the headers record: 2 names
  User-Agent: gBASIC-book-reader/1.0 (you@example.com)
  Accept: application/json

a number as a header value:
  webclient request header values must be strings
a URL that is not one:
  webclient URL is malformed
nobody answered:
  error.source is webclient and error.code is 3001

and the program is still running.

json_encode: {"animal":"a newt","seen_at":null}
encode:      {"animal":"a newt","seen_at":nothing}
