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Custom Response Classes - File, HTML, Redirect, Streaming, etc.

There are several custom response classes you can use to create an instance and return them directly from your path operations.

Read more about it in the FastAPI docs for Custom Response - HTML, Stream, File, others.

You can import them directly from fastapi.responses:

from fastapi.responses import (
    FileResponse,
    HTMLResponse,
    JSONResponse,
    ORJSONResponse,
    PlainTextResponse,
    RedirectResponse,
    Response,
    StreamingResponse,
    UJSONResponse,
)

FastAPI Responses

There are a couple of custom FastAPI response classes, you can use them to optimize JSON performance.

fastapi.responses.UJSONResponse 

UJSONResponse(
    content,
    status_code=200,
    headers=None,
    media_type=None,
    background=None,
)

Bases: JSONResponse

JSON response using the high-performance ujson library to serialize data to JSON.

Read more about it in the FastAPI docs for Custom Response - HTML, Stream, File, others.

PARAMETER DESCRIPTION
content

TYPE: Any

status_code

TYPE: int DEFAULT: 200

headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

media_type

TYPE: Optional[str] DEFAULT: None

background

TYPE: Optional[BackgroundTask] DEFAULT: None

Source code in starlette/responses.py 
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def __init__(
    self,
    content: typing.Any,
    status_code: int = 200,
    headers: typing.Optional[typing.Mapping[str, str]] = None,
    media_type: typing.Optional[str] = None,
    background: typing.Optional[BackgroundTask] = None,
) -> None:
    super().__init__(content, status_code, headers, media_type, background)

charset class-attribute instance-attribute 

charset = 'utf-8'

status_code instance-attribute 

status_code = status_code

media_type class-attribute instance-attribute 

media_type = 'application/json'

body instance-attribute 

body = render(content)

background instance-attribute 

background = background

headers property 

headers

render 

render(content)
PARAMETER DESCRIPTION
content

TYPE: Any

Source code in fastapi/responses.py 
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def render(self, content: Any) -> bytes:
    assert ujson is not None, "ujson must be installed to use UJSONResponse"
    return ujson.dumps(content, ensure_ascii=False).encode("utf-8")

init_headers 

init_headers(headers=None)
PARAMETER DESCRIPTION
headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

Source code in starlette/responses.py 
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def init_headers(
    self, headers: typing.Optional[typing.Mapping[str, str]] = None
) -> None:
    if headers is None:
        raw_headers: typing.List[typing.Tuple[bytes, bytes]] = []
        populate_content_length = True
        populate_content_type = True
    else:
        raw_headers = [
            (k.lower().encode("latin-1"), v.encode("latin-1"))
            for k, v in headers.items()
        ]
        keys = [h[0] for h in raw_headers]
        populate_content_length = b"content-length" not in keys
        populate_content_type = b"content-type" not in keys

    body = getattr(self, "body", None)
    if (
        body is not None
        and populate_content_length
        and not (self.status_code < 200 or self.status_code in (204, 304))
    ):
        content_length = str(len(body))
        raw_headers.append((b"content-length", content_length.encode("latin-1")))

    content_type = self.media_type
    if content_type is not None and populate_content_type:
        if content_type.startswith("text/"):
            content_type += "; charset=" + self.charset
        raw_headers.append((b"content-type", content_type.encode("latin-1")))

    self.raw_headers = raw_headers

set_cookie(
    key,
    value="",
    max_age=None,
    expires=None,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

value

TYPE: str DEFAULT: ''

max_age

TYPE: Optional[int] DEFAULT: None

expires

TYPE: Optional[Union[datetime, str, int]] DEFAULT: None

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def set_cookie(
    self,
    key: str,
    value: str = "",
    max_age: typing.Optional[int] = None,
    expires: typing.Optional[typing.Union[datetime, str, int]] = None,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    cookie: "http.cookies.BaseCookie[str]" = http.cookies.SimpleCookie()
    cookie[key] = value
    if max_age is not None:
        cookie[key]["max-age"] = max_age
    if expires is not None:
        if isinstance(expires, datetime):
            cookie[key]["expires"] = format_datetime(expires, usegmt=True)
        else:
            cookie[key]["expires"] = expires
    if path is not None:
        cookie[key]["path"] = path
    if domain is not None:
        cookie[key]["domain"] = domain
    if secure:
        cookie[key]["secure"] = True
    if httponly:
        cookie[key]["httponly"] = True
    if samesite is not None:
        assert samesite.lower() in [
            "strict",
            "lax",
            "none",
        ], "samesite must be either 'strict', 'lax' or 'none'"
        cookie[key]["samesite"] = samesite
    cookie_val = cookie.output(header="").strip()
    self.raw_headers.append((b"set-cookie", cookie_val.encode("latin-1")))

delete_cookie(
    key,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def delete_cookie(
    self,
    key: str,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    self.set_cookie(
        key,
        max_age=0,
        expires=0,
        path=path,
        domain=domain,
        secure=secure,
        httponly=httponly,
        samesite=samesite,
    )

fastapi.responses.ORJSONResponse 

ORJSONResponse(
    content,
    status_code=200,
    headers=None,
    media_type=None,
    background=None,
)

Bases: JSONResponse

JSON response using the high-performance orjson library to serialize data to JSON.

