Easiest way to implement HTTP server that can send ROS messages

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I have a web interface that sends http requests to a server. When this server receives a request it needs to send messages through a ROS topic. Since this server will be very simple I thought that the easiest way would be to use Flask to make a REST service, but ROS doesn't seem to play nice with Flask. This is the code I am trying to execute:

#!/usr/bin/env python

## RESTful server that controls robot arm

import rospy
from std_msgs.msg import String
from flask import Flask, jsonify, request, abort

app = Flask(__name__)
topic='mytopic'

def talker():
    rospy.loginfo('Starting talker')
    pub = rospy.Publisher(topic, String, queue_size=10)
    rospy.init_node('talker', anonymous=True)
    rospy.loginfo('Talker started')

@App.route('/actions/execute', methods=['GET'])
def get_execute():
    action = request.args.get('action')
    if not action:
        abort(400)
    return action

if __name__ == '__main__':
    talker()
    rospy.loginfo("Starting Flask server")
    app.run(debug=True)

If I comment out the line that calls talker() in main, the server starts correctly. If I execute it as shown however, I get the following:

[INFO] [WallTime: 1463411613.101553] Talker started
[INFO] [WallTime: 1463411613.102112] Starting Flask server
[INFO] [WallTime: 1463411613.576470] Talker started
[INFO] [WallTime: 1463411613.576941] Starting Flask server

And the Flask server never starts. I also can't kill the process with ctrl-c. Is there a way to make ROS work with Flask? And if there isn't, what is the easiest way to accomplish what I'm trying?