title: Flask : href link to html not working
body: <p>I have a basic Flask app with the following structure :</p>
  
  <pre><code>from flask import Flask
  from flask import render_template
  app = Flask(__name__,template_folder='E:\Programming\Python Projects\Flask')
  
  @app.route('/')
  def index():
      return render_template('hello.html')
  @app.route('/route/')
  def route1():
      return render_template('route1.html')
  app.run(debug = True,port = 8080,host = '0.0.0.0')
  </code></pre>
  
  <p>hello.html : </p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head&gt;
      &lt;title&gt;Rendered!!&lt;/title&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;h1&gt;
      The template has been rendered!!!&lt;br&gt;
      &lt;a href="localhost:8080/route"&gt;Route No. 1&lt;/a&gt;
  &lt;/h1&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>route1.html :</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head&gt;
      &lt;title&gt;Route No. 1&lt;/title&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;h2&gt;
      This is the first route!!!&lt;br&gt;
      Hello World!!!
  &lt;/h2&gt;
  &lt;iframe src="https://www.youtube.com/embed/YQHsXMglC9A" width="853" height="480" frameborder="0" allowfullscreen&gt;&lt;/iframe&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>When I open <code>localhost:8080</code> it works fine.
  But when I click on the link, it says : </p>
  
  <pre><code>The address wasn’t understood
  Firefox doesn’t know how to open this address, because one of the following protocols (localhost) isn’t associated with any program or is not allowed in this context.
  </code></pre>
  
  <p>It works fine when I type the address <code>localhost:8080/route</code> manually in the address bar.
  Also, it works fine when opened in a new tab.
  I need help!!!
  Thank You !!!</p>