diff --git a/CHANGES/3980.feature b/CHANGES/3980.feature
new file mode 100644
index 00000000000..89654c156c4
--- /dev/null
+++ b/CHANGES/3980.feature
@@ -0,0 +1 @@
+Accept non-GET request for starting websocket handshake on server side.
diff --git a/aiohttp/web_ws.py b/aiohttp/web_ws.py
index 8e81eaaa3f3..4c5e7ca5529 100644
--- a/aiohttp/web_ws.py
+++ b/aiohttp/web_ws.py
@@ -26,7 +26,7 @@
 from .log import ws_logger
 from .streams import EofStream, FlowControlDataQueue
 from .typedefs import JSONDecoder, JSONEncoder
-from .web_exceptions import HTTPBadRequest, HTTPException, HTTPMethodNotAllowed
+from .web_exceptions import HTTPBadRequest, HTTPException
 from .web_request import BaseRequest
 from .web_response import StreamResponse
 
@@ -130,8 +130,6 @@ def _handshake(self, request: BaseRequest) -> Tuple['CIMultiDict[str]',
                                                         bool,
                                                         bool]:
         headers = request.headers
-        if request.method != hdrs.METH_GET:
-            raise HTTPMethodNotAllowed(request.method, [hdrs.METH_GET])
         if 'websocket' != headers.get(hdrs.UPGRADE, '').lower().strip():
             raise HTTPBadRequest(
                 text=('No WebSocket UPGRADE hdr: {}\n Can '
diff --git a/tests/test_web_websocket.py b/tests/test_web_websocket.py
index 2d810c85e60..cab47b01066 100644
--- a/tests/test_web_websocket.py
+++ b/tests/test_web_websocket.py
@@ -8,7 +8,7 @@
 from aiohttp.log import ws_logger
 from aiohttp.streams import EofStream
 from aiohttp.test_utils import make_mocked_coro, make_mocked_request
-from aiohttp.web import HTTPBadRequest, HTTPMethodNotAllowed, WebSocketResponse
+from aiohttp.web import HTTPBadRequest, WebSocketResponse
 from aiohttp.web_ws import WS_CLOSED_MESSAGE, WebSocketReady
 
 
@@ -203,12 +203,6 @@ def test_can_prepare_unknown_protocol(make_request) -> None:
     assert WebSocketReady(True, None) == ws.can_prepare(req)
 
 
-def test_can_prepare_invalid_method(make_request) -> None:
-    req = make_request('POST', '/')
-    ws = WebSocketResponse()
-    assert WebSocketReady(False, None) == ws.can_prepare(req)
-
-
 def test_can_prepare_without_upgrade(make_request) -> None:
     req = make_request('GET', '/',
                        headers=CIMultiDict({}))
@@ -302,11 +296,11 @@ async def test_close_idempotent(make_request) -> None:
     assert not (await ws.close(code=2, message='message2'))
 
 
-async def test_prepare_invalid_method(make_request) -> None:
+async def test_prepare_post_method_ok(make_request) -> None:
     req = make_request('POST', '/')
     ws = WebSocketResponse()
-    with pytest.raises(HTTPMethodNotAllowed):
-        await ws.prepare(req)
+    await ws.prepare(req)
+    assert ws.prepared
 
 
 async def test_prepare_without_upgrade(make_request) -> None:
diff --git a/tests/test_websocket_handshake.py b/tests/test_websocket_handshake.py
index 21852b3c290..1ab709e3cf7 100644
--- a/tests/test_websocket_handshake.py
+++ b/tests/test_websocket_handshake.py
@@ -32,13 +32,6 @@ def gen_ws_headers(protocols='', compress=0, extension_text='',
     return hdrs, key
 
 
-async def test_not_get() -> None:
-    ws = web.WebSocketResponse()
-    req = make_mocked_request('POST', '/')
-    with pytest.raises(web.HTTPMethodNotAllowed):
-        await ws.prepare(req)
-
-
 async def test_no_upgrade() -> None:
     ws = web.WebSocketResponse()
     req = make_mocked_request('GET', '/')