code: @Override
      public void removeRequestHeader(String headerName) {
          
          Header[] headers = getRequestHeaderGroup().getHeaders(headerName);
          for (int i = 0; i < headers.length; i++) {
              getRequestHeaderGroup().removeHeader(headers[i]);
          }
          
      }
docs: Remove the request header associated with the given name. Note that
  header-name matching is case insensitive.
  
  @param headerName the header name