fix: endpoint_client configure bug fix #1739

Job	Run time
test / test-dart-vm (3.0.1)	3m 37s
test / test-dart-vm (stable)	2m 48s
native_test / test-dart-native (macos-latest)	3m 9s
ddc_test / test-dart-ddc (3.0.1, chrome)	2m 55s
dart2js_test / test-dart-2js (3.0.1, chrome)	3m 26s
native_test / test-dart-native (windows-latest)	3m 49s
ddc_test / test-dart-ddc (3.0.1, firefox)	3m 13s
dart2js_test / test-dart-2js (3.0.1, firefox)	3m 33s
ddc_test / test-dart-ddc (stable, chrome)	2m 55s
dart2js_test / test-dart-2js (stable, chrome)	3m 36s
ddc_test / test-dart-ddc (stable, firefox)	3m 13s
dart2js_test / test-dart-2js (stable, firefox)	3m 40s
	39m 54s

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