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+
+nginx handles mtls, and allows connection to local gunicorn instance. If mTLS fails, connection fails and event is logged
+
+
+    ubuntu
+sudo pip install Flask gunicorn  # to install for all users, especially www-data so that the service runs
+  nginx
+install nginx
+sudo systemctl enable --now nginx
+  # cat /var/log/nginx/access.log
+  # /etc/nginx/nginx.conf
+  gunicorn
+gunicorn --bind localhost:5000 app:app           # for testing
+sudo nano /etc/systemd/system/gunicorn1.service  # as a service
+sudo systemctl enable --now gunicorn1            # as a service
+  python
+app1.py
+sudo mkdir /var/www
+sudo chown -R www-data:www-data /var/www
+sudo cp app1.py /var/www
+
+
+  test
+# private key
+openssl genrsa -out ca.key 2048
+# public certificate
+openssl req -x509 -new -nodes -key ca.key -sha256 -days 1024 -out ca.pem -subj "/C=US/ST=YourState/L=YourCity/O=YourOrg/CN=YourCA"
+
+# server private key
+openssl genrsa -out server.key 2048
+# generate certificate signing request
+openssl req -new -key server.key -out server.csr -subj "/C=US/ST=YourState/L=YourCity/O=YourOrg/CN=localhost"
+# use public and private key of the ca to sign the cert signing request
+openssl x509 -req -in server.csr -CA ca.pem -CAkey ca.key -CAcreateserial -out server.crt -days 365 -sha256
+
+openssl genrsa -out client.key 2048
+openssl req -new -key client.key -out client.csr -subj "/C=US/ST=YourState/L=YourCity/O=YourOrg/CN=client"
+openssl x509 -req -in client.csr -CA ca.pem -CAkey ca.key -CAcreateserial -out client.crt -days 365 -sha256
+
+openssl genrsa -out wrong_client.key 2048
+openssl req -new -x509 -key wrong_client.key -out wrong_client.crt -days 365 -subj "/C=US/ST=State/L=City/O=Organization/CN=incorrectclient"
+
+curl https://127.0.0.1 --cacert ca.pem --cert wrong_client.crt --key wrong_client.key -k
+curl https://127.0.0.1 --cacert ca.pem --cert client.crt --key client.key -k
+
+
+  untested
+sudo cp /path/to/ca.pem /usr/local/share/ca-certificates/your-ca.crt
+sudo update-ca-certificates
+  nginx configuration
+    ocsp server to check that the server is valid
+    crl to check if a client is revoked
+server {
+    listen 443 ssl;
+    server_name yourdomain.com;
+
+    ssl_certificate /path/to/your/server.crt;
+    ssl_certificate_key /path/to/your/server.key;
+
+    # Client certificate verification
+    ssl_client_certificate /path/to/your/ca.pem;
+    ssl_verify_client on;
+
+    # Enable OCSP stapling and strict verification
+    ssl_stapling on;
+    ssl_stapling_verify on;
+    ssl_trusted_certificate /path/to/your/ca.pem;
+
+    # Specify resolver for OCSP stapling
+    resolver 8.8.8.8 8.8.4.4 valid=300s;
+    resolver_timeout 10s;
+
+    # Enforce OCSP response checking strictly
+    ssl_ocsp on;
+    ssl_ocsp_fail closed;
+
+    # Specify CRL file for client certificate revocation checking
+    ssl_crl /etc/nginx/ssl/crl.pem;
+
+    location / {
+        try_files $uri $uri/ =404;
+    }
+}
+