title: How to fix certificate errors when using curl?
body: <p>When I attempt to download from dl.google.com I receive this error : </p>
  
  <pre><code>ERROR: The certificate of `dl.google.com' is not trusted.
  ERROR: The certificate of `dl.google.com' hasn't got a known issuer.
  </code></pre>
  
  <p>Here is entire command output</p>
  
  <pre><code>$ curl https://dl.google.com/dl/cloudsdk/release/install_google_cloud_sdk.bash
  | bash
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                   Dload  Upload   Total   Spent    Left  Speed
  100  3607  100  3607    0     0   2820      0  0:00:01  0:00:01 --:--:--  3125
  bash: line 77: [: Files: binary operator expected
  wget -O - https://dl.google.com/dl/cloudsdk/release/google-cloud-sdk.tar.gz &gt; tm
  p.4wwaU246zk/google-cloud-sdk.tar.gz
  --2013-12-12 11:05:41--  https://dl.google.com/dl/cloudsdk/release/google-cloud-
  sdk.tar.gz
  Resolving my.proxy.com my.proxy.com)... x.x.x.x
  Connecting to my.proxy.com (my.proxy.com)|x.x.x.x|:1234... conne
  cted.
  ERROR: The certificate of `dl.google.com' is not trusted.
  ERROR: The certificate of `dl.google.com' hasn't got a known issuer.
  </code></pre>
  
  <p>Reading this question : <a href="https://stackoverflow.com/questions/9224298/how-do-i-fix-certificate-errors-when-running-wget-on-an-https-url-in-cygwin">How do I fix certificate errors when running wget on an HTTPS URL in Cygwin?</a> an option is to 
  "add the --no-check-certificate option on the wget command-line" but since I'm using curl instead of wget is there a similar option for above command ?</p>
  
  <p>Update : I've tried </p>
  
  <pre><code>curl -k https://dl.google.com/dl/cloudsdk/release/install_google_cloud_sdk.ba
  sh | bash
  </code></pre>
  
  <p>But same error, could the proxy/firewall be blocking the connection ?</p>