- Exceptions during publishing are now re-raised when in debug mode

CHANGES.rst

@@ -38,6 +38,9 @@ Features
 Other changes
 +++++++++++++
 
+- Exceptions during publishing are now re-raised when in debug mode
+  (`#562 <https://github.com/zopefoundation/Zope/issues/562>`_)
+
 - Remove hardcoded list of factories that don't want an add dialog
   (`#540 <https://github.com/zopefoundation/Zope/issues/540>`_)
 

src/ZPublisher/WSGIPublisher.py

@@ -161,7 +161,8 @@ def transaction_pubevents(request, response, tm=transaction.manager):
         try:
             # Raise exception from app if handle-errors is False
             # (set by zope.testbrowser in some cases)
-            if request.environ.get('x-wsgiorg.throw_errors', False):
+            if request.environ.get('x-wsgiorg.throw_errors', False) or \
+               response.debug_mode:
                 reraise(*exc_info)
 
             # Handle exception view

src/ZPublisher/tests/test_WSGIPublisher.py

@@ -636,6 +636,30 @@ def testHandleErrorsFalseBypassesExceptionResponse(self):
         with self.assertRaises(Unauthorized):
             self._callFUT(environ, start_response, _publish)
 
+    def testDebugModeBypassesExceptionResponse(self):
+        from zExceptions import BadRequest
+
+        # Register an exception view for BadRequest
+        registerExceptionView(IException)
+        environ = self._makeEnviron()
+        start_response = DummyCallable()
+        _publish = DummyCallable()
+        _publish._raise = BadRequest('debugbypass')
+
+        # Responses will always have debug_mode set
+        def response_factory(stdout, stderr):
+            response = DummyResponse()
+            response.debug_mode = True
+            return response
+
+        # With debug_mode, the exception view is not called.
+        with self.assertRaises(BadRequest):
+            self._callFUT(environ, start_response, _publish,
+                          _response_factory=response_factory)
+
+        # Clean up view registration
+        unregisterExceptionView(IException)
+
 
 class ExcViewCreatedTests(ZopeTestCase):