diff --git a/mercurial/hgweb/hgweb_mod.py b/mercurial/hgweb/hgweb_mod.py
--- a/mercurial/hgweb/hgweb_mod.py
+++ b/mercurial/hgweb/hgweb_mod.py
@@ -650,7 +650,16 @@ class hgweb(object):
             raise Exception("suspicious path")
         return p
 
-    def run(self, req):
+    def run(self):
+        if os.environ['GATEWAY_INTERFACE'][0:6] != "CGI/1.":
+            raise RuntimeError("This function is only intended to be called while running as a CGI script.")
+        import mercurial.hgweb.wsgicgi as wsgicgi
+        from request import wsgiapplication
+        def make_web_app():
+            return self.__class__(self.repo, self.reponame)
+        wsgicgi.launch(wsgiapplication(make_web_app))
+
+    def run_wsgi(self, req):
         def header(**map):
             header_file = cStringIO.StringIO(''.join(self.t("header", **map)))
             msg = mimetools.Message(header_file, 0)