diff --git a/ahserver/baseProcessor.py b/ahserver/baseProcessor.py
index 08bc7e4..26cc12b 100644
--- a/ahserver/baseProcessor.py
+++ b/ahserver/baseProcessor.py
@@ -68,7 +68,9 @@ class BaseProcessor:
 		if self.env_set:
 			self.run_ns['params_kw'].update(params)
 			return
-		self.real_path = self.resource.url2file(request.path)
+		# Only calculate real_path if not already set (e.g., by fallback in _handle)
+		if not hasattr(self, 'real_path') or self.real_path is None:
+			self.real_path = self.resource.url2file(request.path)
 		g = ServerEnv()
 		self.run_ns = DictObject()
 		self.run_ns.update(g)
diff --git a/ahserver/processorResource.py b/ahserver/processorResource.py
index 6b25850..8a939f7 100644
--- a/ahserver/processorResource.py
+++ b/ahserver/processorResource.py
@@ -377,6 +377,9 @@ class ProcessorResource(StaticResource,Url2File):
 		request['port'] = config.website.port
 		processor = self.url2processor(request, str(request.url), self.request_filename)
 		if processor:
+			# Fix real_path when fallback added an extension
+			if self.request_filename and (not hasattr(processor, 'real_path') or not processor.real_path):
+				processor.real_path = self.request_filename
 			ret = await processor.handle(request)
 			return ret