title: Amazon Product Advertising API: Get Average Customer Rating
body: <p>When using Amazon's web service to get any product's information, is there a direct way to get the Average Customer Rating (1-5 stars)?  Here are the parameters I'm using:</p>
  
  <pre><code>Service=AWSECommerceService
  Version=2011-08-01
  Operation=ItemSearch
  SearchIndex=Books
  Title=A Game of Thrones
  ResponseGroup=Large
  </code></pre>
  
  <p>I would expect it to have a customer rating of 4.5 and total reviews of 2177.  But instead I get the following in the response.</p>
  
  <pre><code>&lt;CustomerReviews&gt;&lt;IFrameURL&gt;http://www.amazon.com/reviews/iframe?...&lt;/IFrameURL&gt;&lt;/CustomerReviews&gt;
  </code></pre>
  
  <p>Is there a way to get the overall customer rating, besides for <a href="http://docs.amazonwebservices.com/AWSECommerceService/2011-08-01/DG/RG_Reviews.html">reading the <code>&lt;IFrameURL/&gt;</code> value</a>, making another HTTP request for that page of reviews, and then screen scraping the HTML?  That approach is fragile since Amazon could easily change the reviews page structure which would bust my application.</p>