* implementation. Using a reconstruction of the default Object.toString() prevents OOMs and stack
   * overflows, and helps avoid sensitive data inadvertently ending up in exception messages.
   */
  private void appendResultObject(StringBuilder builder, @CheckForNull Object o) {
    if (o == null) {
      builder.append("null");
    } else if (o == this) {

	// try this server to generate a new token.

	type healResp struct {
		respBytes []byte
		apiErr    APIError
		errBody   string
	}

	// Define a closure to start sending whitespace to client
	// after 10s unless a response item comes in
	keepConnLive := func(w http.ResponseWriter, r *http.Request, respCh chan healResp) {
		ticker := time.NewTicker(time.Second * 10)
		defer ticker.Stop()

* Upgrade code to use the latest version of Starlette, including:
    * Several bug fixes.
    * Optional redirects of slashes, with or without ending in `/`.
    * Events for routers, `"startup"`, and `"shutdown"`.
    * PR [#1057](https://github.com/tiangolo/fastapi/pull/1057).