`new URL("//", origin)` threw inside the http request handler, so a
request like `GET //` escaped as an uncaught main-process TypeError and
was never answered. Reject unparseable targets up front.
`new URL("//", origin)` threw inside the http request handler, so a
request like `GET //` escaped as an uncaught main-process TypeError and
was never answered. Reject unparseable targets up front.