I recently watched the video class on Web Programming and Development and was greatly intrigued by the ability to serve web related work locally before CloudDeploy'ing. In the video class, the StartWebServer function was used so I immediately stopped the on demand video to try it out. After realizing the StartWebServer command was not "standard" (at least not found in the standard Mathematica docs), I was able to uncover it lives in HTTPHandling. I'm running Mathematica 11.2.0.0 on Mac OS 10.13.2 and executing the command below fails. HTTPHandling`StartWebServer[ExportForm["Hello", "HTML"]] The error message reported is: WebServer: The HTTP server failed to start with error code None and stderr output: EndOfFile. Any ideas what I'm doing wrong? Perhaps there is some other dependency I need. Regards.

Good news, I just got around to trying this with the most recent 11.3 release and it WORKS!!!

@Carlo Barbieri, totally understand. I actually prefer that it was added since according to some of my research it appears others have made some progress with it. Knowing that I'm not do anything wrong is OK for now as I [anxiously] wait for next releases until it does. The fact that there will be a much better option than what I'm doing now with CloudDeploy to test things has me really excited. Thanks for your work in this area. Regards.

Yeah, when we gave the talk it wasn't even in builds. Now we've added it to the WL, but left it hidden in plain sight without documenting it because we knew it didn't yet have the level of polish and reliability our users would expect.

Mathematica Local WebServer on Mac OS X Failed to Start