Read more about it in the FastAPI docs for Custom Response - HTML, Stream, File, others.

PARAMETER DESCRIPTION
content

TYPE: Any

status_code

TYPE: int DEFAULT: 200

headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

media_type

TYPE: Optional[str] DEFAULT: None

background

TYPE: Optional[BackgroundTask] DEFAULT: None

Source code in starlette/responses.py 
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def __init__(
    self,
    content: typing.Any,
    status_code: int = 200,
    headers: typing.Optional[typing.Mapping[str, str]] = None,
    media_type: typing.Optional[str] = None,
    background: typing.Optional[BackgroundTask] = None,
) -> None:
    super().__init__(content, status_code, headers, media_type, background)

charset class-attribute instance-attribute 

charset = 'utf-8'

status_code instance-attribute 

status_code = status_code

media_type class-attribute instance-attribute 

media_type = 'application/json'

body instance-attribute 

body = render(content)

background instance-attribute 

background = background

headers property 

headers

render 

render(content)
PARAMETER DESCRIPTION
content

TYPE: Any

Source code in fastapi/responses.py 
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def render(self, content: Any) -> bytes:
    assert orjson is not None, "orjson must be installed to use ORJSONResponse"
    return orjson.dumps(
        content, option=orjson.OPT_NON_STR_KEYS | orjson.OPT_SERIALIZE_NUMPY
    )

init_headers 

init_headers(headers=None)
PARAMETER DESCRIPTION
headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

Source code in starlette/responses.py 
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def init_headers(
    self, headers: typing.Optional[typing.Mapping[str, str]] = None
) -> None:
    if headers is None:
        raw_headers: typing.List[typing.Tuple[bytes, bytes]] = []
        populate_content_length = True
        populate_content_type = True
    else:
        raw_headers = [
            (k.lower().encode("latin-1"), v.encode("latin-1"))
            for k, v in headers.items()
        ]
        keys = [h[0] for h in raw_headers]
        populate_content_length = b"content-length" not in keys
        populate_content_type = b"content-type" not in keys

    body = getattr(self, "body", None)
    if (
        body is not None
        and populate_content_length
        and not (self.status_code < 200 or self.status_code in (204, 304))
    ):
        content_length = str(len(body))
        raw_headers.append((b"content-length", content_length.encode("latin-1")))

    content_type = self.media_type
    if content_type is not None and populate_content_type:
        if content_type.startswith("text/"):
            content_type += "; charset=" + self.charset
        raw_headers.append((b"content-type", content_type.encode("latin-1")))

    self.raw_headers = raw_headers

set_cookie(
    key,
    value="",
    max_age=None,
    expires=None,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

value

TYPE: str DEFAULT: ''

max_age

TYPE: Optional[int] DEFAULT: None

expires

TYPE: Optional[Union[datetime, str, int]] DEFAULT: None

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def set_cookie(
    self,
    key: str,
    value: str = "",
    max_age: typing.Optional[int] = None,
    expires: typing.Optional[typing.Union[datetime, str, int]] = None,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    cookie: "http.cookies.BaseCookie[str]" = http.cookies.SimpleCookie()
    cookie[key] = value
    if max_age is not None:
        cookie[key]["max-age"] = max_age
    if expires is not None:
        if isinstance(expires, datetime):
            cookie[key]["expires"] = format_datetime(expires, usegmt=True)
        else:
            cookie[key]["expires"] = expires
    if path is not None:
        cookie[key]["path"] = path
    if domain is not None:
        cookie[key]["domain"] = domain
    if secure:
        cookie[key]["secure"] = True
    if httponly:
        cookie[key]["httponly"] = True
    if samesite is not None:
        assert samesite.lower() in [
            "strict",
            "lax",
            "none",
        ], "samesite must be either 'strict', 'lax' or 'none'"
        cookie[key]["samesite"] = samesite
    cookie_val = cookie.output(header="").strip()
    self.raw_headers.append((b"set-cookie", cookie_val.encode("latin-1")))

delete_cookie(
    key,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def delete_cookie(
    self,
    key: str,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    self.set_cookie(
        key,
        max_age=0,
        expires=0,
        path=path,
        domain=domain,
        secure=secure,
        httponly=httponly,
        samesite=samesite,
    )

Starlette Responses

fastapi.responses.FileResponse 

FileResponse(
    path,
    status_code=200,
    headers=None,
    media_type=None,
    background=None,
    filename=None,
    stat_result=None,
    method=None,
    content_disposition_type="attachment",
)

Bases: Response

PARAMETER DESCRIPTION
path

TYPE: Union[str, PathLike[str]]

status_code

TYPE: int DEFAULT: 200

headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

media_type

TYPE: Optional[str] DEFAULT: None

background

TYPE: Optional[BackgroundTask] DEFAULT: None

filename

TYPE: Optional[str] DEFAULT: None

stat_result

TYPE: Optional[stat_result] DEFAULT: None

method

TYPE: Optional[str] DEFAULT: None

content_disposition_type

TYPE: str DEFAULT: 'attachment'

