public HealthCheckServiceBuilder healthyResponse(AggregatedHttpResponse healthyResponse) {
        requireNonNull(healthyResponse, "healthyResponse");
        this.healthyResponse = copyResponse(healthyResponse);
        return this;
    }
Sets the {@link AggregatedHttpResponse} to send when the {@link Service} is healthy. The following
response is sent by default:

<pre>{@code
HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8

{ "healthy": true }
}</pre>

@return {@code this}
core/src/main/java/com/linecorp/armeria/server/healthcheck/HealthCheckServiceBuilder.java