How to iteratively pass a header parameter in to a API url to get the complete list from the API.

It will look something like:

let
    NextResult = (token) =>
        let
            URL = "https://vsrm.dev.azure.com/fe-tfs/Advisory%20products/_apis/release/releases?api-version=5.1",
            URLWithContinuation = 
                if token = null then
                    URL
                else
                    URL & "&continuationToken=" & token, 
            Content = VSTS.Contents(URLWithContinuation),
            AsJson = Json.Document(Content)[value],
            continuationToken = Value.Metadata(Content)[Headers][#"x-ms-continuationtoken"]?,
            Result = 
                if continuationToken = null then
                    AsJson
                else
                    AsJson & @NextResult(continuationToken)
        in
            Result,
    AsTable = Table.FromRecords(NextResult(null))
in
    AsTable