Modeling Guide

Response Invoker

The util.responseinvoker can be used to invoke the response callback to dliver a response message to the initiator of a request response invocation. This examples shows how this operator can be used with openapi.server and a custom operator to deliver the response to the http request.

Configure and Run the Graph

Follow the steps below to run the example from the Data Pipeline UI:
  1. Start the graph. This demo service will be started at path /openapi/service/samples/respinvoke relative to the vflow instance URL.
  2. Open the UI from the wiretap operator so that the request messages are displayed on the browser.
  3. From some REST client, send a POST request to /openapi/service/samples/respintercept2/echo with some text content. This service will echo the reversed text. When using curl, this would correspond to: 
    curl -i -X POST -d 'some text' http://{host}:{port}/{path}/openapi/service/samples/respinvoke/echo
    For example, for a local vflow instance, use http://localhost:8090/ as in
    $ curl -i -X POST -d 'buenos dias' 'http://localhost:8090/openapi/service/samples/respinvoke/echo'
HTTP/1.1 200 OK
Access-Control-Allow-Headers: accept, content-type, authorization
Access-Control-Allow-Methods: POST, GET, OPTIONS, PUT, DELETE
Access-Control-Allow-Origin: http://localhost:8090
Content-Type: text/plain
Date: Wed, 11 Apr 2018 18:16:22 GMT
Content-Length: 11

said soneub
  4. Send another POST request with the wrong path to trigger an error (Note: the javascript operator returns an error if the request path is not /samples/respintercept2/echo).
    $ curl -i -X POST -d 'buenos dias' 'http://localhost:8090/openapi/service/samples/respinvoke/bad'
HTTP/1.1 500 Internal Server Error
Access-Control-Allow-Headers: accept, content-type, authorization
Access-Control-Allow-Methods: POST, GET, OPTIONS, PUT, DELETE
Access-Control-Allow-Origin: http://localhost:8090
Content-Type: text/plain; charset=utf-8
X-Content-Type-Options: nosniff
Date: Wed, 11 Apr 2018 18:17:19 GMT
Content-Length: 81

Invalid path /samples/respinvoke/bad; Expect path /samples/respinvoke/echo
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