Installing curl with http3 on MacOS

When you are all said and done with this tutorial, you'll be able to double check http3 support via the curl command like this:

curl --http3 https://cloudflare-quic.com -I
HTTP/3 200
date: Fri, 24 Jul 2020 08:10:24 GMT
content-type: text/html
content-length: 106072
set-cookie: __cfduid=d8647a359d68a89c060bde4f373e18cc61595578224; expires=Sun, 23-Aug-20 08:10:24 GMT; path=/; domain=.cloudflare-quic.com; HttpOnly; SameSite=Lax; Secure
cf-request-id: 042178a64b0000188b7b1d9200000001
expect-ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
server: cloudflare
cf-ray: 5b7c2a1d4eb5188b-MAN
alt-svc: h3-27=":443"; ma=86400, h3-28=":443"; ma=86400, h3-29=":443"; ma=86400

Unfortunately, this currently involves building curl from source, luckily for us, cloudflare makes this even easier.

Note: You must have https://brew.sh/ installed already

# Clean up any old version of curl you may have already tried to install
brew remove -f curl

# Download the curl ruby install script provided by cloudflare
wget https://raw.githubusercontent.com/cloudflare/homebrew-cloudflare/master/curl.rb

# Install curl via that script from the latest git repos
brew install --HEAD -s curl.rb

# Tell your cli to use the curl version just installed (if you're using zsh, othwerise you might need `~/.bashrc`)
echo 'export PATH="/usr/local/opt/curl/bin:$PATH"' >> ~/.zshrc

# Reload your config
source ~/.zshrc

# Double check it's using the right curl
which curl # Should output "/usr/local/opt/curl/bin/curl"

# Double check http3
$ curl --version | grep HTTP3
  Features: alt-svc AsynchDNS brotli HTTP2 HTTP3 IDN IPv6 Largefile libz MultiSSL NTLM NTLM_WB SSL UnixSockets zstd

# Try curl on any HTTP/3 enabled sites.
curl --http3 https://blog.cloudflare.com -I

Have fun upgrading all the servers!

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Installing curl with http3 on MacOS

Justin

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