Full Support for HTTP/3 Protocol

We are excited to announce that AdguardPrivate now fully supports the HTTP/3 protocol. All existing users will automatically upgrade to enjoy the performance improvements brought by HTTP/3, with no additional configuration required.

Important Update Notes

• iOS Users: You can now use HTTP/3 directly via the DoH protocol, enjoying lower network latency
• Android Users: Due to system limitations, the DoT protocol is still in use; support will be available after future Google updates
• Performance Boost: Initial response speed is significantly improved compared to HTTP/2, with faster connection establishment
• Smart Switching: In network environments that do not support HTTP/3, the system will automatically switch to HTTP/2 to ensure service stability

In-Depth Analysis of HTTP/3 Technology

HTTP/3, as the latest version of the HTTP protocol, is based on Google’s QUIC transport protocol and brings several innovative technical advantages:

Core Features

1. QUIC Protocol Based on UDP

   • Significantly reduces connection establishment time
   • Improved multiplexing capabilities
   • Smarter packet loss handling mechanisms

2. Optimized Performance

   • Zero handshake latency (0-RTT)
   • Enhanced congestion control
   • Connection migration support

3. Enhanced Security

   • Integrated TLS 1.3
   • Encrypted handshake process
   • Reduced risk of man-in-the-middle attacks

Connection Establishment Comparison

Usage Recommendations

• Ensure your client supports the HTTP/3 protocol
• Keep your client version updated
• In restricted network environments, the system will automatically downgrade to HTTP/2

Notes

• UDP traffic may be restricted in some regions, affecting HTTP/3 performance
• Performance may vary under different network conditions
• The system will automatically select the optimal protocol based on network conditions

References

• HTTP/3 Specification Document
• Detailed Explanation of QUIC Protocol
• IETF HTTP/3 Standard

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