### Apache Airflow version

Other Airflow 2 version (please specify below)

### What happened

```
$ curl localhost:8080/airflow/
<!doctype html>
<html lang=en>
<title>Redirecting...</title>
<h1>Redirecting...</h1>
<p>You should be redirected automatically to the target URL: <a href="http://localhost:8080/airflow/">http://localhost:8080/airflow/</a>. If not, click the link.
```

### What you think should happen instead

At least not circular redirect.

### How to reproduce

generate yaml:

```
helm template --name-template=airflow  ~/downloads/airflow > airflow.yaml
```

add base_url in webserver section and remove health and ready check in webserver(to keep pod alive):
```
    [webserver]
    enable_proxy_fix = True
    rbac = True
    base_url = http://my.domain.com/airflow/
```

### Operating System

Ubuntu 22.04.2 LTS

### Versions of Apache Airflow Providers

apache-airflow==2.5.3
apache-airflow-providers-amazon==7.3.0
apache-airflow-providers-celery==3.1.0
apache-airflow-providers-cncf-kubernetes==5.2.2
apache-airflow-providers-common-sql==1.3.4
apache-airflow-providers-docker==3.5.1
apache-airflow-providers-elasticsearch==4.4.0
apache-airflow-providers-ftp==3.3.1
apache-airflow-providers-google==8.11.0
apache-airflow-providers-grpc==3.1.0
apache-airflow-providers-hashicorp==3.3.0
apache-airflow-providers-http==4.2.0
apache-airflow-providers-imap==3.1.1
apache-airflow-providers-microsoft-azure==5.2.1
apache-airflow-providers-mysql==4.0.2
apache-airflow-providers-odbc==3.2.1
apache-airflow-providers-postgres==5.4.0
apache-airflow-providers-redis==3.1.0
apache-airflow-providers-sendgrid==3.1.0
apache-airflow-providers-sftp==4.2.4
apache-airflow-providers-slack==7.2.0
apache-airflow-providers-snowflake==4.0.4
apache-airflow-providers-sqlite==3.3.1
apache-airflow-providers-ssh==3.5.0

### Deployment

Official Apache Airflow Helm Chart

### Deployment details

_No response_

### 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)

if conf.has_option("email", key):
                    path = conf.get_mandatory_value("email", key)
                    try:
                        with open(path) as f:
                            content = f.read()
                    except FileNotFoundError:
                        self.log.warning(f"Could not find email template file '{path!r}'. Using defaults...")
                    except OSError:
                        self.log.exception(f"Error while using email template '{path!r}'. Using defaults...")
                return render_template_to_string(jinja_env.from_string(content), jinja_context)
            subject = render("subject_template", default_subject)
            html_content = render("html_content_template", default_html_content)
            html_content_err = render("html_content_template", default_html_content_err)
        return subject, html_content, html_content_err
    def email_alert(self, exception, task: BaseOperator) -> None:
        """Send alert email with exception information."""
        subject, html_content, html_content_err = self.get_email_subject_content(exception, task=task)
        assert task.email
        try:
            send_email(task.email, subject, html_content)
        except Exception:
            send_email(task.email, subject, html_content_err)
    def set_duration(self) -> None:
        """Set TI duration."""
        if self.end_date and self.start_date:
            self.duration = (self.end_date - self.start_date).total_seconds()
        else:
            self.duration = None
        self.log.debug("Task Duration set to %s", self.duration)
    def _record_task_map_for_downstreams(self, task: Operator, value: Any, *, session: Session) -> None: