title: Chrome SPDY error when SSL proxying with Charles Proxy on MacOS
body: <p>I would like to have Charles decrypt HTTPS traffic when browsing in Chrome on MacOS.</p>
  
  <p>But when I visit a website (for example, <a href="https://www.facebook.com" rel="noreferrer">https://www.facebook.com</a>), there are errors about <code>net::ERR_SPDY_COMPRESSION_ERROR</code> on multiple resources.</p>
  
  <p><strong>How can I fix this?</strong></p>
  
  <p>Steps I've followed so far:</p>
  
  <ol>
  <li>Open <code>Keychain Access</code>, search for <code>charles</code> and delete every item mentioning <code>charles</code></li>
  <li>Open Charles Proxy, chose <code>Help &gt; SSL Proxying &gt; Save Charles Root Certificate...</code> and save <code>charles-ssl-proxying-certificate.pem</code></li>
  <li>Open <code>Keychain Access</code> again, click <code>File &gt; Import Items...</code>, choose <code>charles-ssl-proxying-certificate.pem</code>, click Open.</li>
  <li>Double click on the new certificate, click <code>Trust</code>, then for <code>When using this certificate:</code> select <code>Always Trust</code></li>
  <li>Close the window, and enter my password in the Certificate Trust Settings popup, and click <code>Update Settings</code></li>
  <li>Close Keychain access.</li>
  <li>In Charles Proxy, select <code>Proxy &gt; Proxy Settings...</code>. Check <code>Enable SSL Proxying</code> and enter <code>*:*</code> in the Location. Click Ok.</li>
  <li>Restart Charles and Chrome.</li>
  <li>Enable MacOS Proxy in Charles.</li>
  <li>Visit <a href="https://www.facebook.com" rel="noreferrer">https://www.facebook.com</a> in Chrome incognito window.</li>
  <li>I see multiple <code>net::ERR_SPDY_COMPRESSION_ERROR</code> errors in the Chrome Inspector Console.</li>
  </ol>
  
  <p>I also tried the same steps, except using Install Charles Root Certificate from the Charles Proxy Help menu, but it results in the same problem.</p>
  
  <pre><code>Charles 4.0.2
  Network: WPA2 WiFi
  VPN: no
  OS: MacOS 10.12.5
  Chrome: 58.0.3029.110
  </code></pre>