style: format code consistently and manage headers correctly in flask-app.py

flask-app.py

@@ -14,14 +14,17 @@ def proxy(path):
     resp = requests.request(
         method=request.method,
         url=url,
-        headers={key: value for (key, value) in request.headers if key != 'Host'},
-        data=request.get_data(),
-        cookies=request.cookies,
-        allow_redirects=False)
+            headers={key: value for (key, value) in request.headers if key != 'Host'},
+            data=request.get_data(),
+            cookies=request.cookies,
+            allow_redirects=False
+        )
     
     excluded_headers = ['content-encoding', 'content-length', 'transfer-encoding', 'connection']
-    headers = [(name, value) for (name, value) in resp.raw.headers.items()
-               if name.lower() not in excluded_headers]
+    headers = [
+        (name, value) for (name, value) in resp.raw.headers.items()
+        if name.lower() not in excluded_headers
+    ]
     
     response = app.response_class(
         response=resp.content,