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Exceptions

HTTPError (Exception)

The exception to end the request handling and return an JSON error response.

Examples:

from apiflask import APIFlask, HTTPError
from flask import escape

app = APIFlask(__name__)

@app.get('/<name>')
def hello(name):
    if name == 'Foo':
        raise HTTPError(404, 'This man is missing.')
    return f'Hello, escape{name}'!
Source code in apiflask/exceptions.py
class HTTPError(Exception):
    """The exception to end the request handling and return an JSON error response.

    Examples:

    ```python
    from apiflask import APIFlask, HTTPError
    from flask import escape

    app = APIFlask(__name__)

    @app.get('/<name>')
    def hello(name):
        if name == 'Foo':
            raise HTTPError(404, 'This man is missing.')
        return f'Hello, escape{name}'!
    ```
    """
    status_code: int = 500
    message: t.Optional[str] = None
    detail: t.Any = {}
    headers: ResponseHeaderType = {}
    extra_data: t.Mapping[str, t.Any] = {}

    def __init__(
        self,
        status_code: t.Optional[int] = None,
        message: t.Optional[str] = None,
        detail: t.Optional[t.Any] = None,
        headers: t.Optional[ResponseHeaderType] = None,
        extra_data: t.Optional[t.Mapping[str, t.Any]] = None
    ) -> None:
        """Initialize the error response.

        Arguments:
            status_code: The status code of the error (4XX and 5xx), defaults to 500.
            message: The simple description of the error. If not provided,
                the reason phrase of the status code will be used.
            detail: The detailed information of the error, you can use it to
                provide the addition information such as custom error code,
                documentation URL, etc.
            headers: A dict of headers used in the error response.
            extra_data: A dict of additioinal fields (custom error information) that will
                added to the error response body.

        *Version changed: 0.9.0*

        - Set `detail` and `headers` to empty dict if not set.

        *Version changed: 0.10.0*

        - Add `extra_data` parameter to accept additional error information.

        *Version changed: 0.11.0*

        - Change `status_code` from position argument to keyword argument, defaults to 500.
          Add class attributes with default values to support error subclasses.
        """
        super().__init__()
        if status_code is not None:
            # TODO: support use custom error status code?
            if status_code not in default_exceptions:
                raise LookupError(
                    f'No exception for status code "{status_code}",'
                    ' valid error status code are "4XX" and "5XX".'
                )
            self.status_code = status_code
        if detail is not None:
            self.detail = detail
        if headers is not None:
            self.headers = headers
        if message is not None:
            self.message = message
        if extra_data is not None:
            self.extra_data = extra_data

        if self.message is None:
            # make sure the error message is not empty
            self.message: str = get_reason_phrase(self.status_code, 'Unknown error')

__init__(self, status_code=None, message=None, detail=None, headers=None, extra_data=None) special

Initialize the error response.

Parameters:

Name Type Description Default
status_code Optional[int]

The status code of the error (4XX and 5xx), defaults to 500.

None
message Optional[str]

The simple description of the error. If not provided, the reason phrase of the status code will be used.

None
detail Optional[Any]

The detailed information of the error, you can use it to provide the addition information such as custom error code, documentation URL, etc.

None
headers Union[Dict[str, Union[str, List[str], Tuple[str, ...]]], Mapping[str, Union[str, List[str], Tuple[str, ...]]], List[Tuple[str, Union[str, List[str], Tuple[str, ...]]]], Headers]

A dict of headers used in the error response.

None
extra_data Optional[Mapping[str, Any]]

A dict of additioinal fields (custom error information) that will added to the error response body.

None

Version changed: 0.9.0

  • Set detail and headers to empty dict if not set.

Version changed: 0.10.0

  • Add extra_data parameter to accept additional error information.

Version changed: 0.11.0

  • Change status_code from position argument to keyword argument, defaults to 500. Add class attributes with default values to support error subclasses.
Source code in apiflask/exceptions.py
def __init__(
    self,
    status_code: t.Optional[int] = None,
    message: t.Optional[str] = None,
    detail: t.Optional[t.Any] = None,
    headers: t.Optional[ResponseHeaderType] = None,
    extra_data: t.Optional[t.Mapping[str, t.Any]] = None
) -> None:
    """Initialize the error response.

