renderFile method
Renders a file by streaming its content to the response.
The file
parameter is the File object to render.
Implementation
void renderFile(File file) {
var fileStream = file.openRead();
rq.response.headers
.set('Content-type', lookupMimeType(file.path).toString());
rq.response.addStream(fileStream).then((value) async {
await rq.writeAndClose('');
});
}