HTTP/3's Current State: Challenges and Opportunities on the Path to Adoption

The HTTP/3 specifications are complete but await final publication. Server-side support is surprisingly high, particularly among top websites. Major players like Cloudflare have enabled HTTP/3, and browsers widely support it. However, client-side support, such as in curl, remains incomplete, largely due to the lagging development of QUIC-enabled TLS libraries. OpenSSL's QUIC support has been delayed, while alternatives like BoringSSL and quictls have limitations. While HTTP/3 promises speed improvements, real-world benefits depend on network conditions. Widespread adoption hinges on specification release and mature TLS libraries.