@@ -21,11 +21,7 @@ func copyResponseHeaders(w http.ResponseWriter, headers http.Header) {
 	for k, v := range headers {
 		if !slice.Contains(skipHeaders, k, slice.WithCaseInsensitive()) {
 			for _, val := range v {
-				if header.Get(k) == "" {
-					header.Set(k, val)
-				} else {
-					header.Add(k, val)
-				}
+				header.Add(k, val)
 			}
 		}
 	}
Original file line number	Diff line number	Diff line change
`@@ -21,11 +21,7 @@ func copyResponseHeaders(w http.ResponseWriter, headers http.Header) {`
`21`	`21`	`for k, v := range headers {`
`22`	`22`	`if !slice.Contains(skipHeaders, k, slice.WithCaseInsensitive()) {`
`23`	`23`	`for _, val := range v {`
`24`		`- if header.Get(k) == "" {`
`25`		`- header.Set(k, val)`
`26`		`- } else {`
`27`		`- header.Add(k, val)`
`28`		`- }`
	`24`	`+ header.Add(k, val)`
`29`	`25`	`}`
`30`	`26`	`}`
`31`	`27`	`}`