Merge 2b862559f4 into 1d434dec47

docs/en/docs/advanced/middleware.md

@@ -68,6 +68,7 @@ Enforces that all incoming requests have a correctly set `Host` header, in order
 The following arguments are supported:
 
 * `allowed_hosts` - A list of domain names that should be allowed as hostnames. Wildcard domains such as `*.example.com` are supported for matching subdomains. To allow any hostname either use `allowed_hosts=["*"]` or omit the middleware.
+* `www_redirect` - If set to True, requests to non-www versions of the allowed hosts will be redirected to their www counterparts. Defaults to `True`.
 
 If an incoming request does not validate correctly then a `400` response will be sent.
 

docs_src/advanced_middleware/tutorial002.py

@@ -4,7 +4,9 @@ from fastapi.middleware.trustedhost import TrustedHostMiddleware
 app = FastAPI()
 
 app.add_middleware(
-    TrustedHostMiddleware, allowed_hosts=["example.com", "*.example.com"]
+    TrustedHostMiddleware,
+    allowed_hosts=["example.com", "*.example.com"],
+    www_redirect=True,
 )