title: API Key and RESTKit
body: <p>I'm using <a href="http://restkit.org/" rel="nofollow"><strong>RESTKit</strong></a> for a service that was created for me. The model in JSON for my user is:</p>
  
  <pre><code>{
      "api_key" : "123456"
      "user" : {
          "username" : "user1",
          "email"    : "me@email.com",
          "name"     : "name1",
          "surname"  : "surname1"
      }
  }
  </code></pre>
  
  <p>I need introduce the <code>api_key</code> if I want to GET an user <code>/users/1.json</code>. I read in the documentation about set an app-wide API key HTTP header. </p>
  
  <p>The example is:</p>
  
  <pre><code>[client setValue:@"123456" forHTTPHeaderField:@"X-RESTKIT-API-KEY"];
  </code></pre>
  
  <p>Is it the right way to do this? How can I discover my <code>@"X-RESTKIT-API-KEY"</code> of my service? (not api_key value, I search the string to replace <code>@"X-RESTKIT-API-KEY"</code> for my service)</p>