public HttpRequestBuilder addHeader(String name, String value) {
    if (value != null) {
      reqHeaders.put(name, value);
    }
    return this;
  }
public HttpRequestBuilder addHeader ( String name , String value ) { if ( value != null ) { reqHeaders . put ( name , value ) ; } return this ; }
Add a header to the request. Note the content type will be set automatically
when providing the content payload and should not be set here. If the value
is null, then the header will get ignored.