title: Application Insights JS trackException shows "Failed method: 'Unkown'"
body: <p>I'm experimenting with AppInsights and use the following code:
  (fetch fails with a 500 reply)</p>
  
  <pre><code>private callMethod(): void {
    this._callMethodInternal();
  }
  
  private async _callMethodInternal(): Promise&lt;void&gt; {
    try {
      await fetch("https://localhost:44369/api/values", {
        method: "GET",
        headers: {
          Accept: "application/json",
          "Content-Type": "text/json"
        }
      });
    } catch (err) {
      AppInsights.trackException(err);
  
      throw err;
    }
  }
  </code></pre>
  
  <p>The exception is shown in Application Insights, but the "Failed method" property shows "Unknown" as value.
  Is there a way to show the correct method name?</p>
  
  <p>Thanks</p>
  
  <p>(<a href="https://github.com/Microsoft/ApplicationInsights-JS/issues/680" rel="nofollow noreferrer">https://github.com/Microsoft/ApplicationInsights-JS/issues/680</a>)</p>