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-rw-r--r--synapse/http/proxyagent.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/http/proxyagent.py b/synapse/http/proxyagent.py
index 7a6a1717de..f7193e60bd 100644
--- a/synapse/http/proxyagent.py
+++ b/synapse/http/proxyagent.py
@@ -172,7 +172,7 @@ class ProxyAgent(_AgentBase):
         """
         uri = uri.strip()
         if not _VALID_URI.match(uri):
-            raise ValueError("Invalid URI {!r}".format(uri))
+            raise ValueError(f"Invalid URI {uri!r}")
 
         parsed_uri = URI.fromBytes(uri)
         pool_key = (parsed_uri.scheme, parsed_uri.host, parsed_uri.port)