We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Only prepend www for production website
It should not be used for development website.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `csunplugged/config/settings/production.py`
Content:
```
1 # -*- coding: utf-8 -*-
2 """
3 Django settings for production environment.
4 
5 - Load secret values from environment variables.
6 - Set static URL to Google Cloud Storage Bucket.
7 """
8 
9 from .base import *  # noqa: F403
10 
11 
12 # SECRET CONFIGURATION
13 # ------------------------------------------------------------------------------
14 # See: https://docs.djangoproject.com/en/dev/ref/settings/#secret-key
15 # Raises ImproperlyConfigured exception if DJANGO_SECRET_KEY not in os.environ
16 SECRET_KEY = env("DJANGO_SECRET_KEY")  # noqa: F405
17 
18 # SECURITY WARNING: App Engine"s security features ensure that it is safe to
19 # have ALLOWED_HOSTS = ["*"] when the app is deployed. If you deploy a Django
20 # app not on App Engine, make sure to set an appropriate host here.
21 # See https://docs.djangoproject.com/en/1.10/ref/settings/
22 ALLOWED_HOSTS = ["*"]
23 
24 # URL Configuration
25 # ------------------------------------------------------------------------------
26 PREPEND_WWW = True
27 
28 # DATABASE CONFIGURATION
29 # ----------------------------------------------------------------------------
30 # See: https://docs.djangoproject.com/en/dev/ref/settings/#databases
31 DATABASES = {
32     "default": {
33         "ENGINE": "django.db.backends.postgresql",
34         "NAME": "csunplugged",
35         "USER": env("GOOGLE_CLOUD_SQL_DATABASE_USERNAME"),  # noqa: F405
36         "PASSWORD": env("GOOGLE_CLOUD_SQL_DATABASE_PASSWORD"),  # noqa: F405
37         "HOST": "/cloudsql/" + env("GOOGLE_CLOUD_SQL_CONNECTION_NAME"),  # noqa: F405
38     }
39 }
40 DATABASES["default"]["ATOMIC_REQUESTS"] = True
41 
42 # Static files
43 STATIC_URL = "https://storage.googleapis.com/" + env("GOOGLE_CLOUD_STORAGE_BUCKET_NAME") + "/static/"  # noqa: F405
44 
45 # SECURITY CONFIGURATION
46 # ------------------------------------------------------------------------------
47 # See https://docs.djangoproject.com/en/dev/ref/middleware/#module-django.middleware.security
48 # and https://docs.djangoproject.com/en/dev/howto/deployment/checklist/#run-manage-py-check-deploy
49 
50 # set this to 60 seconds and then to 518400 when you can prove it works
51 SECURE_HSTS_SECONDS = 60
52 SECURE_PROXY_SSL_HEADER = ("HTTP_X_FORWARDED_PROTO", "https")
53 SECURE_HSTS_INCLUDE_SUBDOMAINS = env.bool("DJANGO_SECURE_HSTS_INCLUDE_SUBDOMAINS", default=True)  # noqa: F405
54 SECURE_CONTENT_TYPE_NOSNIFF = env.bool("DJANGO_SECURE_CONTENT_TYPE_NOSNIFF", default=True)  # noqa: F405
55 SECURE_BROWSER_XSS_FILTER = True
56 SESSION_COOKIE_SECURE = True
57 SESSION_COOKIE_HTTPONLY = True
58 SECURE_SSL_REDIRECT = env.bool("DJANGO_SECURE_SSL_REDIRECT", default=True)  # noqa: F405
59 CSRF_COOKIE_SECURE = True
60 CSRF_COOKIE_HTTPONLY = True
61 X_FRAME_OPTIONS = "DENY"
62
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/csunplugged/config/settings/production.py b/csunplugged/config/settings/production.py
--- a/csunplugged/config/settings/production.py
+++ b/csunplugged/config/settings/production.py
@@ -23,7 +23,10 @@
 
 # URL Configuration
 # ------------------------------------------------------------------------------
-PREPEND_WWW = True
