Retrieves the content of a variable by id. Applicable for byte array and file variables.
Basic authentication header of the form Basic <encoded-value>, where <encoded-value> is the base64-encoded string username:password.
The id of the variable instance.
Request successful. For binary variables or files without any MIME type information, a byte stream is returned. File variables with MIME type information are returned as the saved type. Additionally, for file variables the Content-Disposition header will be set.
For files without any MIME type information, a byte stream is returned.