Redirecting From Within Helper Functions - Flask

15 Nov 2014

	from flask import Flask, redirect
	from werkzeug.routing import RoutingException, HTTPException
	app = Flask(__name__)
	@app.route('/')
	def hello_world():
	def helper_function():
	# Attempt #1
	# this obviously won't work: return redirect('www.google.com')
	# the program would just return 'Hello World!'
	# Attempt #2
	# THIS IS PERMANENT!: raise RequestRedirect('example2')
	# your browser will cache the status 301 and ALWAYS redirect
	# explanation: http://stackoverflow.com/a/16371787/1364191
	# Attempt #3
	class RequestRedirect(HTTPException, RoutingException):
	"""Raise if the map requests a redirect. This is for example the case if
	`strict_slashes` are activated and an url that requires a trailing slash.
	The attribute `new_url` contains the absolute destination url.
	The attribute `code` is returned status code.
	"""
	def __init__(self, new_url, code=301):
	RoutingException.__init__(self, new_url)
	self.new_url = new_url
	self.code = code
	def get_response(self, environ):
	return redirect(self.new_url, self.code)
	raise RequestRedirect('example3', code=302)
	helper_function()
	return 'Hello World!'
	@app.route('/example2')
	def example2():
	return 'Example 2'
	@app.route('/example3')
	def example3():
	return 'Example 3'
	if __name__ == '__main__':
	app.run(host="0.0.0.0", port=9999, debug=True)

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