+if env("DEPLOYMENT", default=None) == "prod":  # noqa: F405
+    PREPEND_WWW = True
+else:
+    PREPEND_WWW = False
 
 # DATABASE CONFIGURATION
 # ----------------------------------------------------------------------------

{"golden_diff": "diff --git a/csunplugged/config/settings/production.py b/csunplugged/config/settings/production.py\n--- a/csunplugged/config/settings/production.py\n+++ b/csunplugged/config/settings/production.py\n@@ -23,7 +23,10 @@\n \n # URL Configuration\n # ------------------------------------------------------------------------------\n-PREPEND_WWW = True\n+if env(\"DEPLOYMENT\", default=None) == \"prod\":  # noqa: F405\n+    PREPEND_WWW = True\n+else:\n+    PREPEND_WWW = False\n \n # DATABASE CONFIGURATION\n # ----------------------------------------------------------------------------\n", "issue": "Only prepend www for production website\nIt should not be used for development website.\n", "before_files": [{"content": "# -*- coding: utf-8 -*-\n\"\"\"\nDjango settings for production environment.\n\n- Load secret values from environment variables.\n- Set static URL to Google Cloud Storage Bucket.\n\"\"\"\n\nfrom .base import *  # noqa: F403\n\n\n# SECRET CONFIGURATION\n# ------------------------------------------------------------------------------\n# See: https://docs.djangoproject.com/en/dev/ref/settings/#secret-key\n# Raises ImproperlyConfigured exception if DJANGO_SECRET_KEY not in os.environ\nSECRET_KEY = env(\"DJANGO_SECRET_KEY\")  # noqa: F405\n\n# SECURITY WARNING: App Engine\"s security features ensure that it is safe to\n# have ALLOWED_HOSTS = [\"*\"] when the app is deployed. If you deploy a Django\n# app not on App Engine, make sure to set an appropriate host here.\n# See https://docs.djangoproject.com/en/1.10/ref/settings/\nALLOWED_HOSTS = [\"*\"]\n\n# URL Configuration\n# ------------------------------------------------------------------------------\nPREPEND_WWW = True\n\n# DATABASE CONFIGURATION\n# ----------------------------------------------------------------------------\n# See: https://docs.djangoproject.com/en/dev/ref/settings/#databases\nDATABASES = {\n    \"default\": {\n        \"ENGINE\": \"django.db.backends.postgresql\",\n        \"NAME\": \"csunplugged\",\n        \"USER\": env(\"GOOGLE_CLOUD_SQL_DATABASE_USERNAME\"),  # noqa: F405\n        \"PASSWORD\": env(\"GOOGLE_CLOUD_SQL_DATABASE_PASSWORD\"),  # noqa: F405\n        \"HOST\": \"/cloudsql/\" + env(\"GOOGLE_CLOUD_SQL_CONNECTION_NAME\"),  # noqa: F405\n    }\n}\nDATABASES[\"default\"][\"ATOMIC_REQUESTS\"] = True\n\n# Static files\nSTATIC_URL = \"https://storage.googleapis.com/\" + env(\"GOOGLE_CLOUD_STORAGE_BUCKET_NAME\") + \"/static/\"  # noqa: F405\n\n# SECURITY CONFIGURATION\n# ------------------------------------------------------------------------------\n# See https://docs.djangoproject.com/en/dev/ref/middleware/#module-django.middleware.security\n# and https://docs.djangoproject.com/en/dev/howto/deployment/checklist/#run-manage-py-check-deploy\n\n# set this to 60 seconds and then to 518400 when you can prove it works\nSECURE_HSTS_SECONDS = 60\nSECURE_PROXY_SSL_HEADER = (\"HTTP_X_FORWARDED_PROTO\", \"https\")\nSECURE_HSTS_INCLUDE_SUBDOMAINS = env.bool(\"DJANGO_SECURE_HSTS_INCLUDE_SUBDOMAINS\", default=True)  # noqa: