title: Can I make it mandatory to include at least one of two headers with Spring?
body: <p>One of my headers is misspelled, and I want to change it while being backwards compatible. </p>
  
  <pre class="lang-java prettyprint-override"><code>@RequestHeader(value = "Custmer-Key") String customerKey
  </code></pre>
  
  <p>I want to add a header with the correct spelling <code>Customer-Key</code>, and make at least one of them mandatory. Any ideas?</p>