Source code in starlette/responses.py 
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def __init__(
    self,
    path: typing.Union[str, "os.PathLike[str]"],
    status_code: int = 200,
    headers: typing.Optional[typing.Mapping[str, str]] = None,
    media_type: typing.Optional[str] = None,
    background: typing.Optional[BackgroundTask] = None,
    filename: typing.Optional[str] = None,
    stat_result: typing.Optional[os.stat_result] = None,
    method: typing.Optional[str] = None,
    content_disposition_type: str = "attachment",
) -> None:
    self.path = path
    self.status_code = status_code
    self.filename = filename
    if method is not None:
        warnings.warn(
            "The 'method' parameter is not used, and it will be removed.",
            DeprecationWarning,
        )
    if media_type is None:
        media_type = guess_type(filename or path)[0] or "text/plain"
    self.media_type = media_type
    self.background = background
    self.init_headers(headers)
    if self.filename is not None:
        content_disposition_filename = quote(self.filename)
        if content_disposition_filename != self.filename:
            content_disposition = "{}; filename*=utf-8''{}".format(
                content_disposition_type, content_disposition_filename
            )
        else:
            content_disposition = '{}; filename="{}"'.format(
                content_disposition_type, self.filename
            )
        self.headers.setdefault("content-disposition", content_disposition)
    self.stat_result = stat_result
    if stat_result is not None:
        self.set_stat_headers(stat_result)

chunk_size class-attribute instance-attribute 

chunk_size = 64 * 1024

charset class-attribute instance-attribute 

charset = 'utf-8'

status_code instance-attribute 

status_code = status_code

media_type instance-attribute 

media_type = media_type

body instance-attribute 

body = render(content)

background instance-attribute 

background = background

headers property 

headers

render 

render(content)
PARAMETER DESCRIPTION
content

TYPE: Any

Source code in starlette/responses.py 
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def render(self, content: typing.Any) -> bytes:
    if content is None:
        return b""
    if isinstance(content, bytes):
        return content
    return content.encode(self.charset)  # type: ignore

init_headers 

init_headers(headers=None)
PARAMETER DESCRIPTION
headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

Source code in starlette/responses.py 
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def init_headers(
    self, headers: typing.Optional[typing.Mapping[str, str]] = None
) -> None:
    if headers is None:
        raw_headers: typing.List[typing.Tuple[bytes, bytes]] = []
        populate_content_length = True
        populate_content_type = True
    else:
        raw_headers = [
            (k.lower().encode("latin-1"), v.encode("latin-1"))
            for k, v in headers.items()
        ]
        keys = [h[0] for h in raw_headers]
        populate_content_length = b"content-length" not in keys
        populate_content_type = b"content-type" not in keys

    body = getattr(self, "body", None)
    if (
        body is not None
        and populate_content_length
        and not (self.status_code < 200 or self.status_code in (204, 304))
    ):
        content_length = str(len(body))
        raw_headers.append((b"content-length", content_length.encode("latin-1")))

    content_type = self.media_type
    if content_type is not None and populate_content_type:
        if content_type.startswith("text/"):
            content_type += "; charset=" + self.charset
        raw_headers.append((b"content-type", content_type.encode("latin-1")))

    self.raw_headers = raw_headers

set_cookie(
    key,
    value="",
    max_age=None,
    expires=None,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

value

TYPE: str DEFAULT: ''

max_age

TYPE: Optional[int] DEFAULT: None

expires

TYPE: Optional[Union[datetime, str, int]] DEFAULT: None

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def set_cookie(
    self,
    key: str,
    value: str = "",
    max_age: typing.Optional[int] = None,
    expires: typing.Optional[typing.Union[datetime, str, int]] = None,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    cookie: "http.cookies.BaseCookie[str]" = http.cookies.SimpleCookie()
    cookie[key] = value
    if max_age is not None:
        cookie[key]["max-age"] = max_age
    if expires is not None:
        if isinstance(expires, datetime):
            cookie[key]["expires"] = format_datetime(expires, usegmt=True)
        else:
            cookie[key]["expires"] = expires
    if path is not None:
        cookie[key]["path"] = path
    if domain is not None:
        cookie[key]["domain"] = domain
    if secure:
        cookie[key]["secure"] = True
    if httponly:
        cookie[key]["httponly"] = True
    if samesite is not None:
        assert samesite.lower() in [
            "strict",
            "lax",
            "none",
        ], "samesite must be either 'strict', 'lax' or 'none'"
        cookie[key]["samesite"] = samesite
    cookie_val = cookie.output(header="").strip()
    self.raw_headers.append((b"set-cookie", cookie_val.encode("latin-1")))

delete_cookie(
    key,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def delete_cookie(
    self,
    key: str,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    self.set_cookie(
        key,
        max_age=0,
        expires=0,
        path=path,
        domain=domain,
        secure=secure,
        httponly=httponly,
        samesite=samesite,
    )

fastapi.responses.HTMLResponse 

HTMLResponse(
    content=None,
    status_code=200,
    headers=None,
    media_type=None,
    background=None,
)

