RequestServer.serveEmbeddedHttp

void serveEmbeddedHttp(alias  fun,  CustomCgi =  Cgi,  long  maxContentLength =  defaultMaxContentLength)(ThisFor!fun _this)

Runs the embedded HTTP thread server specifically, regardless of which build configuration you have.

If you want the forking worker process server, you do need to compile with the embedded_httpd_processes config though.