Except DisallowedHost in request span attributes

Author: davegaeddert

plain/plain/internal/handlers/base.py

@@ -4,7 +4,7 @@
 from opentelemetry import baggage, trace
 from opentelemetry.semconv.attributes import http_attributes, url_attributes
 
-from plain.exceptions import ImproperlyConfigured
+from plain.exceptions import DisallowedHost, ImproperlyConfigured
 from plain.logs.utils import log_response
 from plain.runtime import settings
 from plain.urls import get_resolver
@@ -78,6 +78,10 @@ def get_response(self, request):
         except KeyError:
             # Missing required WSGI environment variables (e.g. in tests)
             pass
+        except DisallowedHost:
+            # Invalid host header - skip URL_FULL for telemetry but let the
+            # exception be handled normally by middleware for proper 400 response
+            pass
 
         # Add query string if present
         if query_string := request.meta.get("QUERY_STRING"):