If blink1-tiny-server is started with --no-html and an unrecognized uri is requested (eg: /404), then the requests is never completed.

Note that echoing the requested uri back to the client (like was done before version 2.3.0) could open up an XSS, so either don't echo the uri back in the response, or ensure that it is appropriately encoded and that correct http response header (Content-type: application/json? X-Content-Type-Options: nosniff?) is set to ensure that browsers interpret the response as json.