OpenAI: Migrating to HTTPX2
Summary
OpenAI's Python SDK has migrated to HTTPX2, phasing out the old httpx dependency. The guide covers default and custom HTTP client usage, TLS trust-store changes that rely on the OS certificate store, and migration steps including environment variables and new HTTPX2 client classes. It also includes guidance on testing, mocks, and legacy HTTPX workarounds during migration.