diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b5c59b9a..4cb15e01 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -26,6 +26,7 @@ trigger_build_on_openshift:
     script:
         - curl -X POST -k https://openshift.cern.ch:443/apis/build.openshift.io/v1/namespaces/cara/buildconfigs/cara-app/webhooks/${OPENSHIFT_BUILD_WEBHOOK_SECRET}/generic
         - curl -X POST -k https://openshift.cern.ch:443/apis/build.openshift.io/v1/namespaces/cara/buildconfigs/cara-router/webhooks/${OPENSHIFT_BUILD_WEBHOOK_SECRET}/generic
+        - curl -X POST -k https://openshift.cern.ch:443/apis/build.openshift.io/v1/namespaces/cara/buildconfigs/cara-webservice/webhooks/${OPENSHIFT_BUILD_WEBHOOK_SECRET}/generic
 
 
 deploy_to_test:
@@ -39,3 +40,4 @@ deploy_to_test:
     script:
         - curl -X POST -k https://openshift-dev.cern.ch:443/apis/build.openshift.io/v1/namespaces/test-cara/buildconfigs/cara-app/webhooks/${OPENSHIFT_TEST_BUILD_WEBHOOK_SECRET}/generic
         - curl -X POST -k https://openshift-dev.cern.ch:443/apis/build.openshift.io/v1/namespaces/test-cara/buildconfigs/cara-router/webhooks/${OPENSHIFT_TEST_BUILD_WEBHOOK_SECRET}/generic
+        - curl -X POST -k https://openshift-dev.cern.ch:443/apis/build.openshift.io/v1/namespaces/test-cara/buildconfigs/cara-webservice/webhooks/${OPENSHIFT_TEST_BUILD_WEBHOOK_SECRET}/generic
diff --git a/README.md b/README.md
index 63b6856c..5a1e2124 100644
--- a/README.md
+++ b/README.md
@@ -22,8 +22,9 @@ Then visit http://localhost:8080/calculator.
 **Simulate the docker build that takes place on openshift with:**
 
 ```
-s2i build file://$(pwd) --copy --context-dir=app-config/nginx/ centos/nginx-112-centos7 cara-nginx-app
-s2i build file://$(pwd) --copy --context-dir=./ centos/python-36-centos7 cara-voila-app
+s2i build file://$(pwd) --copy --keep-symlinks --context-dir ./app-config/nginx/ centos/nginx-112-centos7 cara-nginx-app
+s2i build file://$(pwd) --copy --keep-symlinks --env APP_NAME=cara-voila --context-dir ./ centos/python-36-centos7 cara-voila-app
+s2i build file://$(pwd) --copy --keep-symlinks --env APP_NAME=cara-webservice --context-dir ./  centos/python-36-centos7 cara-webservice
 cd app-config
 docker-compose up
 ```
diff --git a/app-config/docker-compose.yml b/app-config/docker-compose.yml
index 917660ea..2f387b61 100644
--- a/app-config/docker-compose.yml
+++ b/app-config/docker-compose.yml
@@ -8,4 +8,5 @@ services:
     image: cara-nginx-app
     ports:
         - "8080:8080"
-
+  cara-webservice:
+    image: cara-webservice
diff --git a/app-config/nginx/nginx.conf b/app-config/nginx/nginx.conf
index d799ebf3..fad1422c 100644
--- a/app-config/nginx/nginx.conf
+++ b/app-config/nginx/nginx.conf
@@ -70,5 +70,20 @@ http {
         # Redirect this (and all other) URLs to the new scheme.
         absolute_redirect off;
         rewrite ^/voila/(.*)$ /voila-server/voila/$1 redirect;
+
+        location /calculator/ {
+                # cara-webservice is the name of the tornado server (for the calculator)
+                # in each of docker-compose, test-cara.web.cern.ch and cara.web.cern.ch.
+                proxy_pass http://cara-webservice:8080/calculator/;
+
+                proxy_set_header Host $host;
+                proxy_set_header X-Real-IP $remote_addr;
+                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+
+                proxy_http_version 1.1;
+                proxy_set_header Upgrade $http_upgrade;
+                proxy_set_header Connection "upgrade";
+                proxy_read_timeout 86400;
+        }
     }
 }
\ No newline at end of file
diff --git a/app.sh b/app.sh
index e23f5afe..000fe79d 100755
--- a/app.sh
+++ b/app.sh
@@ -1,2 +1,9 @@
-voila app/ --port=8080 --no-browser --base_url=/voila-server/ --Voila.tornado_settings="{'allow_origin': '*'}"
+env
+if [[ "$APP_NAME" == "cara-webservice" ]]; then
+    echo "Starting the cara webservice"
+    python -m cara.apps.calculator
+elif [[ "$APP_NAME" == "cara-voila" ]]; then
+    echo "Starting the voila service"
+    voila app/ --port=8080 --no-browser --base_url=/voila-server/ --Voila.tornado_settings="{'allow_origin': '*'}"
+fi
 
diff --git a/cara/apps/calculator/__init__.py b/cara/apps/calculator/__init__.py
index e64278ea..a8919b13 100644
--- a/cara/apps/calculator/__init__.py
+++ b/cara/apps/calculator/__init__.py
@@ -56,7 +56,7 @@ def make_app(debug=False, prefix='/calculator'):
     static_dir = Path(__file__).absolute().parent / 'static'
     urls = [
         (
-            prefix + r'()', StaticFileHandler, {'path': static_dir / 'form.html'}
+            prefix + r'/?()', StaticFileHandler, {'path': static_dir / 'form.html'}
         ),
         (
             prefix + r'/report', ConcentrationModel