curl --head (-I)

-I, --head Show document info only

curl -I

curl -Is

-i, --include       Include protocol response headers in the output

Examples

 curl -I https://google.com
HTTP/2 301
location: https://www.google.com/
content-type: text/html; charset=UTF-8
date: Wed, 13 Oct 2021 10:22:25 GMT
expires: Wed, 13 Oct 2021 10:22:25 GMT
cache-control: private, max-age=2592000
server: gws
content-length: 220
x-xss-protection: 0
x-frame-options: SAMEORIGIN
set-cookie: CONSENT=PENDING+234; expires=Fri, 01-Jan-2038 00:00:00 GMT; path=/; domain=.google.com; Secure
p3p: CP="This is not a P3P policy! See g.co/p3phelp for more info."
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000,h3-T051=":443"; ma=2592000,h3-Q050=":443"; ma=2592000,h3-Q046=":443"; ma=2592000,h3- 
Q043=":443"; ma=2592000,quic=":443"; ma=2592000; v="46,43"

curl -I --http2 https://google.com
HTTP/2 301
location: https://www.google.com/
content-type: text/html; charset=UTF-8
date: Wed, 13 Oct 2021 10:31:33 GMT
expires: Wed, 13 Oct 2021 10:31:33 GMT
cache-control: private, max-age=2592000
server: gws
content-length: 220
x-xss-protection: 0
x-frame-options: SAMEORIGIN
set-cookie: CONSENT=PENDING+087; expires=Fri, 01-Jan-2038 00:00:00 GMT; path=/; domain=.google.com; Secure
p3p: CP="This is not a P3P policy! See g.co/p3phelp for more info."
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000,h3-T051=":443"; ma=2592000,h3-Q050=":443"; ma=2592000,h3-Q046=":443"; ma=2592000,h3- 
Q043=":443"; ma=2592000,quic=":443"; ma=2592000; v="46,43"

curl -Is https://google.com | head -1
HTTP/2 301

Related

curl -Is https://yourdomain.com | head -1
curl -k or curl --insecure

See also

• cURL, curl -s, -X, -x, curl -T, curl --help, curl -L, curl -m, curl -o, curl -X POST, curl -d, curl --header, curl -I, curl --silent, curl -Is, curl -k or curl --insecure, curl -XPUT, curl -d, ~/.curlrc, curl -i, curl --version, curl --help
• HTTP, HTTP client, HTTP/1.1, HTTP/2, HTTP/3, HTTPS, HSTS CSR, TLS, SSL, openSSL, WebSockets, WebRTC, ssl_certificate QUIC, HPKP, CT, List of HTTP status codes, URL redirection, Content-type:, Webhook, HTTP headers, --insecure, Axios HTTP client, HTTP cookies, HTTP ETag, Hypertext Transfer Protocol -- HTTP/1.1