Open source. Open possibilities.

Caddy is an extensible, multi-platform web server written in Go that provides automatic HTTPS by default and supports HTTP/1.1, HTTP/2, and HTTP/3.

curl is a widely used command-line tool and the libcurl library for transferring data to and from servers using URL syntax, with broad protocol support including HTTP, HTTPS, FTP, SFTP, SMTP, IMAP, MQTT, WebSocket and more.

Echo is a high-performance, extensible and minimalist Go web framework built on Go's standard net/http, offering a radix-tree router, request binding, grouping, a middleware ecosystem, centralized error handling, HTTP/2 and automatic TLS.