttp/guzzle:v5.3.3\r\nmeta:\r\n name: composer/guzzlehttp/guzzle\r\n version: v5.3.3\r\n"GET /addonversions/8c1ef2ea-2d1f-497f-8e0d-e5b14f943395/yaml/?format=api
"spec: 0.1\r\ninstall:\r\n package: guzzlehttp/guzzle:v5.3.3\r\nmeta:\r\n name: composer/guzzlehttp/guzzle\r\n version: v5.3.3\r\n"