Fixes

• 🐛 Fix, avoid yield from a TaskGroup, only as an async context manager, closed in the request async exit stack. PR #15038 by @tiangolo.

Docs

• ✏️ Fix typo in docs/en/docs/_llm-test.md. PR #15007 by @adityagiri3600.
• 📝 Update Skill, optimize context, trim and refactor into references. PR #15031 by @tiangolo.

Internal

• 👥 Update FastAPI People - Experts. PR #15037 by @tiangolo.
• 👥 Update FastAPI People - Contributors and Translators. PR #15029 by @tiangolo.
• 👥 Update FastAPI GitHub topic repositories. PR #15036 by @tiangolo.

Features

• ✨ Add support for Server Sent Events. PR #15030 by @tiangolo.
  • New docs: Server-Sent Events (SSE).

Features

• ✨ Add support for streaming JSON Lines and binary data with yield. PR #15022 by @tiangolo.
  • This also upgrades Starlette from >=0.40.0 to >=0.46.0, as it's needed to properly unrwap and re-raise exceptions from exception groups.
  • New docs: Stream JSON Lines.
  • And new docs: Stream Data.

Docs

• 📝 Update Library Agent Skill with streaming responses. PR #15024 by @tiangolo.
• 📝 Update docs for responses and new stream with yield. PR #15023 by @tiangolo.
• 📝 Add await in StreamingResponse code example to allow cancellation. PR #14681 by @casperdcl.
• 📝 Rename docs_src/websockets to docs_src/websockets_ to avoid import errors. PR #14979 by @YuriiMotov.

Internal

• 🔨 Run tests with pytest-xdist and pytest-cov. PR #14992 by @YuriiMotov.

Features

• 🔧 Add FastAPI Agent Skill. PR #14982 by @tiangolo.
  • Read more about it in Library Agent Skills.

Internal

• ✅ Fix all tests are skipped on Windows. PR #14994 by @YuriiMotov.

Upgrades

• ⬆️ Add support for Starlette 1.0.0+. PR #14987 by @tiangolo.

Refactors

• ♻️ Refactor logic to handle OpenAPI and Swagger UI escaping data. PR #14986 by @tiangolo.

Internal

• 👥 Update FastAPI People - Experts. PR #14972 by @tiangolo.
• 👷 Allow skipping benchmark job in test workflow. PR #14974 by @YuriiMotov.

Breaking Changes

• 🔒️ Add strict_content_type checking for JSON requests. PR #14978 by @tiangolo.
  • Now FastAPI checks, by default, that JSON requests have a Content-Type header with a valid JSON value, like application/json, and rejects requests that don't.
  • If the clients for your app don't send a valid Content-Type header you can disable this with strict_content_type=False.
  • Check the new docs: Strict Content-Type Checking.

Internal

• ⬆ Bump flask from 3.1.2 to 3.1.3. PR #14949 by @dependabot[bot].
• ⬆ Update all dependencies to use griffelib instead of griffe. PR #14973 by @svlandeg.
• 🔨 Fix FastAPI People workflow. PR #14951 by @YuriiMotov.
• 👷 Do not run codspeed with coverage as it's not tracked. PR #14966 by @tiangolo.
• 👷 Do not include benchmark tests in coverage to speed up coverage processing. PR #14965 by @tiangolo.

Breaking Changes

• 🗑️ Deprecate ORJSONResponse and UJSONResponse. PR #14964 by @tiangolo.

Features

• ✨ Serialize JSON response with Pydantic (in Rust), when there's a Pydantic return type or response model. PR #14962 by @tiangolo.
  • This results in 2x (or more) performance increase for JSON responses.
  • New docs: Custom Response - JSON Performance.

Internal

• ⬆️ Upgrade pytest. PR #14959 by @tiangolo.
• 👷 Fix CI, do not attempt to publish fastapi-slim. PR #14958 by @tiangolo.
• ➖ Drop support for fastapi-slim, no more versions will be released, use only "fastapi[standard]" or fastapi. PR #14957 by @tiangolo.
• 🔧 Update pyproject.toml, remove unneeded lines. PR #14956 by @tiangolo.