curl headers only

How to grep only the response headers

Show headers response

curl --head -i https://google.com

# HTTP/2 301
# retry-after: 0
# location: https://www.reddit.com/
# accept-ranges: bytes
# date: Sun, 21 Jun 2020 18:24:47 GMT
# via: 1.1 varnish
# x-served-by: cache-osl6520-OSL
# x-cache: HIT
# x-cache-hits: 0
# x-timer: S1592763887.014756,VS0,VE0
# cache-control: private, max-age=3600
# strict-transport-security: max-age=15552000; includeSubDomains; preload
# server: snooserv
# content-length: 0

Show headers response as if you ask from google.com

This might be useful when debugging CORS errors.

curl -H "Origin: http://google.com" --head https://reddit.com

# HTTP/2 301
# retry-after: 0
# location: https://www.reddit.com/
# accept-ranges: bytes
# date: Sun, 21 Jun 2020 18:23:58 GMT
# via: 1.1 varnish
# x-served-by: cache-osl6524-OSL
# x-cache: HIT
# x-cache-hits: 0
# x-timer: S1592763839.825368,VS0,VE0
# cache-control: private, max-age=3600
# strict-transport-security: max-age=15552000; includeSubDomains; preload
# server: snooserv
# content-length: 0