Bases: Response

PARAMETER DESCRIPTION
content

TYPE: Any DEFAULT: None

status_code

TYPE: int DEFAULT: 200

headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

media_type

TYPE: Optional[str] DEFAULT: None

background

TYPE: Optional[BackgroundTask] DEFAULT: None

Source code in starlette/responses.py 
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def __init__(
    self,
    content: typing.Any = None,
    status_code: int = 200,
    headers: typing.Optional[typing.Mapping[str, str]] = None,
    media_type: typing.Optional[str] = None,
    background: typing.Optional[BackgroundTask] = None,
) -> None:
    self.status_code = status_code
    if media_type is not None:
        self.media_type = media_type
    self.background = background
    self.body = self.render(content)
    self.init_headers(headers)

charset class-attribute instance-attribute 

charset = 'utf-8'

status_code instance-attribute 

status_code = status_code

media_type class-attribute instance-attribute 

media_type = 'text/html'

body instance-attribute 

body = render(content)

background instance-attribute 

background = background

headers property 

headers

render 

render(content)
PARAMETER DESCRIPTION
content

TYPE: Any

Source code in starlette/responses.py 
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def render(self, content: typing.Any) -> bytes:
    if content is None:
        return b""
    if isinstance(content, bytes):
        return content
    return content.encode(self.charset)  # type: ignore

init_headers 

init_headers(headers=None)
PARAMETER DESCRIPTION
headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

Source code in starlette/responses.py 
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def init_headers(
    self, headers: typing.Optional[typing.Mapping[str, str]] = None
) -> None:
    if headers is None:
        raw_headers: typing.List[typing.Tuple[bytes, bytes]] = []
        populate_content_length = True
        populate_content_type = True
    else:
        raw_headers = [
            (k.lower().encode("latin-1"), v.encode("latin-1"))
            for k, v in headers.items()
        ]
        keys = [h[0] for h in raw_headers]
        populate_content_length = b"content-length" not in keys
        populate_content_type = b"content-type" not in keys

    body = getattr(self, "body", None)
    if (
        body is not None
        and populate_content_length
        and not (self.status_code < 200 or self.status_code in (204, 304))
    ):
        content_length = str(len(body))
        raw_headers.append((b"content-length", content_length.encode("latin-1")))

    content_type = self.media_type
    if content_type is not None and populate_content_type:
        if content_type.startswith("text/"):
            content_type += "; charset=" + self.charset
        raw_headers.append((b"content-type", content_type.encode("latin-1")))

    self.raw_headers = raw_headers

set_cookie(
    key,
    value="",
    max_age=None,
    expires=None,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

value

TYPE: str DEFAULT: ''

max_age

TYPE: Optional[int] DEFAULT: None

expires

TYPE: Optional[Union[datetime, str, int]] DEFAULT: None

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def set_cookie(
    self,
    key: str,
    value: str = "",
    max_age: typing.Optional[int] = None,
    expires: typing.Optional[typing.Union[datetime, str, int]] = None,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    cookie: "http.cookies.BaseCookie[str]" = http.cookies.SimpleCookie()
    cookie[key] = value
    if max_age is not None:
        cookie[key]["max-age"] = max_age
    if expires is not None:
        if isinstance(expires, datetime):
            cookie[key]["expires"] = format_datetime(expires, usegmt=True)
        else:
            cookie[key]["expires"] = expires
    if path is not None:
        cookie[key]["path"] = path
    if domain is not None:
        cookie[key]["domain"] = domain
    if secure:
        cookie[key]["secure"] = True
    if httponly:
        cookie[key]["httponly"] = True
    if samesite is not None:
        assert samesite.lower() in [
            "strict",
            "lax",
            "none",
        ], "samesite must be either 'strict', 'lax' or 'none'"
        cookie[key]["samesite"] = samesite
    cookie_val = cookie.output(header="").strip()
    self.raw_headers.append((b"set-cookie", cookie_val.encode("latin-1")))

delete_cookie(
    key,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def delete_cookie(
    self,
    key: str,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    self.set_cookie(
        key,
        max_age=0,
        expires=0,
        path=path,
        domain=domain,
        secure=secure,
        httponly=httponly,
        samesite=samesite,
    )

fastapi.responses.JSONResponse 

JSONResponse(
    content,
    status_code=200,
    headers=None,
    media_type=None,
    background=None,
)

Bases: Response

PARAMETER DESCRIPTION
content

TYPE: Any

status_code

TYPE: int DEFAULT: 200

headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

media_type

TYPE: Optional[str] DEFAULT: None

background

TYPE: Optional[BackgroundTask] DEFAULT: None

Source code in starlette/responses.py 
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def __init__(
    self,
    content: typing.Any,
    status_code: int = 200,
    headers: typing.Optional[typing.Mapping[str, str]] = None,
    media_type: typing.Optional[str] = None,
    background: typing.Optional[BackgroundTask] = None,
) -> None:
    super().__init__(content, status_code, headers, media_type, background)

charset class-attribute instance-attribute 

charset = 'utf-8'

status_code instance-attribute 

status_code = status_code

media_type class-attribute instance-attribute 

media_type = 'application/json'

body instance-attribute 

body = render(content)

background instance-attribute 

background = background

headers property 

headers

render 

render(content)
PARAMETER DESCRIPTION
content

TYPE: Any

Source code in starlette/responses.py 
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def render(self, content: typing.Any) -> bytes:
    return json.dumps(
        content,
        ensure_ascii=False,
        allow_nan=False,
        indent=None,
        separators=(",", ":"),
    ).encode("utf-8")

init_headers 

init_headers(headers=None)
PARAMETER DESCRIPTION
headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

