diff --git a/Dockerfile b/Dockerfile
index 04a7411..0169720 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,6 @@
 ARG python_version=3.9.18
 FROM python:${python_version}-slim-bullseye AS build
 
-WORKDIR /src
-
 COPY requirements.txt /tmp/requirements.txt
 
 RUN apt-get update && \
diff --git a/src/controller.py b/src/controller.py
index aa35422..c541134 100644
--- a/src/controller.py
+++ b/src/controller.py
@@ -6,7 +6,7 @@
 from apple import verify_attestation_statement
 from goog import verify_integrity_token
 
-app = Flask(__name__)
+server = Flask(__name__)
 
 nonce = secrets.token_hex(16)
 
@@ -97,7 +97,7 @@ def decode_base64_to_json(s):
 
     return json_obj
 
-@app.route('/topic/basicmessages/', methods=['POST'])
+@server.route('/topic/basicmessages/', methods=['POST'])
 def basicmessages():
     print("Run POST /topic/basicmessages/")
     message = request.get_json()
@@ -110,7 +110,7 @@ def basicmessages():
 
     return make_response('', 204)
 
-@app.route('/topic/connections/', methods=['POST'])
+@server.route('/topic/connections/', methods=['POST'])
 def connections():
     print("Run POST /topic/connections/")
 
@@ -122,6 +122,5 @@ def connections():
 
     return make_response('', 204)
 
-
 if __name__ == '__main__':
-    app.run(debug=True)
+    server.run(debug=True)