title: Able to access url even after closing IDE
body: <p>Developing a simple application in Flask. I am able to access my URL even after I close the IDE(PyCharm). Also, I think because my previous code is continuously running on the port, my latest code changes are not being reflected.
  My host is 0.0.0.0 and port is 5000.</p>
  
  <pre><code>from cs50.sql import SQL
  from flask import Flask, redirect, request, url_for, render_template
  
  app = Flask(__name__)
  db = SQL("sqlite:///test.db")
  
  @app.route("/login", methods = ["GET"])
  def index():
      return render_template("index.html")
  
  @app.route("/register", methods = ["POST"])
  def register():
      if request.form["name"] == "" or request.form["dorm"] == "":
          return render_template("failure.html")
      rows = db.execute("INSERT INTO students (name, dorm) VALUES(:name, :dorm)", name = request.form["name"], dorm = request.form["dorm"])
      return render_template("success.html", registrant = rows)
  
  @app.route("/all", methods = ["GET"])
  def seeAllUsers():
      rows = db.execute("SELECT * FROM students")
      return render_template("all_users.html", rows = rows)
  if __name__ == "__main__":
      app.run(host="0.0.0.0")
  </code></pre>
  
  <p>localhost:5000/login is always online. Other 'GET' URLs are not.</p>