title: Is passing a query string parameter (whose value is null) without the equals sign valid?
body: <p>Variation 1:</p>
  
  <pre><code> file.jsp?parameter1=&amp;parameter2=abc
  </code></pre>
  
  <p>Variation 2:</p>
  
  <pre><code> file.jsp?parameter1&amp;parameter2=abc
  </code></pre>
  
  <p>I know Variation 1 is considered valid, but is variation 2 considered valid?  Specifically, there is no value for the parameter, is the equals sign required in this case?</p>