Source code in starlette/responses.py 
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def init_headers(
    self, headers: typing.Optional[typing.Mapping[str, str]] = None
) -> None:
    if headers is None:
        raw_headers: typing.List[typing.Tuple[bytes, bytes]] = []
        populate_content_length = True
        populate_content_type = True
    else:
        raw_headers = [
            (k.lower().encode("latin-1"), v.encode("latin-1"))
            for k, v in headers.items()
        ]
        keys = [h[0] for h in raw_headers]
        populate_content_length = b"content-length" not in keys
        populate_content_type = b"content-type" not in keys

    body = getattr(self, "body", None)
    if (
        body is not None
        and populate_content_length
        and not (self.status_code < 200 or self.status_code in (204, 304))
    ):
        content_length = str(len(body))
        raw_headers.append((b"content-length", content_length.encode("latin-1")))

    content_type = self.media_type
    if content_type is not None and populate_content_type:
        if content_type.startswith("text/"):
            content_type += "; charset=" + self.charset
        raw_headers.append((b"content-type", content_type.encode("latin-1")))

    self.raw_headers = raw_headers

set_cookie(
    key,
    value="",
    max_age=None,
    expires=None,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

value

TYPE: str DEFAULT: ''

max_age

TYPE: Optional[int] DEFAULT: None

expires

TYPE: Optional[Union[datetime, str, int]] DEFAULT: None

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def set_cookie(
    self,
    key: str,
    value: str = "",
    max_age: typing.Optional[int] = None,
    expires: typing.Optional[typing.Union[datetime, str, int]] = None,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    cookie: "http.cookies.BaseCookie[str]" = http.cookies.SimpleCookie()
    cookie[key] = value
    if max_age is not None:
        cookie[key]["max-age"] = max_age
    if expires is not None:
        if isinstance(expires, datetime):
            cookie[key]["expires"] = format_datetime(expires, usegmt=True)
        else:
            cookie[key]["expires"] = expires
    if path is not None:
        cookie[key]["path"] = path
    if domain is not None:
        cookie[key]["domain"] = domain
    if secure:
        cookie[key]["secure"] = True
    if httponly:
        cookie[key]["httponly"] = True
    if samesite is not None:
        assert samesite.lower() in [
            "strict",
            "lax",
            "none",
        ], "samesite must be either 'strict', 'lax' or 'none'"
        cookie[key]["samesite"] = samesite
    cookie_val = cookie.output(header="").strip()
    self.raw_headers.append((b"set-cookie", cookie_val.encode("latin-1")))

delete_cookie(
    key,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def delete_cookie(
    self,
    key: str,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    self.set_cookie(
        key,
        max_age=0,
        expires=0,
        path=path,
        domain=domain,
        secure=secure,
        httponly=httponly,
        samesite=samesite,
    )

fastapi.responses.PlainTextResponse 

PlainTextResponse(
    content=None,
    status_code=200,
    headers=None,
    media_type=None,
    background=None,
)

Bases: Response

PARAMETER DESCRIPTION
content

TYPE: Any DEFAULT: None

status_code

TYPE: int DEFAULT: 200

headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

media_type

TYPE: Optional[str] DEFAULT: None

background

TYPE: Optional[BackgroundTask] DEFAULT: None

Source code in starlette/responses.py 
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def __init__(
    self,
    content: typing.Any = None,
    status_code: int = 200,
    headers: typing.Optional[typing.Mapping[str, str]] = None,
    media_type: typing.Optional[str] = None,
    background: typing.Optional[BackgroundTask] = None,
) -> None:
    self.status_code = status_code
    if media_type is not None:
        self.media_type = media_type
    self.background = background
    self.body = self.render(content)
    self.init_headers(headers)

charset class-attribute instance-attribute 

charset = 'utf-8'

status_code instance-attribute 

status_code = status_code

media_type class-attribute instance-attribute 

media_type = 'text/plain'

body instance-attribute 

body = render(content)

background instance-attribute 

background = background

headers property 

headers

render 

render(content)
PARAMETER DESCRIPTION
content

TYPE: Any

Source code in starlette/responses.py 
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def render(self, content: typing.Any) -> bytes:
    if content is None:
        return b""
    if isinstance(content, bytes):
        return content
    return content.encode(self.charset)  # type: ignore

init_headers 

init_headers(headers=None)
PARAMETER DESCRIPTION
headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

Source code in starlette/responses.py 
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def init_headers(
    self, headers: typing.Optional[typing.Mapping[str, str]] = None
) -> None:
    if headers is None:
        raw_headers: typing.List[typing.Tuple[bytes, bytes]] = []
        populate_content_length = True
        populate_content_type = True
    else:
        raw_headers = [
            (k.lower().encode("latin-1"), v.encode("latin-1"))
            for k, v in headers.items()
        ]
        keys = [h[0] for h in raw_headers]
        populate_content_length = b"content-length" not in keys
        populate_content_type = b"content-type" not in keys

    body = getattr(self, "body", None)
    if (
        body is not None
        and populate_content_length
        and not (self.status_code < 200 or self.status_code in (204, 304))
    ):
        content_length = str(len(body))
        raw_headers.append((b"content-length", content_length.encode("latin-1")))

