/// <summary>
 /// Test explicitly required string. Please put a header 'headerParameter'
 /// =&gt; null and the client library should throw before the request is sent.
 /// </summary>
 /// <param name='operations'>
 /// The operations group for this extension method.
 /// </param>
 /// <param name='headerParameter'>
 /// </param>
 public static Error PostRequiredStringHeader(this IExplicitModel operations, string headerParameter)
 {
     return(operations.PostRequiredStringHeaderAsync(headerParameter).GetAwaiter().GetResult());
 }