diff --git a/synapse/rest/client/rendezvous.py b/synapse/rest/client/rendezvous.py
new file mode 100644
index 0000000000..89176b1ffa
--- /dev/null
+++ b/synapse/rest/client/rendezvous.py
@@ -0,0 +1,74 @@
+# Copyright 2022 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import logging
+from http.client import TEMPORARY_REDIRECT
+from typing import TYPE_CHECKING, Optional
+
+from synapse.http.server import HttpServer, respond_with_redirect
+from synapse.http.servlet import RestServlet
+from synapse.http.site import SynapseRequest
+from synapse.rest.client._base import client_patterns
+
+if TYPE_CHECKING:
+ from synapse.server import HomeServer
+
+logger = logging.getLogger(__name__)
+
+
+class RendezvousServlet(RestServlet):
+ """
+ This is a placeholder implementation of [MSC3886](https://github.com/matrix-org/matrix-spec-proposals/pull/3886)
+ simple client rendezvous capability that is used by the "Sign in with QR" functionality.
+
+ This implementation only serves as a 307 redirect to a configured server rather than being a full implementation.
+
+ A module that implements the full functionality is available at: https://pypi.org/project/matrix-http-rendezvous-synapse/.
+
+ Request:
+
+ POST /rendezvous HTTP/1.1
+ Content-Type: ...
+
+ ...
+
+ Response:
+
+ HTTP/1.1 307
+ Location: <configured endpoint>
+ """
+
+ PATTERNS = client_patterns(
+ "/org.matrix.msc3886/rendezvous$", releases=[], v1=False, unstable=True
+ )
+
+ def __init__(self, hs: "HomeServer"):
+ super().__init__()
+ redirection_target: Optional[str] = hs.config.experimental.msc3886_endpoint
+ assert (
+ redirection_target is not None
+ ), "Servlet is only registered if there is a redirection target"
+ self.endpoint = redirection_target.encode("utf-8")
+
+ async def on_POST(self, request: SynapseRequest) -> None:
+ respond_with_redirect(
+ request, self.endpoint, statusCode=TEMPORARY_REDIRECT, cors=True
+ )
+
+ # PUT, GET and DELETE are not implemented as they should be fulfilled by the redirect target.
+
+
+def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
+ if hs.config.experimental.msc3886_endpoint is not None:
+ RendezvousServlet(hs).register(http_server)
diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py
index 4b87ee978a..9b1b72c68a 100644
--- a/synapse/rest/client/versions.py
+++ b/synapse/rest/client/versions.py
@@ -116,6 +116,9 @@ class VersionsRestServlet(RestServlet):
"org.matrix.msc3881": self.config.experimental.msc3881_enabled,
# Adds support for filtering /messages by event relation.
"org.matrix.msc3874": self.config.experimental.msc3874_enabled,
+ # Adds support for simple HTTP rendezvous as per MSC3886
+ "org.matrix.msc3886": self.config.experimental.msc3886_endpoint
+ is not None,
},
},
)
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