text: ##flask app
  
  from flask import Flask, url_for
  app = Flask(__name__)  #name of the app
  
  ## absolute urls
  @app.route('/')
  def hello_world():
      return 'Hello, World!'
  
  @app.route('/1')
  def hello_world1():
      return 'Hello, World1!'
  
  @app.route('/2')
  def hello_world2():
      return 'Hello, World2!'
  
  ##adding meaningful routes and variables with flask
  ## sting
  @app.route('/hello/<user>')
  def hello_user(user):
      return 'Hello %s' %user
  
  ## int
  @app.route('/hello/<user>/<int:id>')
  def hello_user_id(user,id):
      retStr="Hello {} with Id:{}".format(user,id)
      return retStr
  
  ## path
  @app.route('/hello/<path:subpath>')
  def hello_user_path(subpath):
      return 'Hello %s' %subpath
  
  ##redirection add a slash at the end
  @app.route('/projects/')
  def projects():
      return 'The project page'
  
  ###Using url_function to build urls for a specific function
  
  with app.test_request_context():
      print(url_for('hello_world'))
      print(url_for('hello_user_id',user='dvd',id=1))
  #url_for('static', filename='style.css')
  #The file has to be stored on the filesystem as static/style.css.
  
  ##HTTP, import request, and use request.
  
  