title: How to avoid duplicated data cache on range query?
body: <p>everyone. <br/>
  Our rest API supported a ranged resource query like this: <code>/api/v1/examples?offset=0&amp;limit=100</code>.<br/>
  We cached every query on memcached to improve performance. But, two query may have duplicated data range. </p>
  
  <p>For example:<br/>
  <code>/api/v1/examples?offset=0&amp;limit=100</code><br/>
  <code>/api/v1/examples?offset=1&amp;limit=101</code><br/></p>
  
  <p>Data in range 2~100 will be cached twice!!<br/>
  Is there any method to avoid this?</p>