    content_type = self.media_type
    if content_type is not None and populate_content_type:
        if content_type.startswith("text/"):
            content_type += "; charset=" + self.charset
        raw_headers.append((b"content-type", content_type.encode("latin-1")))

    self.raw_headers = raw_headers

set_cookie(
    key,
    value="",
    max_age=None,
    expires=None,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

value

TYPE: str DEFAULT: ''

max_age

TYPE: Optional[int] DEFAULT: None

expires

TYPE: Optional[Union[datetime, str, int]] DEFAULT: None

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def set_cookie(
    self,
    key: str,
    value: str = "",
    max_age: typing.Optional[int] = None,
    expires: typing.Optional[typing.Union[datetime, str, int]] = None,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    cookie: "http.cookies.BaseCookie[str]" = http.cookies.SimpleCookie()
    cookie[key] = value
    if max_age is not None:
        cookie[key]["max-age"] = max_age
    if expires is not None:
        if isinstance(expires, datetime):
            cookie[key]["expires"] = format_datetime(expires, usegmt=True)
        else:
            cookie[key]["expires"] = expires
    if path is not None:
        cookie[key]["path"] = path
    if domain is not None:
        cookie[key]["domain"] = domain
    if secure:
        cookie[key]["secure"] = True
    if httponly:
        cookie[key]["httponly"] = True
    if samesite is not None:
        assert samesite.lower() in [
            "strict",
            "lax",
            "none",
        ], "samesite must be either 'strict', 'lax' or 'none'"
        cookie[key]["samesite"] = samesite
    cookie_val = cookie.output(header="").strip()
    self.raw_headers.append((b"set-cookie", cookie_val.encode("latin-1")))

delete_cookie(
    key,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def delete_cookie(
    self,
    key: str,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    self.set_cookie(
        key,
        max_age=0,
        expires=0,
        path=path,
        domain=domain,
        secure=secure,
        httponly=httponly,
        samesite=samesite,
    )

fastapi.responses.RedirectResponse 

RedirectResponse(
    url, status_code=307, headers=None, background=None
)

Bases: Response

PARAMETER DESCRIPTION
url

TYPE: Union[str, URL]

status_code

TYPE: int DEFAULT: 307

headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

background

TYPE: Optional[BackgroundTask] DEFAULT: None

Source code in starlette/responses.py 
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def __init__(
    self,
    url: typing.Union[str, URL],
    status_code: int = 307,
    headers: typing.Optional[typing.Mapping[str, str]] = None,
    background: typing.Optional[BackgroundTask] = None,
) -> None:
    super().__init__(
        content=b"", status_code=status_code, headers=headers, background=background
    )
    self.headers["location"] = quote(str(url), safe=":/%#?=@[]!$&'()*+,;")

charset class-attribute instance-attribute 

charset = 'utf-8'

status_code instance-attribute 

status_code = status_code

media_type class-attribute instance-attribute 

media_type = None

body instance-attribute 

body = render(content)

background instance-attribute 

background = background

headers property 

headers

render 

render(content)
PARAMETER DESCRIPTION
content

TYPE: Any

Source code in starlette/responses.py 
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def render(self, content: typing.Any) -> bytes:
    if content is None:
        return b""
    if isinstance(content, bytes):
        return content
    return content.encode(self.charset)  # type: ignore

init_headers 

init_headers(headers=None)
PARAMETER DESCRIPTION
headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

Source code in starlette/responses.py 
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def init_headers(
    self, headers: typing.Optional[typing.Mapping[str, str]] = None
) -> None:
    if headers is None:
        raw_headers: typing.List[typing.Tuple[bytes, bytes]] = []
        populate_content_length = True
        populate_content_type = True
    else:
        raw_headers = [
            (k.lower().encode("latin-1"), v.encode("latin-1"))
            for k, v in headers.items()
        ]
        keys = [h[0] for h in raw_headers]
        populate_content_length = b"content-length" not in keys
        populate_content_type = b"content-type" not in keys

    body = getattr(self, "body", None)
    if (
        body is not None
        and populate_content_length
        and not (self.status_code < 200 or self.status_code in (204, 304))
    ):
        content_length = str(len(body))
        raw_headers.append((b"content-length", content_length.encode("latin-1")))

    content_type = self.media_type
    if content_type is not None and populate_content_type:
        if content_type.startswith("text/"):
            content_type += "; charset=" + self.charset
        raw_headers.append((b"content-type", content_type.encode("latin-1")))

    self.raw_headers = raw_headers

set_cookie(
    key,
    value="",
    max_age=None,
    expires=None,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

value

TYPE: str DEFAULT: ''

max_age

TYPE: Optional[int] DEFAULT: None

expires

TYPE: Optional[Union[datetime, str, int]] DEFAULT: None

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def set_cookie(
    self,
    key: str,
    value: str = "",
    max_age: typing.Optional[int] = None,
    expires: typing.Optional[typing.Union[datetime, str, int]] = None,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    cookie: "http.cookies.BaseCookie[str]" = http.cookies.SimpleCookie()
    cookie[key] = value
    if max_age is not None:
        cookie[key]["max-age"] = max_age
    if expires is not None:
        if isinstance(expires, datetime):
            cookie[key]["expires"] = format_datetime(expires, usegmt=True)
        else:
            cookie[key]["expires"] = expires
    if path is not None:
        cookie[key]["path"] = path
    if domain is not None:
        cookie[key]["domain"] = domain
    if secure:
        cookie[key]["secure"] = True
    if httponly:
        cookie[key]["httponly"] = True
    if samesite is not None:
        assert samesite.lower() in [
            "strict",
            "lax",
            "none",
        ], "samesite must be either 'strict', 'lax' or 'none'"
        cookie[key]["samesite"] = samesite
    cookie_val = cookie.output(header="").strip()
    self.raw_headers.append((b"set-cookie", cookie_val.encode("latin-1")))

