HTTP/3 is the third major version of the HTTP protocol, using QUIC as its transport layer instead of TCP. QUIC runs over UDP and mandates TLS 1.3 encryption, providing built-in security, reduced latency, and improved performance, especially on unreliable networks.

Why should I upgrade to HTTP/3?

HTTP/3 provides faster page loads through 0-RTT connection establishment, better performance on mobile networks, improved multiplexing without head-of-line blocking, and enhanced security with mandatory TLS 1.3 encryption. Unlike HTTP/2, QUIC encrypts transport-layer metadata, protecting against certain types of attacks. It's especially beneficial for users on high-latency or packet-loss networks.

QUIC (Quick UDP Internet Connections) is a secure transport protocol that runs over UDP instead of TCP. It mandates TLS 1.3 encryption and provides the functionality of TCP, TLS, and HTTP/2 in a single encrypted layer over UDP. This integration encrypts more connection metadata than traditional HTTPS, reducing connection setup time while improving both security and performance for modern web applications.

What is WebTransport?

WebTransport is a modern web API that provides secure, bidirectional, multiplexed communication over HTTP/3. Built on QUIC with mandatory TLS 1.3 encryption, it enables low-latency, encrypted client-server communication for real-time applications like gaming, video streaming, and collaborative tools. WebTransport inherits QUIC's security features, protecting data in transit while maintaining high performance. It typically runs on ports 443 or 4433.

How does the HTTP/3 and WebTransport scanner work?

The scanner attempts to connect to the target website using HTTP/3, HTTP/2, and HTTP/1.1 protocols. It also tests WebTransport capability on ports 443 and 4433 (or custom ports). The scanner analyzes Alt-Svc headers, QUIC version support, WebTransport availability, server capabilities, and connection performance to provide a comprehensive protocol compatibility report.

⚡ HTTP/3 QUIC & WebTransport Scanner

Test if your website supports HTTP/3, QUIC protocol, and WebTransport

🚀 Test HTTP/3, QUIC & WebTransport Security and Performance

HTTP/3 with QUIC protocol and WebTransport delivers faster page loads, improved reliability, and enhanced security through mandatory TLS 1.3 encryption. Our advanced scanner uses native QUIC libraries to extract detailed metadata including QUIC transport parameters, server implementation fingerprinting (identifying Cloudflare, Google GFE, Facebook mvfst, Fastly H2O, and more), connection metrics (handshake time, TTFB, RTT, packet statistics), and TLS extension analysis. With 5-tier grading (A++, A+, A, C, F) and ML-enhanced recommendations.

HTTP/3 and QUIC protocol detection with native quinn/h3 libraries and TLS 1.3
Server fingerprinting: Identifies Cloudflare, Google GFE, Facebook mvfst, Fastly H2O, and more
QUIC transport parameters: MTU, idle timeout, datagram support, congestion window
Connection metrics: Handshake time, time-to-first-byte, RTT, packets sent/lost
TLS extension analysis: ALPN protocols, key share groups, ECH support detection
WebTransport capability testing with security validation (ports 443, 4433, or custom)
Alt-Svc header analysis and 0-RTT replay attack risk assessment
ML-enhanced recommendations with 3-tier fingerprinting confidence scoring

Website URL Enter domain or full URL to scan

Optional

WebTransport Path Default: /, /webtransport

WebTransport Port Default: 443, 4433

Try these examples:

💡 Three Ways to Use:

Query: ?url=pqcrypta.com

Path: /pqcrypta.com

Manual: Enter URL above

Protocol—

QUIC—

TLS—

PQC—

RTT—

Server—

⚡ Protocol Status

HTTP/3:

HTTP/2:

HTTP/1.1:

QUIC:

Negotiated:

WebTransport:

🔐 TLS Extensions

ALPN:

Key Share:

Versions:

ECH:

PQC Hybrid:

GREASE:

🔧 Technical

Alt-Svc:

Server:

Status:

TLS:

Cipher:

⚡ Connection

Handshake:

TTFB:

RTT:

CWND:

Packets:

Lost:

📦 Transport

Max Data:

UDP MTU:

Idle:

Datagram:

📈 Metrics

Loss:

CC:

MTU:

PMTUD:

RTT Range:

📊 Benefits

0-RTT:

1-RTT:

Multiplex:

HOL Block:

Migration:

🛡️ Security

Addr Valid:

Retry:

Anti-Amp:

Stateless:

Rate Limit:

🔍 Fingerprint

Impl:

Confidence:

Method:

Chars:

🔄 QUIC Version

Current:

Supported:

Drafts:

Negotiation:

Retry:

📋 HTTP/3 Headers

Timing:

Priority:

Accept-CH:

NEL:

Report-To:

103 Hints:

💡 Recommendations

📊 Scan Results

🏆 A++ (0)

Ultimate: HTTP/3 + QUIC + 0-RTT disabled + WebTransport enabled. Maximum security & features.

