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-rw-r--r--src/hero.mjs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/hero.mjs b/src/hero.mjs
index ed3ecd2..314360c 100644
--- a/src/hero.mjs
+++ b/src/hero.mjs
@@ -386,7 +386,7 @@ export const extractQueryParams = s => {
export const renderStatus = code =>
`HTTP/1.1 ${code} ${http.STATUS_CODES[code]}`
-export const renderHeaders = obj =>
+export const renderHeaders = (obj = {}) =>
Object.keys(obj)
.sort(u.strSortFn)
.map(name => `${name}: ${obj[name]}`);