feat: Enable HTTP/2 by default in httpx client#3477
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Adds http2=True to both _DefaultHttpxClient and _DefaultAsyncHttpxClient, and provides an [http2] optional dependency extra for httpx[http2]. HTTP/2 offers meaningful performance benefits: connection reuse, multiplexing, HPACK header compression, and 1-RTT TLS handshake. All major LLM API providers (OpenAI, DeepSeek, Anthropic) already support HTTP/2 via ALPN negotiation. Falls back gracefully to HTTP/1.1 if the server doesn't support h2, or if the h2 package is not installed.
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Check if h2 is importable at module level and set _HTTP2_AVAILABLE accordingly. This lets pip install openai[http2] transparently enable HTTP/2 without breaking users who don't have h2 installed.
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Adds http2=True to both _DefaultHttpxClient and _DefaultAsyncHttpxClient, and provides an [http2] optional dependency extra for httpx[http2].
HTTP/2 offers meaningful performance benefits: connection reuse, multiplexing, HPACK header compression, and 1-RTT TLS handshake. All major LLM API providers (OpenAI, DeepSeek, Anthropic) already support HTTP/2 via ALPN negotiation.
Falls back gracefully to HTTP/1.1 if the server doesn't support h2, or if the h2 package is not installed.
Changes being requested
Enable HTTP/2 by default in the SDK's httpx client for both sync (
_DefaultHttpxClient) and async (_DefaultAsyncHttpxClient) clients.Additional context & links
#3476