Solution

Dockerfile

-FROM python:3-slim
+FROM python:3-alpine
 
 WORKDIR /app
 ADD requirements.txt ./
-RUN pip install -r requirements.txt
+RUN pip install -r requirements.txt && \
+    rm requirements.txt
 
 CMD ["python", "-u", "app.py"]
 

app.py

-from flask import Flask, request
+from flask import Flask, request, abort
+import wikipedia
 
 app = Flask(__name__, static_folder="static")
 
 @app.route("/")
 def index():
-    content = request.args.get('proof', default="")
-    return f"""<h1>Hello</h1>
-        I am generated content:
-        <p>{ content }</p>
-        """
+    wiki = request.args.get('wiki', default="Lübeck")
+    try:
+        wikipedia.set_lang("de")
+        content = wikipedia.page(wiki).summary        
+        return f"""<h1>{ wiki }</h1>
+            Ich habe dies auf Wikipedia gefunden:
+            <p>{ content }</p>
+            """
+    except:
+        abort(404, f"{ wiki } not found")
 
-print("Starting ...")
+# print("Starting ...")
 app.run(host="0.0.0.0", port=8080)
\ No newline at end of file

requirements.txt

 flask
-pandas
\ No newline at end of file
+wikipedia
\ No newline at end of file