diff --git a/synapse/http/matrixfederationclient.py b/synapse/http/matrixfederationclient.py
index 2d47b9ea00..7b33b9f10a 100644
--- a/synapse/http/matrixfederationclient.py
+++ b/synapse/http/matrixfederationclient.py
@@ -17,11 +17,9 @@ import cgi
import logging
import random
import sys
+import urllib
from io import BytesIO
-from six import raise_from, string_types
-from six.moves import urllib
-
import attr
import treq
from canonicaljson import encode_canonical_json
@@ -432,10 +430,10 @@ class MatrixFederationHttpClient(object):
except TimeoutError as e:
raise RequestSendFailed(e, can_retry=True) from e
except DNSLookupError as e:
- raise_from(RequestSendFailed(e, can_retry=retry_on_dns_fail), e)
+ raise RequestSendFailed(e, can_retry=retry_on_dns_fail) from e
except Exception as e:
logger.info("Failed to send request: %s", e)
- raise_from(RequestSendFailed(e, can_retry=True), e)
+ raise RequestSendFailed(e, can_retry=True) from e
incoming_responses_counter.labels(
request.method, response.code
@@ -487,7 +485,7 @@ class MatrixFederationHttpClient(object):
# Retry if the error is a 429 (Too Many Requests),
# otherwise just raise a standard HttpResponseException
if response.code == 429:
- raise_from(RequestSendFailed(e, can_retry=True), e)
+ raise RequestSendFailed(e, can_retry=True) from e
else:
raise e
@@ -998,7 +996,7 @@ def encode_query_args(args):
encoded_args = {}
for k, vs in args.items():
- if isinstance(vs, string_types):
+ if isinstance(vs, str):
vs = [vs]
encoded_args[k] = [v.encode("UTF-8") for v in vs]
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