Cannot configure Http-Connector headers using element templates

The Map type is required to configure headers in HTTP connectors (cf. this example):

<camunda:connector>
  <camunda:connectorId>http-connector</camunda:connectorId>
  <camunda:inputOutput>

    <camunda:inputParameter name="url">
      http://feiertage.jarmedia.de/api/?jahr=2014&amp;nur_land=BE
    </camunda:inputParameter>

    <camunda:inputParameter name="method">
      GET
    </camunda:inputParameter>

    <camunda:inputParameter name="headers">
      <map>
        <entry key="Accept">
          application/json
        </entry>
      </map>
    </camunda:inputParameter>

    <camunda:outputParameter name="isHoliday">
      <camunda:script scriptFormat="Javascript" resource="parseHoliday.js" />
    </camunda:outputParameter>
  </camunda:inputOutput>
</camunda:connector>

Since element templates are not supporting Map as an input type we cannot create headers for http-connector. For example:

{
            "label": "headers",
	    "type": "Hidden",
            "editable": false,
            "value": {
		 "Content-Type" : "application/json"
	    },
            "binding": {
              "type": "camunda:inputParameter",
              "name": "headers"
            }
          }

or this

{
            "label": "headers",
	    "type": "Hidden",
            "editable": false,
            "value": "{'Content-Type':'application/json'}'",
            "binding": {
              "type": "camunda:inputParameter",
              "name": "headers"
            }
          }

is not working. Because of this i thing that element templates for connectors are useless in this form without support for Map.

[adrianriepl]

You can actually do Script & Script Format:

Here an example for the input parameter payload for the http-connector:

{
   "label": "Payload",
   "type": "Text",
   "value": "var requestBody = {\n \"to\": execution.getVariable(\"to\"),\n \"body\": execution.getVariable(\"body\"),\n \"subject\": execution.getVariable(\"subject\")\n}; \n\nJSON.stringify(requestBody);",
   "binding": {
      "type": "camunda:inputParameter",
      "name": "payload",
      "source": "var requestBody = {\n \"to\": execution.getVariable(\"to\"),\n \"body\": execution.getVariable(\"body\"),\n \"subject\": execution.getVariable(\"subject\")\n}; \n\nJSON.stringify(requestBody);",
      "scriptFormat": "JavaScript"
   }
}

Or here the example from the samples for an output parameter as script:

{
   "label": "Response",
   "type": "String",
   "value": "wsResponse",
   "binding": {
      "type": "camunda:outputParameter",
      "source": "${S(response)}",
      "scriptFormat": "freemarker"
   }
}

[philcolbourn]

I hoped to hack this by using scopes inside a scope somehow…

I also tries adding <camunda:map><camunda:entry key='Accept'>application/json</camunda:entry></camunda:map> to headers value

no good.