This is not a bug.

--silent only silences curl's "extra" output. Data you ask for from a URL will still be output as usual. --head to a HTTP URL will thus output a HEAD response.

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** [bugs:#1231] 7.26.0 Option --silent does not work with --head**
**Status:** pending-invalid
**Created:** Tue May 28, 2013 05:50 AM UTC by Jari Aalto
**Last Updated:** Tue May 28, 2013 05:50 AM UTC
**Owner:** Daniel Stenberg
In order to "run link checks" in scrips, it would be beneficial to use both of these options:
  curl --head --silent $URL || echo "FAIL: $URL"
Unfortunately the --silent option does not suppress the HEAD output in 7.26.0.
    $ curl --head --silent http://www.google.com/
    HTTP/1.1 302 Found
    Location: http://www.google.fi/
    Cache-Control: private
    Content-Type: text/html; charset=UTF-8
    ...
    Date: Tue, 28 May 2013 05:46:09 GMT
    Server: gws
    Content-Length: 218
    X-XSS-Protection: 1; mode=block
    X-Frame-Options: SAMEORIGIN
    $ echo $?
    0
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