Add week 3 materials

materials/03-http/seminar/website/kittens/app.py

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+from flask import Flask, render_template, request
+
+import logging
+import os
+import requests
+
+app = Flask(__name__)
+app.logger.setLevel(logging.INFO)
+
+APP_VERSION = os.getenv('APP_VERSION')
+BIND_HOST = os.getenv('BIND_HOST') or '0.0.0.0'
+BIND_PORT = os.getenv('BIND_PORT') or '8000'
+
+
+@app.before_request
+def log_request():
+    app.logger.info(
+        'method=%s path=%s host=%s remote_addr=%s',
+        request.method, request.path, request.host, request.remote_addr,
+    )
+
+
+@app.route('/')
+def home():
+    return f'Hello from app {APP_VERSION}'
+
+
+@app.route('/kittens')
+def kittens():
+    # Get a URL to a random kitten photo.
+    response = requests.get('https://api.thecatapi.com/v1/images/search?api_')
+
+    try:
+        # Response structure is as follows:
+        # [{"id":"bL3lrUi1A","url":"ex.com/bL3lrUi1A.jpg","width":1280,"height":720}]
+        data = response.json()
+        kitten_url = data[0]['url']
+
+        return render_template('index.html', kitten_url=kitten_url)
+    except Exception as e:
+        return f'Failed to fetch a kitten image :(\n {e}'
+
+
+if __name__ == '__main__':
+    app.run(host=BIND_HOST, port=BIND_PORT)