[FIX] website: wrong canonical URL after reroute

A reroute in an internal redirection, the URL on the current request is
changed. The actual changes occurs on the "WSGI environment", a
dictionnary that is populated with the request information by the WSGI
server (werkzeug in our case). Among all the properties there are
PATH_INFO, RAW_URI and REQUEST_URI.

* PATH_INFO is the standard value, it contains a RFC-3986 path.
  `request.httprequest.path` is based on that value.
* RAW_URI and REQUEST_PATH are two custom values set by werkzeug to
  mimic other popular wsgi servers (gunicorn, uwsgi, mod_wsgi), they
  also only contain a RFC-3986 path.

When rerouting only PATH_INFO and RAW_URI are updated. REQUEST_URI is
left as-is in order to keep the original path somewhere. When building
the cannonical path, one must use the original path instead of the
rerouted one.

X-original-commit: 779486c4dff23b946b4b14e3dca164ecca4f85a8
Part-of: odoo/odoo#91034

addons/website/models/website.py

@@ -1312,12 +1312,13 @@ class Website(models.Model):
 
             router = http.root.get_db_router(request.db).bind('')
             path = router.build(rule.endpoint, args)
+            if lang != self.default_lang_id:
+                path = f'/{lang.url_code}{path}'
         except (NotFound, AccessError, MissingError):
             # The build method returns a quoted URL so convert in this case for consistency.
-            path = urls.url_quote_plus(request.httprequest.path, safe='/')
-        lang_path = f'/{lang.url_code}' if lang != self.default_lang_id else ''
+            path = urls.url_quote_plus(request.httprequest.environ['REQUEST_URI'], safe='/')
         canonical_query_string = f'?{urls.url_encode(canonical_params)}' if canonical_params else ''
-        return self.get_base_url() + lang_path + path + canonical_query_string
+        return self.get_base_url() + path + canonical_query_string
 
     def _get_canonical_url(self, canonical_params):
         """Returns the canonical URL for the current request."""