public static Header exists(final String name)
   {
      return new Header(name, "{" + Header.class.getName() + "_value}") {
         @Override
         public String toString()
         {
            return "Header.exists(\"" + name + "\")";
         }
      };
   }
public static Header exists(final String name)
   {
      return new Header(name, "{" + Header.class.getName() + "_value}") {
         @Override
         public String toString()
         {
            return "Header.exists(\"" + name + "\")";
         }
      };
   }
public static Header exists ( final String name ) { return new Header ( name , "{" + Header . class . getName ( ) + "_value}" ) { @ Override public String toString ( ) { return "Header.exists(\"" + name + "\")" ; } } ; }
Create a {@link Header} condition that matches only against the existence of a header with a name matching the
given pattern. The header value is ignored.
<p>
The given name pattern may be parameterized:
<p>
<code>
Header.exists("Accept-Encoding")<br>
Header.exists("Accept-{acceptType}")<br>
Header.exists("{anything}")<br>
...
</code>
<p>

@see {@link ConfigurationRuleParameterBuilder#where(String) {@link HttpServletRequest#getHeader(String)}

@param name {@link ParameterizedPattern} matching the header name.
Create a { @link Header } condition that matches only against the existence of a header with a name matching the given pattern . The header value is ignored . <p > The given name pattern may be parameterized : <p > <code > Header . exists ( Accept - Encoding ) <br > Header . exists ( Accept - { acceptType } ) <br > Header . exists ( { anything } ) <br > ... < / code > <p >