delete_cookie(
    key,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def delete_cookie(
    self,
    key: str,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    self.set_cookie(
        key,
        max_age=0,
        expires=0,
        path=path,
        domain=domain,
        secure=secure,
        httponly=httponly,
        samesite=samesite,
    )

fastapi.responses.Response 

Response(
    content=None,
    status_code=200,
    headers=None,
    media_type=None,
    background=None,
)
PARAMETER DESCRIPTION
content

TYPE: Any DEFAULT: None

status_code

TYPE: int DEFAULT: 200

headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

media_type

TYPE: Optional[str] DEFAULT: None

background

TYPE: Optional[BackgroundTask] DEFAULT: None

Source code in starlette/responses.py 
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def __init__(
    self,
    content: typing.Any = None,
    status_code: int = 200,
    headers: typing.Optional[typing.Mapping[str, str]] = None,
    media_type: typing.Optional[str] = None,
    background: typing.Optional[BackgroundTask] = None,
) -> None:
    self.status_code = status_code
    if media_type is not None:
        self.media_type = media_type
    self.background = background
    self.body = self.render(content)
    self.init_headers(headers)

charset class-attribute instance-attribute 

charset = 'utf-8'

status_code instance-attribute 

status_code = status_code

media_type class-attribute instance-attribute 

media_type = None

body instance-attribute 

body = render(content)

background instance-attribute 

background = background

headers property 

headers

render 

render(content)
PARAMETER DESCRIPTION
content

TYPE: Any

Source code in starlette/responses.py 
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def render(self, content: typing.Any) -> bytes:
    if content is None:
        return b""
    if isinstance(content, bytes):
        return content
    return content.encode(self.charset)  # type: ignore

init_headers 

init_headers(headers=None)
PARAMETER DESCRIPTION
headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

Source code in starlette/responses.py 
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def init_headers(
    self, headers: typing.Optional[typing.Mapping[str, str]] = None
) -> None:
    if headers is None:
        raw_headers: typing.List[typing.Tuple[bytes, bytes]] = []
        populate_content_length = True
        populate_content_type = True
    else:
        raw_headers = [
            (k.lower().encode("latin-1"), v.encode("latin-1"))
            for k, v in headers.items()
        ]
        keys = [h[0] for h in raw_headers]
        populate_content_length = b"content-length" not in keys
        populate_content_type = b"content-type" not in keys

    body = getattr(self, "body", None)
    if (
        body is not None
        and populate_content_length
        and not (self.status_code < 200 or self.status_code in (204, 304))
    ):
        content_length = str(len(body))
        raw_headers.append((b"content-length", content_length.encode("latin-1")))

    content_type = self.media_type
    if content_type is not None and populate_content_type:
        if content_type.startswith("text/"):
            content_type += "; charset=" + self.charset
        raw_headers.append((b"content-type", content_type.encode("latin-1")))

    self.raw_headers = raw_headers

set_cookie(
    key,
    value="",
    max_age=None,
    expires=None,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

value

TYPE: str DEFAULT: ''

max_age

TYPE: Optional[int] DEFAULT: None

expires

TYPE: Optional[Union[datetime, str, int]] DEFAULT: None

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def set_cookie(
    self,
    key: str,
    value: str = "",
    max_age: typing.Optional[int] = None,
    expires: typing.Optional[typing.Union[datetime, str, int]] = None,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    cookie: "http.cookies.BaseCookie[str]" = http.cookies.SimpleCookie()
    cookie[key] = value
    if max_age is not None:
        cookie[key]["max-age"] = max_age
    if expires is not None:
        if isinstance(expires, datetime):
            cookie[key]["expires"] = format_datetime(expires, usegmt=True)
        else:
            cookie[key]["expires"] = expires
    if path is not None:
        cookie[key]["path"] = path
    if domain is not None:
        cookie[key]["domain"] = domain
    if secure:
        cookie[key]["secure"] = True
    if httponly:
        cookie[key]["httponly"] = True
    if samesite is not None:
        assert samesite.lower() in [
            "strict",
            "lax",
            "none",
        ], "samesite must be either 'strict', 'lax' or 'none'"
        cookie[key]["samesite"] = samesite
    cookie_val = cookie.output(header="").strip()
    self.raw_headers.append((b"set-cookie", cookie_val.encode("latin-1")))

delete_cookie(
    key,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def delete_cookie(
    self,
    key: str,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    self.set_cookie(
        key,
        max_age=0,
        expires=0,
        path=path,
        domain=domain,
        secure=secure,
        httponly=httponly,
        samesite=samesite,
    )

fastapi.responses.StreamingResponse 

StreamingResponse(
    content,
    status_code=200,
    headers=None,
    media_type=None,
    background=None,
)

