Getting only response header from HTTP POST using cURL

Question

One can request only the headers using HTTP HEAD, as option -I in curl(1).

$ curl -I / 

Lengthy HTML response bodies are a pain to get in command-line, so I'd like to get only the header as feedback for my POST requests. However, HEAD and POST are two different methods.

How do I get cURL to display only response headers to a POST request?

Answer 1

-D, --dump-header <file>        Write the protocol headers to the specified file.         This  option  is handy to use when you want to store the headers        that a HTTP site sends to you. Cookies from  the  headers  could        then  be  read  in  a  second  curl  invocation by using the -b,        --cookie option! The -c, --cookie-jar option is however a better        way to store cookies. 

and

-S, --show-error        When used with -s, --silent, it makes curl show an error message if it fails. 

and

-L/--location       (HTTP/HTTPS) If the server reports that the requested page has moved to a different location (indicated with a Location: header and a 3XX response       code), this option will make curl redo the request on the new place. If used together with -i/--include or -I/--head, headers from  all  requested       pages  will  be  shown.  When authentication is used, curl only sends its credentials to the initial host. If a redirect takes curl to a different       host, it won’t be able to intercept the user+password. See also --location-trusted on how to change this. You can limit the amount of redirects to       follow by using the --max-redirs option.        When curl follows a redirect and the request is not a plain GET (for example POST or PUT), it will do the following request with a GET if the HTTP       response was 301, 302, or 303. If the response code was any other 3xx code, curl will re-send the following  request  using  the  same  unmodified       method. 

from the man page. so

curl -sSL -D - www.acooke.org -o /dev/null 

follows redirects, dumps the headers to stdout and sends the data to /dev/null (that's a GET, not a POST, but you can do the same thing with a POST - just add whatever option you're already using for POSTing data)

note the - after the -D which indicates that the output "file" is stdout.