curl --http1.0 'http://localhost:8000/http_version/10'
curl --http1.0 'http://localhost:8000/http_version/10'
curl 'http://localhost:8000/http_version/11'
curl --http1.1 'http://localhost:8000/http_version/11'
curl --http1.1 'http://localhost:8000/http_version/11'
curl 'http://localhost:8000/http_version/11'
curl --head --http1.0 'https://google.com'
curl --head --http1.1 'https://google.com'