traceparent: str | None = None
    x_tag: list[str] = []


@app.get("/items/")
async def read_items(headers: Annotated[CommonHeaders, Header()]):
    return headers
```

Read the new docs: [Header Parameter Models](https://fastapi.tiangolo.com/tutorial/header-param-models/).

#### `Cookie` Parameter Models

Use Pydantic models for `Cookie` parameters:

```python

# Release 2.17.1

### Bug Fixes and Other Changes

* Add necessary header files in the aar library. These are needed if developers build apps with header files unpacked from tflite aar files from maven.
* Implement Name() for GCSWritableFile to fix the profiler trace viewer cache file generation.

- Kube-apiserver: multiple comma-separated protocols in a single X-Stream-Protocol-Version header are now recognized, in addition to multiple headers, complying with RFC2616 ([#89857](https://github.com/kubernetes/kubernetes/pull/89857), [@tedyu](https://github.com/tedyu)) [SIG API Machinery]

pkg syscall (freebsd-arm64), type InterfaceAddrMessage struct, Header IfaMsghdr
pkg syscall (freebsd-arm64), type InterfaceAnnounceMessage //deprecated
pkg syscall (freebsd-arm64), type InterfaceAnnounceMessage struct
pkg syscall (freebsd-arm64), type InterfaceAnnounceMessage struct, Header IfAnnounceMsghdr
pkg syscall (freebsd-arm64), type InterfaceMessage //deprecated

pkg syscall (freebsd-riscv64), type InterfaceAddrMessage struct, Header IfaMsghdr #53466
pkg syscall (freebsd-riscv64), type InterfaceAnnounceMessage //deprecated #53466
pkg syscall (freebsd-riscv64), type InterfaceAnnounceMessage struct #53466
pkg syscall (freebsd-riscv64), type InterfaceAnnounceMessage struct, Header IfAnnounceMsghdr #53466
pkg syscall (freebsd-riscv64), type InterfaceMessage //deprecated #53466

b[size:] } } // DefaultReader is a sentinel type, embedded in the default // [crypto/rand.Reader], used to recognize it when passed to // APIs that accept a rand io.Reader. type DefaultReader interface{ defaultReader() } // ReadWithReader uses Reader to fill b with cryptographically secure random // bytes. It is intended for use in APIs that expose a rand io.Reader. // // If Reader is not the default Reader from crypto/rand, // [randutil.MaybeReadByte] and [fips140.RecordNonApproved] are called....

default // [crypto/rand.Reader], used to recognize it when passed to // APIs that accept a rand io.Reader. // // Any Reader that implements this interface is assumed to // call [Read] as its Read method. type DefaultReader interface{ defaultReader() } // ReadWithReader uses Reader to fill b with cryptographically secure random // bytes. It is intended for use in APIs that expose a rand io.Reader. func ReadWithReader(r io.Reader, b []byte) error { if _, ok := r.(DefaultReader); ok { Read(b) return nil }...