The Mapping Definitions section on the REST Expose Editor allows you to add, modify, or delete the custom node entries added to an element of a HTTP request or response.
Note: The option of adding a node is available for only for HTTP Header and it's children.

To add a node:

  1. Select an element of a HTTP request or response.
  2. Right-click the element, and then select Add node on the right-click context menu.
    The Add Node dialog appears.
  3. From the Type down-down, specify an element type for which you want to create the node such as Query String Parameter, Header, Body, or Cookie. If you select a PUT or POST verb on the Verb Association section, the Type drop-down will also include the Form Parameter type.
    Note:

    For a HTTP response, you can see only Header, Body, and Cookie in the Type drop-down.

    If you selected Header as Type, you can select content-type as the Header name from the drop-down list.

  4. In the Query String Parameter, Form Parameter, Header, or Cookie field, specify a value for the selected element. For example, Query1 for Query String Parameter. The Expression value field displays the specified parameter value. For example, ${rest.queryparam['Query1']}.

    The following example illustrates how to specify the Cookie field (a CHAR or LONGCHAR type). After choosing the Cookie field from the drop-down list, you set the cookie (as per the HTTP cookie standard) as follows:

    Set-Cookie: HSID=AYQEVn.DKrdst; Domain=.foo.com; Path=/; Expires=Wed, 13-Jan-2021 22:23:01 GMT; HttpOnly

    Set-Cookie is a directive for the browsers to store the cookie. The Expression value field displays the following parameter value: ${rest.cookie['Set-Cookie: HSID=AYQEVn.DKrdst; Domain=.foo.com; Path=/; Expires=Wed, 13-Jan-2021 22:23:01 GMT; HttpOnly']}.

    For more information on HTTP cookie specifications and setting a HTTP cookie, see the online information sources.

    Note: The field does not allow Java reserved words such as INT, CHAR, and BOOLEAN to be used as parameter names.
  5. From the Name drop-down list in the Body type, select a parameter. This list displays the input and output parameters of the operation (ABL routine) that is associated with the REST resource verb.
    Note: The Name and JSON type fields appear when you specify the node type as Body in the Type drop-down.
  6. From the JSON type drop-down, select a data type. This list displays the OpenEdge supported JSON data types.
    Note: The JSON type drop-down will be enabled only when you specify your own parameter instead of selecting one of the parameters listed in the drop-down.
You can see the added node entry under the selected HTTP request or response element. The defined node context menu provides the options to edit (Edit node) or delete (Delete) the node.