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Check whether a website supports HTTP/2

harmlessnginxalle
Adjust the values, the command updates live
user@server
curl -sI --http2 https://example.com/ | head -1

Offers HTTP/2 to the server and prints the first response line. If it reads HTTP/2 200, HTTP/2 is active, while HTTP/1.1 200 means only the old protocol is spoken. On Plesk, HTTP/2 for nginx can be enabled under Tools & Settings.

Also searched as

  • check if http2 is enabled
  • test http/2 curl
  • which http version does my site use

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Check the browser caching headers of a file

$curl -sI https://example.com/wp-includes/css/dist/block-library/style.min.css | grep -iE "^(cache-control|expires|etag|last-modified|age):"
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Check whether a website serves gzip or Brotli

$curl -s -o /dev/null -D - -H "Accept-Encoding: br, gzip" https://example.com/ | grep -i "^content-encoding"
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Check if LiteSpeed Cache serves a page from cache

$curl -s -o /dev/null -D - https://example.com/ | grep -iE "^(server|x-litespeed-cache[a-z-]*):"
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Measure HTTP load times and TTFB with curl

$curl -o /dev/null -sS -w 'DNS: %{time_namelookup}s Connect: %{time_connect}s TLS: %{time_appconnect}s TTFB: %{time_starttransfer}s Gesamt: %{time_total}s\n' https://example.com/
harmlessNetwork

Measure the HTML and header size of a page

$curl -s -o /dev/null -w 'Status: %{http_code} Header: %{size_header} Bytes HTML: %{size_download} Bytes\n' https://example.com/
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Detect the web server and PHP version from HTTP headers

$curl -sI https://example.com/ | grep -iE "^(server|x-powered-by|via):"
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