Error code

Chrome ERR_INVALID_HTTP_RESPONSE

CHROMEERR_INVALID_HTTP_RESPONSE
Browser Error Code· An error code shown in a web browser when a page fails to load.

What it means

The server sent a response that is not valid HTTP.

How to fix it

  1. Confirm you are using the correct protocol (http:// vs https://).
  2. Check whether the port is running an HTTP server and not another service.

Not affiliated with Chrome. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.