title: django- how can i save data in redis with django with custom key?
body: <p>i want to delete some specific data after model.save() fired.
  i use "post_save()" signal.
  when I use cache_page() decorator in my views.py, data will save in redis with keys like this: "prefix:1:views.decorators.cache.cache_header..8ce4de6051c3ba05396ff670741d3172.fa-ir.IRST'.</p>
  
  <p>I want to save data with custom key that i specify.
  how can i do it?</p>
  
  <p>or</p>
  
  <p>how can i delete stored data that are related to specific url ?</p>
  
  <pre><code>url1: a/1/b/
  url2: a/2/b/
  </code></pre>
  
  <p>how can i get data that are saved for url1?</p>