F405\nSECURE_CONTENT_TYPE_NOSNIFF = env.bool(\"DJANGO_SECURE_CONTENT_TYPE_NOSNIFF\", default=True)  # noqa: F405\nSECURE_BROWSER_XSS_FILTER = True\nSESSION_COOKIE_SECURE = True\nSESSION_COOKIE_HTTPONLY = True\nSECURE_SSL_REDIRECT = env.bool(\"DJANGO_SECURE_SSL_REDIRECT\", default=True)  # noqa: F405\nCSRF_COOKIE_SECURE = True\nCSRF_COOKIE_HTTPONLY = True\nX_FRAME_OPTIONS = \"DENY\"\n", "path": "csunplugged/config/settings/production.py"}], "after_files": [{"content": "# -*- coding: utf-8 -*-\n\"\"\"\nDjango settings for production environment.\n\n- Load secret values from environment variables.\n- Set static URL to Google Cloud Storage Bucket.\n\"\"\"\n\nfrom .base import *  # noqa: F403\n\n\n# SECRET CONFIGURATION\n# ------------------------------------------------------------------------------\n# See: https://docs.djangoproject.com/en/dev/ref/settings/#secret-key\n# Raises ImproperlyConfigured exception if DJANGO_SECRET_KEY not in os.environ\nSECRET_KEY = env(\"DJANGO_SECRET_KEY\")  # noqa: F405\n\n# SECURITY WARNING: App Engine\"s security features ensure that it is safe to\n# have ALLOWED_HOSTS = [\"*\"] when the app is deployed. If you deploy a Django\n# app not on App Engine, make sure to set an appropriate host here.\n# See https://docs.djangoproject.com/en/1.10/ref/settings/\nALLOWED_HOSTS = [\"*\"]\n\n# URL Configuration\n# ------------------------------------------------------------------------------\nif env(\"DEPLOYMENT\", default=None) == \"prod\":  # noqa: F405\n    PREPEND_WWW = True\nelse:\n    PREPEND_WWW = False\n\n# DATABASE CONFIGURATION\n# ----------------------------------------------------------------------------\n# See: https://docs.djangoproject.com/en/dev/ref/settings/#databases\nDATABASES = {\n    \"default\": {\n        \"ENGINE\": \"django.db.backends.postgresql\",\n        \"NAME\": \"csunplugged\",\n        \"USER\": env(\"GOOGLE_CLOUD_SQL_DATABASE_USERNAME\"),  # noqa: F405\n        \"PASSWORD\": env(\"GOOGLE_CLOUD_SQL_DATABASE_PASSWORD\"),  # noqa: F405\n        \"HOST\": \"/cloudsql/\" + env(\"GOOGLE_CLOUD_SQL_CONNECTION_NAME\"),  # noqa: F405\n    }\n}\nDATABASES[\"default\"][\"ATOMIC_REQUESTS\"] = True\n\n# Static files\nSTATIC_URL = \"https://storage.googleapis.com/\" + env(\"GOOGLE_CLOUD_STORAGE_BUCKET_NAME\") + \"/static/\"  # noqa: F405\n\n# SECURITY CONFIGURATION\n# ------------------------------------------------------------------------------\n# See https://docs.djangoproject.com/en/dev/ref/middleware/#module-django.middleware.security\n# and https://docs.djangoproject.com/en/dev/howto/deployment/checklist/#run-manage-py-check-deploy\n\n# set this to 60 seconds and then to 518400 when you can prove it works\nSECURE_HSTS_SECONDS = 60\nSECURE_PROXY_SSL_HEADER = (\"HTTP_X_FORWARDED_PROTO\", \"https\")\nSECURE_HSTS_INCLUDE_SUBDOMAINS = env.bool(\"DJANGO_SECURE_HSTS_INCLUDE_SUBDOMAINS\", default=True)  # noqa: F405\nSECURE_CONTENT_TYPE_NOSNIFF = env.bool(\"DJANGO_SECURE_CONTENT_TYPE_NOSNIFF\", default=True)  # noqa: F405\nSECURE_BROWSER_XSS_FILTER = True\nSESSION_COOKIE_SECURE = True\nSESSION_COOKIE_HTTPONLY = True\nSECURE_SSL_REDIRECT = env.bool(\"DJANGO_SECURE_SSL_REDIRECT\", default=True)  # noqa: F405\nCSRF_COOKIE_SECURE = True\nCSRF_COOKIE_HTTPONLY = True\nX_FRAME_OPTIONS = \"DENY\"\n", "path": "csunplugged/config/settings/production.py"}]}