### Apache Airflow version

2.5.1

### What happened

/calendar page give a problem, here is the capture



![屏幕截图 2023-01-30 093116](https://user-images.githubusercontent.com/19165258/215369479-9fc7de5c-f190-460c-9cf7-9ab27d8ac355.png)


### What you think should happen instead

_No response_

### How to reproduce

_No response_

### Operating System

Ubuntu 22.04.1 LTS

### Versions of Apache Airflow Providers

Distributor ID: Ubuntu
Description:    Ubuntu 22.04.1 LTS
Release:        22.04
Codename:       jammy

### Deployment

Other

### Deployment details


Distributor ID: Ubuntu
Description:    Ubuntu 22.04.1 LTS
Release:        22.04
Codename:       jammy

### Anything else

_No response_

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [x] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

"""Show Method Not Allowed on screen for any error in the Webserver"""
    return (
        render_template(
            "airflow/error.html",
            hostname=get_hostname()
            if conf.getboolean("webserver", "EXPOSE_HOSTNAME", fallback=True)
            else "redact",
            status_code=405,
            error_message="Received an invalid request.",
        ),
        405,
    )
def show_traceback(error):
    """Show Traceback for a given error"""
    return (
        render_template(
            "airflow/traceback.html",
            python_version=sys.version.split(" ")[0] if g.user.is_authenticated else "redact",
            airflow_version=version if g.user.is_authenticated else "redact",
            hostname=get_hostname()
            if conf.getboolean("webserver", "EXPOSE_HOSTNAME", fallback=True) and g.user.is_authenticated
            else "redact",
            info=traceback.format_exc()
            if conf.getboolean("webserver", "EXPOSE_STACKTRACE", fallback=True) and g.user.is_authenticated
            else "Error! Please contact server admin.",
        ),
        500,
    )
class AirflowBaseView(BaseView):