in opbeans/src/main/java/co/elastic/apm/opbeans/controllers/IndexController.java [48:52]
public String rumConfig(HttpServletResponse response) {
response.setContentType("text/javascript");
return String.format("window.elasticApmJsBaseServerUrl = '%s'",
env.getProperty("ELASTIC_APM_JS_SERVER_URL", "http://localhost:" + env.getProperty("local.server.port", "80")));
}