Can Postman or Chrome display REST streaming output?

Question

I have a REST server that is supposed to send plain text output as a stream, but when I perform the REST call with Postman or Chrome I get the whole output at once at the end of the process instead of getting a stream.

Here is my REST server, inspired from this article:

@GET
@Path("/stream-test")
@Produces(MediaType.TEXT_PLAIN)
public Response streamTest(){
  StreamingOutput stream = new StreamingOutput() {
    @Override
    public void write(OutputStream os) throws IOException, WebApplicationException {
      Writer writer = new BufferedWriter(new OutputStreamWriter(os));
      for (int i=1; i<=10; i++) {
        writer.write("output " + i + " \n");
        try {
          Thread.sleep(500);
        } catch (InterruptedException e) {
          e.printStackTrace();
        }
      }
      writer.flush();
    }
  };
  return Response.ok(stream).build();
}

The output lines are all displayed at the same time. I would like to see an output each 500msec.

Is there something wrong with my implementation ?

Or are Postman and Chrome unable to display streaming outputs ?

Note: for technical reasons I still use Postman as a Chrome app.

Answer 1

This post is quite recent; https://community.getpostman.com/t/stream-services-listener-how-to-test-in-postman/9714

Postman doesn't support streaming api's at the moment!

But as they've stated you can watch the issue on GitHub for updates ; https://github.com/postmanlabs/postman-app-support/issues/5040

Answer 2

Getting the CURL request from POSTMAN is not enough in case you are streaming. In my case, needed to append the option

--no-buffer

and worked fine