This is a fix to check the argument to RequestHandler.write()

is one of the accepted types: dict, bytes or unicode and raise a TypeError otherwise

diff --git a/tornado/web.py b/tornado/web.py
index b22b11fe60888e9aa19a828f582dd1eb8a0eeaa9..d3f260bdbd1a929e35fb883eed61ce1d25be809c 100644 (file)
--- a/tornado/web.py
+++ b/tornado/web.py
@@ -604,6 +604,8 @@ class RequestHandler(object):
             raise RuntimeError("Cannot write() after finish().  May be caused "
                                "by using async operations without the "
                                "@asynchronous decorator.")
+        if not isinstance(chunk, (bytes_type, unicode_type, dict)):
+            raise TypeError("write() only accepts bytes, unicode, and dict objects")
         if isinstance(chunk, dict):
             chunk = escape.json_encode(chunk)
             self.set_header("Content-Type", "application/json; charset=UTF-8")