With NGINX configured, the airflow web redirect to home page instead of the specific Dag Page after clear.

[yogyang]

After clearing the airflow task/dag (Or marking Failed/Success), the airflow web redirect to the home page instead of the specific Dag Page.
Starting from Airflow 1.10.14.

web server log:

[turbaszek]

@yogyang if you think this is a bug please consider creating an bug report:
https://github.com/apache/airflow/issues/new/choose

[yogyang]

It's not a bug, just a production Nginx config problem, will update the answer right now.
just write it in case someone will meet this later. It cost me two days to figure it out.

[yogyang]

Just create the question in case someone will meet it again.
Cause:
From Airflow 1.10.14, Airflow introduced new codes for redirection location.

airflow/airflow/www/views.py

Lines 122 to 136 in 5bfa0f1

	def get_safe_url(url):
	"""Given a user-supplied URL, ensure it points to our web server"""
	valid_schemes = ['http', 'https', '']
	valid_netlocs = [request.host, '']
	if not url:
	return url_for('Airflow.index')
	parsed = urlparse(url)
	query = parse_qsl(parsed.query, keep_blank_values=True)
	url = parsed._replace(query=urlencode(query)).geturl()
	if parsed.scheme in valid_schemes and parsed.netloc in valid_netlocs:
	return url

And when set up with NGINX, by default, NGINX rewrites the host to $proxy-host, making the request.host does not match with input URL parsed netloc`

Fix:
Add proxy_set_header Host $host; in NGINX config.

Refer:
https://docs.nginx.com/nginx/admin-guide/web-server/reverse-proxy/#passing-request-headers

[springuper]

I'd strongly recommend we add logging.warning(...) before

airflow/airflow/www/views.py

Line 138 in 5bfa0f1

return url_for('Airflow.index')

to explicitly notice developers to know the redirection reason.