title: What do the chars %7D mean in an url query?
body: <p>If I access my webapp with the url</p>
  
  <p><code>/vi/5907399890173952.html</code></p>
  
  <p>then it works but when I look in the log files then googlebot is trying to access a similar url which generates an exception:</p>
  
  <p><code>/vi/5907399890173952.html%7D%7D</code></p>
  
  <p>what does it mean and how can it be handled as an exception? The message from python is:</p>
  
  <pre><code> /vi/5251302833520640.html%7D%7D 404 20ms 0kb Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) module=default version=release140319
  66.249.67.109 - - [19/Mar/2014:07:53:32 -0700] "GET /vi/5251302833520640.html%7D%7D HTTP/1.1" 404 84 - "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" ms=21 cpu_ms=0 cpm_usd=0.000009 app_engine_release=1.9.1 instance=00c61b117c0bc0f980f2a37a6ac534786055d3ab
  E 2014-03-19 15:53:32.678
  get() takes exactly 3 arguments (2 given)
  </code></pre>
  
  <p>The regex that I use for the url is</p>
  
  <p><code>('/vi/(\d+)(\.html?)?', NewHandler)</code></p>
  
  <h2>Update 140319 21:54 CET</h2>
  
  <p>I think I've found the leakage from a jinja2 template:</p>
  
  <p><code>{{scored_document.fields.0.value|safe}</code></p>
  
  <p>I patched it with another <code>}</code> now. </p>