If for some reason you need to disable automatic conversion of underscores to hyphens, set the parameter `convert_underscores` of `Header` to `False`:

=== "Python 3.10+"

    ```Python hl_lines="10"
    {!> ../../../docs_src/header_params/tutorial002_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="11"

from typing import Union

from fastapi import FastAPI, Header

app = FastAPI()


@app.get("/items/")
async def read_items(
    strange_header: Union[str, None] = Header(default=None, convert_underscores=False),
):

from typing import Annotated, Union

from fastapi import FastAPI, Header

app = FastAPI()


@app.get("/items/")
async def read_items(
    strange_header: Annotated[
        Union[str, None], Header(convert_underscores=False)
    ] = None,
):

=== "Python 3.10+"

    ```Python hl_lines="8"
    {!> ../../../docs_src/header_params/tutorial002_py310.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="10"
    {!> ../../../docs_src/header_params/tutorial002.py!}
    ```

!!! warning "Aviso"

from fastapi import FastAPI, Header

app = FastAPI()


@app.get("/items/")
async def read_items(
    strange_header: str | None = Header(default=None, convert_underscores=False),
):

from fastapi import FastAPI, Header
from typing_extensions import Annotated

app = FastAPI()


@app.get("/items/")
async def read_items(
    strange_header: Annotated[
        Union[str, None], Header(convert_underscores=False)
    ] = None,
):

Wenn Sie aus irgendeinem Grund das automatische Konvertieren von Unterstrichen zu Bindestrichen abschalten möchten, setzen Sie den Parameter `convert_underscores` auf `False`.

=== "Python 3.10+"

    ```Python hl_lines="10"
    {!> ../../../docs_src/header_params/tutorial002_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="11"

from typing import Annotated

from fastapi import FastAPI, Header

app = FastAPI()


@app.get("/items/")
async def read_items(
    strange_header: Annotated[str | None, Header(convert_underscores=False)] = None,
):

🚥 🤔 👆 💪 ❎ 🏧 🛠️ 🎦 🔠, ⚒ 🔢 `convert_underscores` `Header` `False`:

=== "🐍 3️⃣.6️⃣ & 🔛"

    ```Python hl_lines="10"
    {!> ../../../docs_src/header_params/tutorial002.py!}
    ```

=== "🐍 3️⃣.1️⃣0️⃣ & 🔛"

    ```Python hl_lines="8"
    {!> ../../../docs_src/header_params/tutorial002_py310.py!}
    ```

!!! warning
    ⏭ ⚒ `convert_underscores` `False`, 🐻 🤯 👈 🇺🇸🔍 🗳 & 💽 / ⚙️ 🎚 ⏮️ 🎦.

package cmd

import "github.com/minio/minio/internal/bucket/lifecycle"

//go:generate stringer -type lcEventSrc -trimprefix lcEventSrc_ $GOFILE
type lcEventSrc uint8

//revive:disable:var-naming Underscores is used here to indicate where common prefix ends and the enumeration name begins
const (
	lcEventSrc_None lcEventSrc = iota
	lcEventSrc_Heal
	lcEventSrc_Scanner
	lcEventSrc_Decom
	lcEventSrc_Rebal