feat: Add httpcore based HTTP2Transport (#3588)

All our ingest endpoints support HTTP/2 and some even HTTP/3 which are significantly more efficient compared to HTTP/1.1 with multiplexing and, header compression, connection reuse and 0-RTT TLS.

This patch adds an experimental HTTP2Transport with the help of httpcore library. It makes minimal changes to the original HTTPTransport that said with httpcore we should be able to implement asyncio support easily and remove the worker logic (see #2824).

This should also open the door for future HTTP/3 support (see encode/httpx#275).


---------

Co-authored-by: Ivana Kellyer <[email protected]>

requirements-testing.txt

@@ -10,4 +10,6 @@ executing
 asttokens
 responses
 pysocks
+socksio
+httpcore[http2]
 setuptools

sentry_sdk/client.py

@@ -23,7 +23,7 @@
 )
 from sentry_sdk.serializer import serialize
 from sentry_sdk.tracing import trace
-from sentry_sdk.transport import HttpTransport, make_transport
+from sentry_sdk.transport import BaseHttpTransport, make_transport
 from sentry_sdk.consts import (
     DEFAULT_MAX_VALUE_LENGTH,
     DEFAULT_OPTIONS,
@@ -427,7 +427,7 @@ def _capture_envelope(envelope):
             self.monitor
             or self.metrics_aggregator
             or has_profiling_enabled(self.options)
-            or isinstance(self.transport, HttpTransport)
+            or isinstance(self.transport, BaseHttpTransport)
         ):
             # If we have anything on that could spawn a background thread, we
             # need to check if it's safe to use them.

sentry_sdk/consts.py

@@ -60,6 +60,7 @@ class EndpointType(Enum):
             "otel_powered_performance": Optional[bool],
             "transport_zlib_compression_level": Optional[int],
             "transport_num_pools": Optional[int],
+            "transport_http2": Optional[bool],
             "enable_metrics": Optional[bool],
             "before_emit_metric": Optional[
                 Callable[[str, MetricValue, MeasurementUnit, MetricTags], bool]