# Exceptions - `HTTPException` and `WebSocketException`

These are the exceptions that you can raise to show errors to the client.

When you raise an exception, as would happen with normal Python, the rest of the execution is aborted. This way you can raise these exceptions from anywhere in the code to abort a request and show the error to the client.

You can use:

* `HTTPException`
* `WebSocketException`

        if username is None:
            raise credentials_exception
        token_scopes = payload.get("scopes", [])
        token_data = TokenData(scopes=token_scopes, username=username)
    except (JWTError, ValidationError):
        raise credentials_exception
    user = get_user(fake_users_db, username=token_data.username)
    if user is None:
        raise credentials_exception
    for scope in security_scopes.scopes:

        if username is None:
            raise credentials_exception
        token_scopes = payload.get("scopes", [])
        token_data = TokenData(scopes=token_scopes, username=username)
    except (JWTError, ValidationError):
        raise credentials_exception
    user = get_user(fake_users_db, username=token_data.username)
    if user is None:
        raise credentials_exception
    for scope in security_scopes.scopes:

        if username is None:
            raise credentials_exception
        token_scopes = payload.get("scopes", [])
        token_data = TokenData(scopes=token_scopes, username=username)
    except (JWTError, ValidationError):
        raise credentials_exception
    user = get_user(fake_users_db, username=token_data.username)
    if user is None:
        raise credentials_exception
    for scope in security_scopes.scopes:

    public DataStoreException(final String message, final Throwable cause) {
        super(message, cause);
    }

    public DataStoreException(final String message) {
        super(message);
    }

    public DataStoreException(final Throwable cause) {
        super(cause);
    }

    public FessSystemException(final String message, final Throwable cause) {
        super(message, cause);
    }

    public FessSystemException(final String message) {
        super(message);
    }

    public FessSystemException(final Throwable cause) {
        super(cause);
    }

    private static final long serialVersionUID = 1L;

    /**
     * @param message Exception message.
     * @param cause Root cause for this exception.
     */
    public ScheduledJobException(final String message, final Throwable cause) {
        super(message, cause);
    }

    /**
     * @param message Exception message.
     */
    public ScheduledJobException(final String message) {

        username: str = payload.get("sub")
        if username is None:
            raise credentials_exception
        token_data = TokenData(username=username)
    except JWTError:
        raise credentials_exception
    user = get_user(fake_users_db, username=token_data.username)
    if user is None:
        raise credentials_exception
    return user


async def get_current_active_user(

     * {@link SQLRuntimeException}を作成します。
     *
     * @param cause
     *            原因となった例外
     */
    public SQLRuntimeException(final SQLException cause) {
        super("ECL0072", asArray(getSql(cause), getRealMessage(cause), Integer.toString(cause.getErrorCode()), cause.getSQLState()), cause);
    }

    /**
     * <code>SQL</code>を返します。
     *
     * @param cause
     *            原因となった例外
     * @return <code>SQL</code>

    private static final long serialVersionUID = 1L;

    public IllegalBlockSizeRuntimeException(final IllegalBlockSizeException cause) {
        super("ECL0105", new Object[] { cause.getMessage() }, cause);
    }