diff --git a/aiohttp/web.py b/aiohttp/web.py
index 366d44cba7e..3008be6e6b7 100644
--- a/aiohttp/web.py
+++ b/aiohttp/web.py
@@ -348,6 +348,10 @@ def post(self):
             self._post = MultiDictProxy(MultiDict())
             return self._post
 
+        if self.headers.get('expect', '').lower() == "100-continue":
+            if self.version == HttpVersion11:
+                self.transport.write(b"HTTP/1.1 100 Continue\r\n\r\n")
+
         body = yield from self.read()
         content_charset = self.charset or 'utf-8'
 
diff --git a/tests/test_web_functional.py b/tests/test_web_functional.py
index 2efd291e56e..591d01270d0 100644
--- a/tests/test_web_functional.py
+++ b/tests/test_web_functional.py
@@ -95,6 +95,31 @@ def go():
 
         self.loop.run_until_complete(go())
 
+    def test_post_100_continue(self):
+        @asyncio.coroutine
+        def handler(request):
+            data = yield from request.post()
+            self.assertEqual(b'123', data['name'])
+            return web.Response()
+
+        @asyncio.coroutine
+        def go():
+            _, _, url = yield from self.create_server('POST', '/', handler)
+
+            form = FormData()
+            form.add_field('name', b'123',
+                           content_transfer_encoding='base64')
+
+            resp = yield from request(
+                'post', url, data=form,
+                expect100=True,  # wait until server returns 100 continue
+                loop=self.loop)
+
+            self.assertEqual(200, resp.status)
+
+        self.loop.run_until_complete(
+            asyncio.wait_for(go(), timeout=0.1, loop=self.loop))
+
     def test_post_json(self):
 
         dct = {'key': 'текст'}
diff --git a/tests/test_web_request.py b/tests/test_web_request.py
index eddcb3eb78f..f0ec725973b 100644
--- a/tests/test_web_request.py
+++ b/tests/test_web_request.py
@@ -116,6 +116,42 @@ def test_call_POST_on_GET_request(self):
         ret = self.loop.run_until_complete(req.post())
         self.assertEqual(CIMultiDict(), ret)
 
+    def test_call_POST_for_100_continue(self):
+        body = b"123"
+        req = self.make_request(
+            'POST', '/',
+            headers=CIMultiDict({"EXPECT": "100-Continue",
+                                 'CONTENT-TYPE': ''}))
+        with mock.patch.object(req, "read", side_effect=StopIteration(body)):
+            ret = self.loop.run_until_complete(req.post())
+        self.assertEqual(ret, body)
+        req.transport.write.assert_called_with(
+            b'HTTP/1.1 100 Continue\r\n\r\n')
+
+    def test_call_POST_for_100_continue_HTTP10(self):
+        body = b"123"
+        req = self.make_request(
+            'POST', '/',
+            headers=CIMultiDict({"EXPECT": "100-Continue",
+                                 'CONTENT-TYPE': ''}),
+            version=HttpVersion(1, 0))
+
+        with mock.patch.object(req, "read", side_effect=StopIteration(body)):
+            ret = self.loop.run_until_complete(req.post())
+        self.assertEqual(ret, body)
+        self.assertFalse(req.transport.write.call_args_list)
+
+    def test_call_POST_for_other_expect(self):
+        body = b"123"
+        req = self.make_request(
+            'POST', '/',
+            headers=CIMultiDict({"EXPECT": "Other-thing",
+                                 'CONTENT-TYPE': ''}))
+        with mock.patch.object(req, "read", side_effect=StopIteration(body)):
+            ret = self.loop.run_until_complete(req.post())
+        self.assertEqual(ret, body)
+        self.assertFalse(req.transport.write.call_args_list)
+
     def test_call_POST_on_weird_content_type(self):
         req = self.make_request(
             'POST', '/',