title: Recover BLOWERIO_URL
body: <p>Say my fat fingers managed to set my BLOWERIO_URL to something invalid:</p>
  
  <pre><code>$ heroku config:set BLOWERIO_URL=https://{user:pass}@api.blower.io/ --app recon-trac
  </code></pre>
  
  <p>How can I recover the correct, working BLOWERIO_URL?</p>
  
  <p>I haven't been able to find any troubleshooting guides in Heroku's so-called "support" section, and Google isn't much help either.</p>
  
  <p>I'm getting "400 Bad Request" when I try to send an SMS. It was broken earlier, and I fixed it by changing the BLOWERIO_URL, and now it's broken again.</p>