✅ A+ (0)

Excellent: HTTP/3 with QUIC protocol. 0-RTT disabled for maximum security.

⚡ A (0)

Good: HTTP/3 with QUIC protocol. 0-RTT enabled (replay attack risk).

⚠️ C (0)

Misconfigured: HTTP/3 enabled but not accessible. Missing Alt-Svc header.

❌ F (0)

Failed: No HTTP/3 support detected. Using legacy HTTP/2 or HTTP/1.1 protocols only.

What is HTTP/3 and QUIC?

HTTP/3 is the latest version of the Hypertext Transfer Protocol (RFC 9114), standardized by the IETF in June 2022. Unlike HTTP/1.1 and HTTP/2 which run over TCP, HTTP/3 uses QUIC (Quick UDP Internet Connections) as its transport layer. QUIC operates over UDP with mandatory TLS 1.3 encryption built directly into the transport protocol, delivering 30-50% faster page loads, improved mobile performance, and enhanced security compared to traditional TCP-based protocols.

⚡ Performance Benefits

Faster Connections: QUIC combines the cryptographic handshake with connection establishment (1-RTT), compared to TCP+TLS requiring 2-3 round trips. 0-RTT resumption enables instant reconnection for repeat visitors. Zero Head-of-Line Blocking: Independent streams prevent one slow resource from blocking others, critical for modern web applications with hundreds of assets.

🔒 Security & Privacy

Mandatory Encryption: Unlike HTTP/2 where TLS is optional, HTTP/3 requires TLS 1.3, the most secure version with forward secrecy and modern cipher suites. Transport Metadata Protection: QUIC encrypts packet numbers, connection IDs, and other transport metadata that TCP exposes in plaintext, defending against traffic analysis, fingerprinting, and network-level attacks.

📱 Mobile & Reliability

Connection Migration: Unique connection IDs allow seamless handoff when switching networks (Wi-Fi ↔ cellular) without dropped connections or re-authentication. Improved Loss Recovery: Per-stream acknowledgments and more accurate RTT estimation provide better performance on lossy networks (mobile, satellite, public Wi-Fi). WebTransport: Bidirectional streaming over QUIC enables real-time applications like gaming, video conferencing, and collaborative editing.

🚀 What's Next After HTTP/3 + QUIC + WebTransport?

🌐

QUIC v2 (RFC 9369) + Future Extensions

Active Development

QUIC v1 shipped with several features intentionally deferred for later versions. These are now being standardized:

Multipath QUIC – True simultaneous WiFi + 5G + Ethernet usage. Your connection uses all available networks at once for maximum bandwidth and instant failover.
Forward Error Correction (FEC) – Proactive error recovery without retransmissions. Critical for satellite, 5G mmWave, and lossy networks.
Improved Loss Recovery – Better algorithms for detecting and recovering from packet loss, especially on high-latency paths.
Advanced Congestion Control – BBRv3, Copa, and AI-enhanced algorithms that adapt to network conditions in real-time.
Efficient Connection IDs – Shorter IDs, better privacy, reduced overhead for IoT and edge devices.
Enhanced Handshake Modes – Even faster than 0-RTT for specific use cases like gaming and streaming.

Source: IETF QUIC WG, draft-ietf-quic-multipath, draft-ietf-quic-ack-frequency

🔄

HTTP/3 Extensions (Actively Being Designed)

Design Phase

Future HTTP/3 enhancements being discussed in IETF HTTP WG and research communities:

Partial Reliability – Send only what matters, skip corrupted or outdated data. Perfect for live video where old frames are useless.
Unidirectional Unreliable Streams – For gaming telemetry, sensor data, and real-time metrics where loss is acceptable.
Server Push Redesign – HTTP/2 push was deprecated due to poor adoption. New models being explored for predictive resource delivery.
Better Prioritization – Smarter scheduling algorithms that understand application-level importance, not just stream priorities.
Native Real-Time Media Support – Built-in primitives for video/audio streams without needing WebRTC's complexity.
Capsule Protocol Extensions – Tunneling arbitrary protocols over HTTP/3 (VPNs, databases, custom protocols).

Source: IETF HTTP WG, draft-ietf-httpbis-*, W3C WebTransport specifications

🛰

Beyond HTTP: New Protocol Families

Research Active

Some research is exploring post-HTTP models entirely, rethinking how the internet routes and delivers content:

Content-Centric Networking (CCN / NDN) – Routing based on content hashes, not server IPs. Request "video/abc123" from the network, get it from the nearest cache automatically.
Peer-to-Peer Transport Layers – Browser-native P2P without WebRTC's overhead. Think BitTorrent-level efficiency for web content delivery.
Encrypted-by-Default Object Protocols – IPFS-like content addressing but standardized at the transport layer. Every object is cryptographically verified.
Information-Centric Internet Architecture – Fundamental redesign where data flows are named and secured, not tied to specific servers or locations.

