fix: FLASK_SERVER_NAME error behind reverse proxy

.env.development

@@ -15,7 +15,7 @@ BEHIND_REVERSE_PROXY="false"
 # set to "true" if your app is behind a proxy, this helps to get real IP address
 # see: https://werkzeug.palletsprojects.com/en/latest/middleware/proxy_fix/#werkzeug.middleware.proxy_fix.ProxyFix
 PROXYFIX_EXTRA_KWARGS='{}'
-# e.g., {"x_prefix": 1} to make url_for work behind reverse proxy (like `URL Rewrite`)
+# e.g., {"x_prefix": 1, "x_host": 1} to make url_for work behind reverse proxy (like `URL Rewrite`)
 BIND_HOST="127.0.0.1"
 BIND_PORT="5000"
 SQLALCHEMY_DATABASE_URI="sqlite:///main.db"

README.md

@@ -105,6 +105,7 @@ Example rule:
                     <serverVariables>
                         <set name="HTTP_SEC_WEBSOCKET_EXTENSIONS" value="" />
                         <set name="HTTP_X_FORWARDED_PREFIX" value="/clip-basepath/" />
+                        <set name="HTTP_X_FORWARDED_HOST" value="example.com" />
                     </serverVariables>
                     <action type="Rewrite" url="{C:1}://127.0.0.1:5000{R:1}" />
                 </rule>
@@ -130,7 +131,7 @@ Example rule:
 #### URL Rewrite
 
 - Download and install [URL Rewrite](https://www.iis.net/downloads/microsoft/url-rewrite)
-- View Server Variables: add `HTTP_SEC_WEBSOCKET_EXTENSIONS` and `HTTP_X_FORWARDED_PREFIX` to allowlist
+- View Server Variables: add `HTTP_SEC_WEBSOCKET_EXTENSIONS`, `HTTP_X_FORWARDED_PREFIX`, `HTTP_X_FORWARDED_HOST` to allowlist
 - URL Rewrite Rules: see `web.config` below
 - Virtual directory: point from `clip-basepath` to `server/app/templates`
 

server/wsgi.py

@@ -26,6 +26,7 @@ def parse_custom_args() -> None:
 
     if any((export_metadata, export_openapi)):
         no_run_server = True
+        environ["FLASK_ENV"] = "production"
         from json import dump
 
     if export_metadata: