Check which HTTP protocols your server supports — HTTP/1.1, HTTP/2, and HTTP/3 (QUIC)
HTTP/2 improves performance with multiplexing, header compression, and server push. HTTP/3 uses QUIC (UDP-based transport) for faster connections, reduced latency, and better handling of packet loss. Check if your server supports these modern protocols to ensure optimal performance.
The tool checks HTTP/2 and HTTP/3 (QUIC) protocol support on your server. HTTP/2 provides request multiplexing, header compression (HPACK), and Server Push. HTTP/3 uses QUIC instead of TCP, further reducing latency, especially on mobile networks.
HTTP/2 provides multiplexing, header compression, and server push — typically reducing page load time by 15-30%. HTTP/3 (QUIC) adds 0-RTT connection establishment and improved performance on mobile networks with packet loss. Our tool tests ALPN negotiation and shows which protocols your server actually supports.
After verifying protocol support, check page speed to measure the actual performance impact. Ensure your SSL/TLS configuration supports at least TLS 1.2 — HTTP/2 requires it, and HTTP/3 requires TLS 1.3.
HTTP/2 uses multiplexing (multiple requests over one connection), header compression (HPACK), stream prioritization, and binary format. This significantly speeds up page loading compared to HTTP/1.1.
HTTP/3 is the latest protocol version, based on QUIC instead of TCP. QUIC eliminates head-of-line blocking, supports 0-RTT connections, and has built-in TLS 1.3. Faster on unstable networks (mobile, Wi-Fi).
Nginx: add http2 to the listen directive (listen 443 ssl http2). Apache: enable mod_http2 and add Protocols h2 http/1.1. HTTPS is required. Check support with our tool after configuration.
Multiplexing allows sending multiple requests and responses simultaneously over a single TCP connection. In HTTP/1.1, requests are processed sequentially, creating delays. This is the main advantage of HTTP/2.
ALPN (Application-Layer Protocol Negotiation) is a TLS extension that allows client and server to negotiate the protocol (h2, http/1.1) during the TLS handshake. Without ALPN, HTTP/2 will not work over HTTPS.
HTTP/3 provides advantages on mobile networks and with high packet loss. For most sites, HTTP/2 is sufficient. HTTP/3 is automatically supported through Cloudflare, Fastly, and other CDNs. Check support with our tool.