Bases: Response

PARAMETER DESCRIPTION
content

TYPE: ContentStream

status_code

TYPE: int DEFAULT: 200

headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

media_type

TYPE: Optional[str] DEFAULT: None

background

TYPE: Optional[BackgroundTask] DEFAULT: None

Source code in starlette/responses.py 
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def __init__(
    self,
    content: ContentStream,
    status_code: int = 200,
    headers: typing.Optional[typing.Mapping[str, str]] = None,
    media_type: typing.Optional[str] = None,
    background: typing.Optional[BackgroundTask] = None,
) -> None:
    if isinstance(content, typing.AsyncIterable):
        self.body_iterator = content
    else:
        self.body_iterator = iterate_in_threadpool(content)
    self.status_code = status_code
    self.media_type = self.media_type if media_type is None else media_type
    self.background = background
    self.init_headers(headers)

body_iterator instance-attribute 

body_iterator

charset class-attribute instance-attribute 

charset = 'utf-8'

status_code instance-attribute 

status_code = status_code

media_type instance-attribute 

media_type = (
    media_type if media_type is None else media_type
)

body instance-attribute 

body = render(content)

background instance-attribute 

background = background

headers property 

headers

render 

render(content)
PARAMETER DESCRIPTION
content

TYPE: Any

Source code in starlette/responses.py 
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def render(self, content: typing.Any) -> bytes:
    if content is None:
        return b""
    if isinstance(content, bytes):
        return content
    return content.encode(self.charset)  # type: ignore

init_headers 

init_headers(headers=None)
PARAMETER DESCRIPTION
headers

TYPE: Optional[Mapping[str, str]] DEFAULT: None

Source code in starlette/responses.py 
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def init_headers(
    self, headers: typing.Optional[typing.Mapping[str, str]] = None
) -> None:
    if headers is None:
        raw_headers: typing.List[typing.Tuple[bytes, bytes]] = []
        populate_content_length = True
        populate_content_type = True
    else:
        raw_headers = [
            (k.lower().encode("latin-1"), v.encode("latin-1"))
            for k, v in headers.items()
        ]
        keys = [h[0] for h in raw_headers]
        populate_content_length = b"content-length" not in keys
        populate_content_type = b"content-type" not in keys

    body = getattr(self, "body", None)
    if (
        body is not None
        and populate_content_length
        and not (self.status_code < 200 or self.status_code in (204, 304))
    ):
        content_length = str(len(body))
        raw_headers.append((b"content-length", content_length.encode("latin-1")))

    content_type = self.media_type
    if content_type is not None and populate_content_type:
        if content_type.startswith("text/"):
            content_type += "; charset=" + self.charset
        raw_headers.append((b"content-type", content_type.encode("latin-1")))

    self.raw_headers = raw_headers

set_cookie(
    key,
    value="",
    max_age=None,
    expires=None,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

value

TYPE: str DEFAULT: ''

max_age

TYPE: Optional[int] DEFAULT: None

expires

TYPE: Optional[Union[datetime, str, int]] DEFAULT: None

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def set_cookie(
    self,
    key: str,
    value: str = "",
    max_age: typing.Optional[int] = None,
    expires: typing.Optional[typing.Union[datetime, str, int]] = None,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    cookie: "http.cookies.BaseCookie[str]" = http.cookies.SimpleCookie()
    cookie[key] = value
    if max_age is not None:
        cookie[key]["max-age"] = max_age
    if expires is not None:
        if isinstance(expires, datetime):
            cookie[key]["expires"] = format_datetime(expires, usegmt=True)
        else:
            cookie[key]["expires"] = expires
    if path is not None:
        cookie[key]["path"] = path
    if domain is not None:
        cookie[key]["domain"] = domain
    if secure:
        cookie[key]["secure"] = True
    if httponly:
        cookie[key]["httponly"] = True
    if samesite is not None:
        assert samesite.lower() in [
            "strict",
            "lax",
            "none",
        ], "samesite must be either 'strict', 'lax' or 'none'"
        cookie[key]["samesite"] = samesite
    cookie_val = cookie.output(header="").strip()
    self.raw_headers.append((b"set-cookie", cookie_val.encode("latin-1")))

delete_cookie(
    key,
    path="/",
    domain=None,
    secure=False,
    httponly=False,
    samesite="lax",
)
PARAMETER DESCRIPTION
key

TYPE: str

path

TYPE: str DEFAULT: '/'

domain

TYPE: Optional[str] DEFAULT: None

secure

TYPE: bool DEFAULT: False

httponly

TYPE: bool DEFAULT: False

samesite

TYPE: Optional[Literal['lax', 'strict', 'none']] DEFAULT: 'lax'

Source code in starlette/responses.py 
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def delete_cookie(
    self,
    key: str,
    path: str = "/",
    domain: typing.Optional[str] = None,
    secure: bool = False,
    httponly: bool = False,
    samesite: typing.Optional[typing.Literal["lax", "strict", "none"]] = "lax",
) -> None:
    self.set_cookie(
        key,
        max_age=0,
        expires=0,
        path=path,
        domain=domain,
        secure=secure,
        httponly=httponly,
        samesite=samesite,
    )