Flask render task doesn't works with gevent.

gistfile1.txt

import flask
import gevent

app = flask.Flask(__name__)

def task():
  print flask.render_template_string('Hello World!')

def with_context():
  with flask.current_app.test_request_context():
    print "with context: ",
    task()

def gevent_task():
  result = gevent.spawn(task)
  result.get()

def gevent_with_context():
  result = gevent.spawn(with_context)
  result.get()


if __name__ == "__main__":

  with app.app_context():
    # NOT WORKS
    #task()
    with_context()
    # NOT WORKS
    #gevent_task()
    gevent_with_context()