Fixed #5956 -- Added a better error description for non-ASCII HTTP headers. Patch from jvloothuis.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6927 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/http/__init__.py

@@ -277,7 +277,20 @@ class HttpResponse(object):
             for key, value in self._headers.values()]) \
             + '\n\n' + self.content
 
+    def _convert_to_ascii(self, *values):
+        "Convert all values to ascii strings"
+        for value in values:
+            if isinstance(value, unicode):
+                try:
+                    yield value.encode('us-ascii')
+                except UnicodeError, e:
+                    e.reason += ', HTTP response headers must be in US-ASCII format'
+                    raise
+            else:
+                yield str(value)
+
     def __setitem__(self, header, value):
+        header, value = self._convert_to_ascii(header, value)
         self._headers[header.lower()] = (header, value)
 
     def __delitem__(self, header):