message: Whitelist another known spurious curl error
  Seen recently in comments on
diff: @@ -47,6 +47,7 @@ fn maybe_spurious(err: &Error) -> bool {
  || curl_err.is_couldnt_resolve_host()
  || curl_err.is_operation_timedout()
  || curl_err.is_recv_error()
  + || curl_err.is_http2_error()
  || curl_err.is_http2_stream_error()
  || curl_err.is_ssl_connect_error()
  || curl_err.is_partial_file()
  