Trim quotes from proxy_set_header header name

pkg/middlewares/ingressnginx/snippet/action.go

@@ -393,7 +393,7 @@ func createProxySetHeaderAction(d config.IDirective) (action, error) {
 		return nil, errors.New("proxy_set_header directive requires 2 parameters (header and value)")
 	}
 
-	key := params[0].String()
+	key := trimQuote(params[0].String())
 	val := trimQuote(params[1].String())
 
 	return func(rw http.ResponseWriter, req *http.Request, ctx *actionContext) (bool, error) {

pkg/middlewares/ingressnginx/snippet/snippet_test.go

@@ -399,6 +399,15 @@ proxy_set_header Accept-Encoding "";
 				"Accept-Encoding",
 			},
 		},
+		{
+			desc: "proxy_set_header with quoted header name",
+			configurationSnippet: `
+proxy_set_header "X-Custom-Header" "my-value";
+`,
+			expectedRequestHeaders: map[string]string{
+				"X-Custom-Header": "my-value",
+			},
+		},
 		{
 			desc: "set directive creates variable",
 			configurationSnippet: `