title: How to get response from scrapy.Request without callback?
body: <p>I want to send a request and wait for a response from the server in order to perform action-dependent actions. I write the following</p>
  
  <pre><code>resp = yield scrapy.Request(*kwargs)
  </code></pre>
  
  <p>and got None in resp. In documentation I find that need to use call_back function, but this function call after processing next commands. How to wait response from server?</p>