DartHtmlHttpHandler should have a const constructor.
DartHtmlHttpHandler should have a const constructor.

google/streamy-dart,srawlins/streamy-dart,srawlins/streamy-dart,google/streamy-dart,google/streamy-dart,google/streamy-dart,ronlobo/streamy-dart,srawlins/streamy-dart,srawlins/streamy-dart,ronlobo/streamy-dart,ronlobo/streamy-dart,ronlobo/streamy-dart