code: public void setExposeHeaders(java.util.Collection<String> exposeHeaders) {
          if (exposeHeaders == null) {
              this.exposeHeaders = null;
              return;
          }
  
          this.exposeHeaders = new java.util.ArrayList<String>(exposeHeaders);
      }
docs: <p>
  One or more headers in the response that you want users to be able to access from their applications (for
  example, from a JavaScript <code>XMLHttpRequest</code> object).
  </p>
  <p>
  This element is optional for each rule.
  </p>
  
  @param exposeHeaders
  One or more headers in the response that you want users to be able to access from their applications (for
  example, from a JavaScript <code>XMLHttpRequest</code> object).</p>
  <p>
  This element is optional for each rule.