add sample code

python/sample/client_http_protobuf.py

@@ -0,0 +1,50 @@
+# -*- coding:UTF-8 -*-
+
+# Copyright (c) 2014 Baidu.com, Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This is a sample code to show how to use python client of sofa-pbrpc.
+#
+# Preconditions:
+#   * The protobuf python lib has been installed.
+#   * The sofa-pbrpc python lib has been installed.
+#   * The server in ../../sample/echo has been started.
+#
+# For more, please refer to `./README'.
+
+from sofa.pbrpc import client
+import echo_service_pb2
+import sys
+import urllib2
+
+# Prepare post data
+echo_request = echo_service_pb2.EchoRequest()
+echo_request.message = 'Hello World'
+send_data = echo_request.SerializeToString()
+
+# Prepare http request
+url = 'http://localhost:12321/sofa.pbrpc.test.EchoServer.Echo'
+accept = 'application/protobuf'
+headers = { 'Accept' : accept }
+request = urllib2.Request(url, send_data, headers)
+
+# Send request 
+try:
+    response = urllib2.urlopen(request)
+except Exception as e:
+    print "ERROR: Send fail: %s" % e.reason
+    sys.exit(1)
+
+# Read http body
+recv_data = response.read()
+
+# check failure
+if response.info().getheader('Content-Type') != accept:
+    print "ERROR: %s" % recv_data
+    sys.exit(1)
+
+# print response
+echo_response = echo_service_pb2.EchoResponse()
+echo_response.ParseFromString(recv_data)
+print "Response:\n%s" % echo_response.message