title: What certificates does 'curl' use by default?
body: <p>What certificates does 'curl' use by default?</p>
  
  <p>Example:</p>
  
  <pre><code>curl -I -L https://cruises.webjet.com.au
  </code></pre>
  
  <p>fails on Ubuntu 15.04 with</p>
  
  <pre><code>curl: (60) SSL certificate problem: unable to get local issuer certificate
  </code></pre>
  
  <p>But when I add the root certificate (see <a href="https://www.ssllabs.com/ssltest/analyze.html?d=cruises.webjet.com.au&amp;latest" rel="noreferrer">https://www.ssllabs.com/ssltest/analyze.html?d=cruises.webjet.com.au&amp;latest</a>) and run </p>
  
  <pre><code>curl -I -L --cacert downlaodedCert.pem https://cruises.webjet.com.au
  </code></pre>
  
  <p>everything is fine. So I guess 'curl' doesn't use this root certificate by default.</p>
  
  <p>But how can I see which certs it uses?</p>