diff --git a/synapse/rest/client/v1/transactions.py b/synapse/rest/client/v1/transactions.py
deleted file mode 100644
index 774430458a..0000000000
--- a/synapse/rest/client/v1/transactions.py
+++ /dev/null
@@ -1,75 +0,0 @@
-# -*- coding: utf-8 -*-
-# Copyright 2014-2016 OpenMarket Ltd
-#
-# 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.
-
-"""This module contains logic for storing HTTP PUT transactions. This is used
-to ensure idempotency when performing PUTs using the REST API."""
-import logging
-
-from synapse.api.auth import get_access_token_from_request
-
-logger = logging.getLogger(__name__)
-
-
-class HttpTransactionCache(object):
-
- def __init__(self):
- # { key : (txn_id, res_observ_defer) }
- self.transactions = {}
-
- def _get_response(self, key, txn_id):
- try:
- (last_txn_id, res_observ_defer) = self.transactions[key]
- if txn_id == last_txn_id:
- logger.info("get_response: Returning a response for %s", txn_id)
- return res_observ_defer
- except KeyError:
- pass
- return None
-
- def _store_response(self, key, txn_id, res_observ_defer):
- self.transactions[key] = (txn_id, res_observ_defer)
-
- def store_client_transaction(self, request, txn_id, res_observ_defer):
- """Stores the request/Promise<response> pair of an HTTP transaction.
-
- Args:
- request (twisted.web.http.Request): The twisted HTTP request. This
- request must have the transaction ID as the last path segment.
- res_observ_defer (Promise<tuple>): A tuple of (response code, response dict)
- txn_id (str): The transaction ID for this request.
- """
- self._store_response(self._get_key(request), txn_id, res_observ_defer)
-
- def get_client_transaction(self, request, txn_id):
- """Retrieves a stored response if there was one.
-
- Args:
- request (twisted.web.http.Request): The twisted HTTP request. This
- request must have the transaction ID as the last path segment.
- txn_id (str): The transaction ID for this request.
- Returns:
- Promise: Resolves to the response tuple.
- Raises:
- KeyError if the transaction was not found.
- """
- res_observ_defer = self._get_response(self._get_key(request), txn_id)
- if res_observ_defer is None:
- raise KeyError("Transaction not found.")
- return res_observ_defer
-
- def _get_key(self, request):
- token = get_access_token_from_request(request)
- path_without_txn_id = request.path.rsplit("/", 1)[0]
- return path_without_txn_id + "/" + token
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