capture/noworkflow/jupyter/extension.js
function(value) {
      if (!arguments.length) return mimeType;
      mimeType = value == null ? null : value + "";
      return request;
    }
function(value) {
      if (!arguments.length) return mimeType;
      mimeType = value == null ? null : value + "";
      return request;
    }
function ( value ) { if ( ! arguments . length ) return mimeType ; mimeType = value == null ? null : value + "" ; return request ; }
If mimeType is non-null and no Accept header is set, a default is used.
If mimeType is non - null and no Accept header is set a default is used .