A minimal clone of cURL

generate certificates required for -E flag

# Generate a private key
openssl genpkey -algorithm RSA -out client-key.pem

# Generate a certificate signing request (CSR)
openssl req -new -key client-key.pem -out client-req.pem

# Generate a self-signed certificate
openssl x509 -req -days 365 -in client-req.pem -signkey client-key.pem -out client-cert.pem

# Combine key and certificate into a single file
cat client-key.pem client-cert.pem > client.pem

tests to try out different flags

default

./main https://www.keycdn.com

-A

./main -A "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36" https://www.keycdn.com

-E

./main -E client.pem https://www.keycdn.com

-I

./main -I https://www.keycdn.com

-K

./main -K https://www.keycdn.com

-O

./main -O https://nodejs.org/dist/v18.17.0/node-v18.17.0-linux-x64.tar.xz
tar -xf node-v18.17.0-linux-x64.tar.xz
ls node-v18.17.0-linux-x64/