The "/images/create" request is a POST request but nothing is actually being posted. Either change the query parameters into JSON post payload for or change the request type to a GET request.

The first chunk of the response contains a status JSON data that ends with "\r\n" but subsequent chunks don't end with a new line character therefore making difficult to parse the response. Bellow is the raw response I am seeing:

{"status":"Pulling repository base"}\r\n
{"status":"Pulling image (ubuntu-quantl) from base","progressDetail":{},"id":"b750fe79269d"}{"status":"Pulling image (ubuntu-quantl) from base, endpoint: https://cdn-registry-1.docker.io/v1/","progressDetail":{},"id":"b750fe79269d"}{"status":"Pulling dependent layers","progressDetail":{},"id":"b750fe79269d"}{"status":"Download complete","progressDetail":{},"id":"27cf78414709"}{"status":"Download complete","progressDetail":{},"id":"b750fe79269d"}{"status":"Download complete","progressDetail":{},"id":"b750fe79269d"}

The "/images/create" response property names don't conform to the general pascal casing used by Docker Remote API. Change response to conform to this casing:

{"Status":"Pulling blah", "Error": "blah", "ProgressDetail": "blah" }

The "/images/create" is a blocking operation that could take some time. Instead of blocking you should utilize command/query pattern for the request. The create image request should return a token/id for the request and allow the user to query the status of the request. Break the API down to:

Request:  "/images/create"
Response: "{"Status": "Creating Image ....", "Id": "abc", "Error": [true|false]}"

Request: "/images/create/status?Id=abc
Response: "[
  {"Status": "Creating Image ....", "Id": "abc", "Error": [true|false]}
]"