Office 365 – SharePoint – SPFx – There was a network problem

In my adventures with the new web parts I ran into the following error when I added my web part to a page: Something went wrong If the problem persists, … read the office-365-sharepoint-spfx-there-was-a-network-problem-this-may-be-a-problem-with-a-https-certificate-make-sure-you-have-the-right-certificate post