callback_router5 = APIRouter()


@callback_router5.get("/")
async def callback5(level5: str):
    pass  # pragma: nocover


app = FastAPI(
    dependencies=[Depends(dep0)],
    responses={
        400: {"description": "Client error level 0"},
        500: {"description": "Server error level 0"},
    },
    default_response_class=ResponseLevel0,
    callbacks=callback_router0.routes,
)

* Fix typo in docs. PR [#411](https://github.com/tiangolo/fastapi/pull/411) by [@bronsen](https://github.com/bronsen).
* Fix parsing a body type declared with `Union`. PR [#400](https://github.com/tiangolo/fastapi/pull/400) by [@koxudaxi](https://github.com/koxudaxi).

## 0.34.0

'aa'         // illegal: too many characters
'\k'         // illegal: k is not recognized after a backslash
'\xa'        // illegal: too few hexadecimal digits
'\0'         // illegal: too few octal digits
'\400'       // illegal: octal value over 255
'\uDFFF'     // illegal: surrogate half
'\U00110000' // illegal: invalid Unicode code point
</pre>


<h3 id="String_literals">String literals</h3>

<p>