/// <summary>
 /// Test explicitly optional integer. Please put a header 'headerParameter'
 /// =&gt; null.
 /// </summary>
 /// <param name='operations'>
 /// The operations group for this extension method.
 /// </param>
 /// <param name='headerParameter'>
 /// </param>
 public static void PostOptionalArrayHeader(this IExplicitModel operations, IList <string> headerParameter = default(IList <string>))
 {
     operations.PostOptionalArrayHeaderAsync(headerParameter).GetAwaiter().GetResult();
 }