    Arguments:
        status_code: The status code of the error (4XX and 5xx), defaults to 500.
        message: The simple description of the error. If not provided,
            the reason phrase of the status code will be used.
        detail: The detailed information of the error, you can use it to
            provide the addition information such as custom error code,
            documentation URL, etc.
        headers: A dict of headers used in the error response.
        extra_data: A dict of additioinal fields (custom error information) that will
            added to the error response body.

    *Version changed: 0.9.0*

    - Set `detail` and `headers` to empty dict if not set.

    *Version changed: 0.10.0*

    - Add `extra_data` parameter to accept additional error information.

    *Version changed: 0.11.0*

    - Change `status_code` from position argument to keyword argument, defaults to 500.
      Add class attributes with default values to support error subclasses.
    """
    super().__init__()
    if status_code is not None:
        # TODO: support use custom error status code?
        if status_code not in default_exceptions:
            raise LookupError(
                f'No exception for status code "{status_code}",'
                ' valid error status code are "4XX" and "5XX".'
            )
        self.status_code = status_code
    if detail is not None:
        self.detail = detail
    if headers is not None:
        self.headers = headers
    if message is not None:
        self.message = message
    if extra_data is not None:
        self.extra_data = extra_data

    if self.message is None:
        # make sure the error message is not empty
        self.message: str = get_reason_phrase(self.status_code, 'Unknown error')

abort(status_code, message=None, detail=None, headers=None, extra_data=None)

A function to raise HTTPError exception.

Similar to Flask's abort, but returns a JSON response.

Examples:

from apiflask import APIFlask, abort
from flask import escape

app = APIFlask(__name__)

@app.get('/<name>')
def hello(name):
    if name == 'Foo':
        abort(404, 'This man is missing.')
        # or just `abort(404)`
    return f'Hello, escape{name}'!

P.S. When app.json_errors is True (default), Flask's flask.abort will also return JSON error response.

Parameters:

Name Type Description Default
status_code int

The status code of the error (4XX and 5xx).

required
message Optional[str]

The simple description of the error. If not provided, the reason phrase of the status code will be used.

None
detail Optional[Any]

The detailed information of the error, you can use it to provide the addition information such as custom error code, documentation URL, etc.

None
headers Union[Dict[str, Union[str, List[str], Tuple[str, ...]]], Mapping[str, Union[str, List[str], Tuple[str, ...]]], List[Tuple[str, Union[str, List[str], Tuple[str, ...]]]], Headers]

A dict of headers used in the error response.

None
extra_data Optional[dict]

A dict of additioinal fields (custom error information) that will added to the error response body.

None

Version changed: 0.4.0

  • Rename the function name from abort_json to abort.

Version changed: 0.10.0

  • Add new parameter extra_data.
Source code in apiflask/exceptions.py
def abort(
    status_code: int,
    message: t.Optional[str] = None,
    detail: t.Optional[t.Any] = None,
    headers: t.Optional[ResponseHeaderType] = None,
    extra_data: t.Optional[dict] = None
) -> None:
    """A function to raise HTTPError exception.

    Similar to Flask's `abort`, but returns a JSON response.

    Examples:

    ```python
    from apiflask import APIFlask, abort
    from flask import escape

    app = APIFlask(__name__)

    @app.get('/<name>')
    def hello(name):
        if name == 'Foo':
            abort(404, 'This man is missing.')
            # or just `abort(404)`
        return f'Hello, escape{name}'!
    ```

    P.S. When `app.json_errors` is `True` (default), Flask's `flask.abort` will also
    return JSON error response.

    Arguments:
        status_code: The status code of the error (4XX and 5xx).
        message: The simple description of the error. If not provided,
            the reason phrase of the status code will be used.
        detail: The detailed information of the error, you can use it to
            provide the addition information such as custom error code,
            documentation URL, etc.
        headers: A dict of headers used in the error response.
        extra_data: A dict of additioinal fields (custom error information) that will
            added to the error response body.

    *Version changed: 0.4.0*

    - Rename the function name from `abort_json` to `abort`.

    *Version changed: 0.10.0*

    - Add new parameter `extra_data`.
    """
    raise HTTPError(status_code, message, detail, headers, extra_data)