fix header encoding

examples/test.py

@@ -18,7 +18,8 @@ def app(environ, start_response):
     response_headers = [
         ('Content-type','text/plain'),
         ('Content-Length', str(len(data))),
-        ('X-Gunicorn-Version', __version__)
+        ('X-Gunicorn-Version', __version__),
+        ("Test", "test тест"),
     ]
     start_response(status, response_headers)
     return iter([data])

gunicorn/http/wsgi.py

@@ -210,6 +210,7 @@ class Response(object):
     def process_headers(self, headers):
         for name, value in headers:
             assert isinstance(name, string_types), "%r is not a string" % name
+
             lname = name.lower().strip()
             if lname == "content-length":
                 self.response_length = int(value)
@@ -220,11 +221,11 @@ class Response(object):
                         self.upgrade = True
                 elif lname == "upgrade":
                     if value.lower().strip() == "websocket":
-                        self.headers.append((name.strip(), str(value).strip()))
+                        self.headers.append((name.strip(), value.strip()))
 
                 # ignore hopbyhop headers
                 continue
-            self.headers.append((name.strip(), str(value).strip()))
+            self.headers.append((name.strip(), str(value.strip())))
 
 
     def is_chunked(self):
@@ -265,10 +266,10 @@ class Response(object):
         if self.headers_sent:
             return
         tosend = self.default_headers()
-        tosend.extend(["%s: %s\r\n" % (n, v) for n, v in self.headers])
+        tosend.extend(["%s: %s\r\n" % (k,v) for k, v in self.headers])
 
         header_str = "%s\r\n" % "".join(tosend)
-        util.write(self.sock, header_str.encode('latin1'))
+        util.write(self.sock, util.to_bytestring(header_str))
         self.headers_sent = True
 
     def write(self, arg):

gunicorn/util.py

@@ -348,3 +348,10 @@ def check_is_writeable(path):
     except IOError as e:
         raise RuntimeError("Error: '%s' isn't writable [%r]" % (path, e))
     f.close()
+
+def to_bytestring(value):
+    """Converts a string argument to a byte string"""
+    if isinstance(value, bytes):
+        return value
+    assert isinstance(value, text_type)
+    return value.encode("utf-8")