Source: IRTF ICNRG, ACM ICN workshops, Named Data Networking project

🔥

WebTransport → WebRTC Replacement

Active Development

WebTransport is already positioned as the successor to WebRTC for many use cases. Future directions include:

WebTransport over Multipath QUIC – Real-time streams that seamlessly use WiFi + cellular simultaneously for maximum reliability.
WebTransport with Partial Reliability – Choose reliability per-stream: reliable for chat messages, unreliable for game positions, partially reliable for video.
WebTransport for Real-Time Media – Native video/audio codec integration, replacing WebRTC's SDP complexity with simpler APIs.
Browser-to-Browser WebTransport – Direct peer connections without STUN/TURN servers, using QUIC's connection migration.
WebTransport Pooling – Share QUIC connections across browser tabs for lower overhead and faster startup.

Source: W3C WebTransport WG, IETF QUIC WG discussions, Chrome/Firefox roadmaps

🧠

AI-Optimized Networking

Research Active

Not standards yet, but active research in academia and industry (Google, Meta, Cloudflare):

AI-Driven Congestion Control – Neural networks that learn network behavior patterns and optimize throughput better than traditional algorithms.
Predictive Packet Scheduling – ML models that predict which packets will be needed next based on user behavior and application state.
Adaptive Protocol Negotiation – Automatically switch between QUIC, TCP, or future protocols based on real-time network conditions and application requirements.
Smart Connection Migration – AI decides when to switch networks, pre-warms connections, predicts handoffs before they happen.
Traffic Pattern Recognition – Identify application types (video, gaming, browsing) and apply custom optimizations automatically.

Source: ACM SIGCOMM, Google Research (Remy, PCC Vivace), Meta's Robustness team

🧩

QUIC for Everything (Beyond Web)

Early Implementations

QUIC is expanding beyond HTTP/3 into databases, microservices, and system infrastructure:

Database Protocols over QUIC – MySQL, PostgreSQL, MongoDB replication using QUIC for better latency and connection migration. Already prototyped by Cloudflare.
gRPC over QUIC – Microservice RPC with 0-RTT reconnection, multiplexed streams, and better mobile support. Google is actively working on this.
Service Mesh QUIC Backplanes – Istio, Linkerd, Consul using QUIC for inter-service communication instead of TCP. Better observability and performance.
DNS over QUIC (DoQ) – RFC 9250 standardized. Faster, more private DNS queries with connection reuse. Cloudflare, Google DNS support it.
SSH over QUIC – Persistent remote shells that survive network changes. No more "connection lost" when switching networks.
IoT Protocols over QUIC – MQTT, CoAP running over QUIC for better reliability on unstable networks (satellites, cellular).

Source: RFC 9250 (DNS over QUIC), gRPC roadmap, CNCF service mesh projects

🏁

The Complete Roadmap

Summary

Layer	Current Cutting Edge	Next / Future	Status
Transport	QUIC v1	QUIC v2 (RFC 9369), Multipath, FEC	v2: RFC +Drafts
HTTP	HTTP/3 (RFC 9114)	Partial reliability, better prioritization	Design Phase
Real-Time	WebTransport	Multipath + media + P2P	Active Dev
Architecture	Client/Server	Content-centric, P2P	Research
Performance	TLS 1.3 + QUIC	AI-optimized transport	Research
Beyond Web	HTTP/3 + WebTransport	QUIC for databases, RPC, IoT	Early Impl

🚀 The Next Wave of Innovation

The technologies coming next are:

QUIC v2 with multipath and FEC
HTTP/3 extensions with partial reliability
WebTransport++ replacing WebRTC
AI-optimized transport layers
QUIC everywhere (databases, microservices, IoT)

Timeline: QUIC v2 RFC 9369 (2023), Multipath QUIC (2025-2026), HTTP/3 extensions (2026-2027), AI-optimized (2027-2030), Content-centric networks (2030+)

📋

Technology Verification Status

Current standardization and implementation status of emerging technologies:

Technology	Status	Evidence
QUIC v2	✅ Standardized	RFC 9369
Multipath QUIC	❌ Not standardized	No RFC
QUIC FEC	❌ Research only	No RFC
HTTP/3 partial reliability	❌ Draft only	No RFC
WebTransport multipath	❌ Not implemented	No browser support
AI congestion control	❌ Research only	SIGCOMM papers
DNS over QUIC	✅ Standardized	RFC 9250
QUIC for databases	⚠️ Experimental	Cloudflare prototypes
QUIC service mesh	⚠️ Experimental	CNCF projects
Content-centric networking	❌ Research only	ICNRG

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