diff --git a/tests/test_tg1.py b/tests/test_tg1.py
index 5a4f593..f5a27a9 100644
--- a/tests/test_tg1.py
+++ b/tests/test_tg1.py
@@ -4,6 +4,7 @@ from wsmeext.tg11 import wsexpose, wsvalidate
 import wsmeext.tg1
 
 from turbogears.controllers import RootController
+import cherrypy
 
 import unittest
 
@@ -43,9 +44,14 @@ class Root(RootController):
     def multiply(self, a, b):
         return a * b
 
-    sub = Subcontroller()
+    @wsexpose(int)
+    @wsvalidate(int, int)
+    def divide(self, a, b):
+        if b == 0:
+            raise cherrypy.HTTPError(400, 'Cannot divide by zero!')
+        return a / b
 
-import cherrypy
+    sub = Subcontroller()
 
 from turbogears import testutil, config, startup
 
@@ -108,6 +114,31 @@ class TestController(unittest.TestCase):
         print response
         assert response.body == "<result>50</result>"
 
+    def test_custom_clientside_error(self):
+        response = self.app.post(
+            "/divide",
+            simplejson.dumps({'a': 5, 'b': 0}),
+            {'Content-Type': 'application/json', 'Accept': 'application/json'},
+            expect_errors=True
+        )
+        assert response.status_int == 400
+        assert simplejson.loads(response.body) == {
+            "debuginfo": None,
+            "faultcode": "Server",
+            "faultstring": "(400, 'Cannot divide by zero!')"
+        }
+
+        response = self.app.post(
+            "/divide",
+            simplejson.dumps({'a': 5, 'b': 0}),
+            {'Content-Type': 'application/json', 'Accept': 'text/xml'},
+            expect_errors=True
+        )
+        assert response.status_int == 400
+        assert response.body == ("<error><faultcode>Server</faultcode>"
+                                 "<faultstring>(400, 'Cannot divide by zero!')"
+                                 "</faultstring><debuginfo /></error>")
+
     def test_soap_wsdl(self):
         ts = test_soap.TestSOAP('test_wsdl')
         ts.app = self.app
diff --git a/tests/test_tg15.py b/tests/test_tg15.py
index 61f9127..36c6860 100644
--- a/tests/test_tg15.py
+++ b/tests/test_tg15.py
@@ -2,6 +2,7 @@ import wsmeext.tg15
 from wsme import WSRoot
 
 from turbogears.controllers import RootController
+import cherrypy
 
 from wsmeext.tests import test_soap
 
@@ -35,6 +36,13 @@ class Root(RootController):
     def multiply(self, a, b):
         return a * b
 
+    @wsmeext.tg15.wsexpose(int)
+    @wsmeext.tg15.wsvalidate(int, int)
+    def divide(self, a, b):
+        if b == 0:
+            raise cherrypy.HTTPError(400, 'Cannot divide by zero!')
+        return a / b
+
 
 from turbogears import testutil
 
@@ -91,6 +99,31 @@ class TestController(testutil.TGTest):
         print response
         assert response.body == "<result>50</result>"
 
+    def test_custom_clientside_error(self):
+        response = self.app.post(
+            "/divide",
+            simplejson.dumps({'a': 5, 'b': 0}),
+            {'Content-Type': 'application/json', 'Accept': 'application/json'},
+            expect_errors=True
+        )
+        assert response.status_int == 400
+        assert simplejson.loads(response.body) == {
+            "debuginfo": None,
+            "faultcode": "Server",
+            "faultstring": "(400, 'Cannot divide by zero!')"
+        }
+
+        response = self.app.post(
+            "/divide",
+            simplejson.dumps({'a': 5, 'b': 0}),
+            {'Content-Type': 'application/json', 'Accept': 'text/xml'},
+            expect_errors=True
+        )
+        assert response.status_int == 400
+        assert response.body == ("<error><faultcode>Server</faultcode>"
+                                 "<faultstring>(400, 'Cannot divide by zero!')"
+                                 "</faultstring><debuginfo /></error>")
+
     def test_soap_wsdl(self):
         wsdl = self.app.get('/ws/api.wsdl').body
         print wsdl
diff --git a/wsmeext/tg1.py b/wsmeext/tg1.py
index 70582d2..16a7bdf 100644
--- a/wsmeext/tg1.py
+++ b/wsmeext/tg1.py
@@ -4,15 +4,17 @@ except ImportError:
     import simplejson as json  # noqa
 
 import functools
+import sys
 
 import cherrypy
 import webob
-from turbogears import expose
+from turbogears import expose, util
 
 from wsme.rest import validate as wsvalidate
 import wsme.api
 import wsme.rest.args
 import wsme.rest.json
+from wsmeext.utils import is_valid_code
 
 import inspect
 
@@ -55,7 +57,35 @@ def wsexpose(*args, **kwargs):
             )
             if funcdef.pass_request:
                 kwargs[funcdef.pass_request] = cherrypy.request
-            result = f(self, *args, **kwargs)
+            try:
+                result = f(self, *args, **kwargs)
+            except:
+                try:
+                    exception_info = sys.exc_info()
+                    orig_exception = exception_info[1]
+                    if isinstance(orig_exception, cherrypy.HTTPError):
+                        orig_code = getattr(orig_exception, 'status', None)
+                    else:
+                        orig_code = getattr(orig_exception, 'code', None)
+                    data = wsme.api.format_exception(exception_info)
+                finally:
+                    del exception_info
+
+                cherrypy.response.status = 500
+                if data['faultcode'] == 'client':
+                    cherrypy.response.status = 400
+                elif orig_code and is_valid_code(orig_code):
+                    cherrypy.response.status = orig_code
+
+                accept = cherrypy.request.headers.get('Accept', "").lower()
+                accept = util.simplify_http_accept_header(accept)
+
+                decorators = {'text/xml': wsme.rest.xml.encode_error}
+                return decorators.get(
+                    accept,
+                    wsme.rest.json.encode_error
+                )(None, data)
+
             return dict(
                 datatype=funcdef.return_type,
                 result=result
@@ -116,7 +146,6 @@ class Controller(object):
         cherrypy.response.status = res.status
         return res.body
 
-
 import wsme.rest