### 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)

self, exception: BaseException, task: BaseOperator | None = None
    ) -> tuple[str, str, str]:
        """Get the email subject content for exceptions."""
        
        if task is None:
            task = getattr(self, "task")
        use_default = task is None
        exception_html = str(exception).replace("\n", "<br>")
        default_subject = "Airflow alert: {{ti}}"
        
        
        
        default_html_content = (
            "Try {{try_number}} out of {{max_tries + 1}}<br>"
            "Exception:<br>{{exception_html}}<br>"
            'Log: <a href="{{ti.log_url}}">Link</a><br>'
            "Host: {{ti.hostname}}<br>"
            'Mark success: <a href="{{ti.mark_success_url}}">Link</a><br>'
        )
        default_html_content_err = (
            "Try {{try_number}} out of {{max_tries + 1}}<br>"
            "Exception:<br>Failed attempt to attach error logs<br>"
            'Log: <a href="{{ti.log_url}}">Link</a><br>'
            "Host: {{ti.hostname}}<br>"
            'Mark success: <a href="{{ti.mark_success_url}}">Link</a><br>'