--

src/nercone_website/tools/tls_test/http3.py

@@ -0,0 +1,47 @@
+from __future__ import annotations
+import asyncio
+from dataclasses import dataclass
+
+
+@dataclass
+class Http3Info:
+    supported: bool = False
+    error: str | None = None
+
+
+async def probe_http3(host: str, port: int, sni: str | None, timeout: float = 6.0) -> Http3Info:
+    """Attempt a QUIC handshake to determine HTTP/3 availability.
+
+    Uses aioquic if available. On any failure returns supported=False.
+    """
+    try:
+        from aioquic.asyncio.client import connect
+        from aioquic.quic.configuration import QuicConfiguration
+        from aioquic.quic.events import HandshakeCompleted
+    except Exception as e:
+        return Http3Info(supported=False, error=f"aioquic unavailable: {e}")
+
+    info = Http3Info()
+    try:
+        configuration = QuicConfiguration(
+            is_client=True,
+            alpn_protocols=["h3", "h3-29"],
+            verify_mode=None,
+        )
+        try:
+            import ssl as _ssl
+            configuration.verify_mode = _ssl.CERT_NONE
+        except Exception:
+            pass
+        host_for_quic = sni or host
+
+        async def _run():
+            async with connect(host, port, configuration=configuration, server_name=host_for_quic) as client:
+                await client.wait_connected()
+                return True
+        ok = await asyncio.wait_for(_run(), timeout=timeout)
+        info.supported = bool(ok)
+    except Exception as e:
+        info.supported = False
+        info.error = f"{e.__class__.__name__}: {e}"
+    return info