openfunction

openfunction

Forwards the request to an OpenFunction endpoint and returns the function's status, headers, and body as the gateway response. It replaces the upstream: place it where an upstream node would go and wire its success port straight to client.in.

Configuration

Key	Type	Default	Description
function_uri	string	required	OpenFunction URL to invoke.
authorization	object	—	Optional service-token credential (see below).
authorization.service_token	string	—	Sent as Authorization: Basic <base64(service_token)>.
ssl_verify	bool	true	Verify TLS certificates on the callout.
timeout	integer (ms)	3000	Whole-call deadline (connect + request + response body).

type: openfunction
config:
  function_uri: http://openfunction.svc/default/hello
  authorization:
    service_token: ${OPENFUNCTION_TOKEN}
  ssl_verify: true
  timeout: 3000

Config load fails if function_uri is missing or empty.

Behavior

The plugin forwards the client's method, headers, query string, and body to function_uri, overriding Host with the endpoint's authority. When authorization.service_token is set, an Authorization: Basic <base64(service_token)> header is added (replacing any client-supplied Authorization). On success it populates context.response with the function's status, headers, and body and exits through the success port — which should be wired to client.in, since this node stands in for the upstream. The function's status is passed through as-is.

A callout failure returns the Context along with an error so the graph engine routes through the error port; the error is appended to context.errors — see Errors.

The plugin does not read or write context.message.

Errors

The node returns the Context with an error, so the graph engine routes through the error port and appends the error to context.errors. The status below is the one prepared on context.response; wire error to client (or an error-handler) for the caller to see it.

Code	Status	When
OPENFUNCTION_CALLOUT_ERROR	504	The function callout exceeded timeout.
OPENFUNCTION_CALLOUT_ERROR	503	Connecting to or exchanging with the endpoint failed.
OPENFUNCTION_CALLOUT_ERROR	502	The request could not be built (e.g. an invalid endpoint URI).