title: Nginx proxy_no_cache and proxy_cache_bypass
body: <p>Here's the documentation:</p>
  <blockquote>
  <p><strong>proxy_cache_bypass</strong><br />
  Defines conditions under which the response will not be taken from a cache. If at least one value of the string parameters is not empty and is not equal to “0” then the response will not be taken from the cache:<br />
  <code>proxy_cache_bypass $cookie_nocache $arg_nocache$arg_comment;</code><br />
  <code>proxy_cache_bypass $http_pragma    $http_authorization;</code><br />
  Can be used along with the proxy_no_cache directive.</p>
  <p><strong>proxy_no_cache</strong><br />
  Defines conditions under which the response will not be saved to a cache. If at least one value of the string parameters is not empty and is not equal to “0” then the response will not be saved:<br />
  <code>proxy_no_cache $cookie_nocache $arg_nocache$arg_comment;</code><br />
  <code>proxy_no_cache $http_pragma    $http_authorization;</code><br />
  Can be used along with the proxy_cache_bypass directive.</p>
  </blockquote>
  <p>Does that mean if I want to totally exclude something in cache, I should set both <code>proxy_no_cache</code> and <code>proxy_cache_bypass</code>? Is it OK if I only set <code>proxy_cache_bypass</code>?</p>