From 17bdc3db5210440b677e36f0db1222c73486b440 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=2E=20K=C3=A4rkk=C3=A4inen?=
 <tronic@users.noreply.github.com>
Date: Mon, 29 Jul 2019 19:18:15 +0300
Subject: [PATCH] Fix string escape.

---
 sanic/headers.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sanic/headers.py b/sanic/headers.py
index fccef120..9ef28fa3 100644
--- a/sanic/headers.py
+++ b/sanic/headers.py
@@ -1,7 +1,7 @@
 import re
 
 token, quoted = r"([\w!#$%&'*+\-.^_`|~]+)", r'"((?:[^"]|\\")*)"'
-parameter = re.compile(f';\s*{token}=(?:{token}|{quoted})', re.ASCII)
+parameter = re.compile(fr';\s*{token}=(?:{token}|{quoted})', re.ASCII)
 
 
 def parse_options_header(value: str):