Support HTTP/3

Author: karpetrosyan

httpcore/__init__.py

@@ -3,6 +3,7 @@
     AsyncConnectionInterface,
     AsyncConnectionPool,
     AsyncHTTP2Connection,
+    AsyncHTTP3Connection,
     AsyncHTTP11Connection,
     AsyncHTTPConnection,
     AsyncHTTPProxy,
@@ -40,6 +41,7 @@
     ConnectionInterface,
     ConnectionPool,
     HTTP2Connection,
+    HTTP3Connection,
     HTTP11Connection,
     HTTPConnection,
     HTTPProxy,
@@ -85,6 +87,7 @@ def __init__(self, *args, **kwargs):  # type: ignore
     "AsyncHTTPProxy",
     "AsyncHTTP11Connection",
     "AsyncHTTP2Connection",
+    "AsyncHTTP3Connection",
     "AsyncConnectionInterface",
     "AsyncSOCKSProxy",
     # sync
@@ -93,6 +96,7 @@ def __init__(self, *args, **kwargs):  # type: ignore
     "HTTPProxy",
     "HTTP11Connection",
     "HTTP2Connection",
+    "HTTP3Connection",
     "ConnectionInterface",
     "SOCKSProxy",
     # network backends, implementations

httpcore/_async/__init__.py

@@ -16,6 +16,18 @@ def __init__(self, *args, **kwargs) -> None:  # type: ignore
             )
 
 
+try:
+    from .http3 import AsyncHTTP3Connection
+except ImportError:  # pragma: nocover
+
+    class AsyncHTTP3Connection:  # type: ignore
+        def __init__(self, *args, **kwargs) -> None:  # type: ignore
+            raise RuntimeError(
+                "Attempted to use http3 support, but the `aioquic` package is not "
+                "installed. Use 'pip install httpcore[http3]'."
+            )
+
+
 try:
     from .socks_proxy import AsyncSOCKSProxy
 except ImportError:  # pragma: nocover
@@ -34,6 +46,7 @@ def __init__(self, *args, **kwargs) -> None:  # type: ignore
     "AsyncHTTPProxy",
     "AsyncHTTP11Connection",
     "AsyncHTTP2Connection",
+    "AsyncHTTP3Connection",
     "AsyncConnectionInterface",
     "AsyncSOCKSProxy",
 ]