DevTools failed to load SourceMap

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.3.3 CE GA4
• Fix Version/s: 7.4.3.40 CE GA40, 7.4.3.42 CE GA42, Master
• Component/s: JS APIs and Utilities
• Labels:
  • backend_test
  • ee-ts
• Story Points: 1
• Fix Priority: 3
• OS:
  Windows 10
• JDK:
  Oracle Sun JDK 8
• Application Servers:
  Apache Tomcat 9.0.x
• Browsers:
  Chrome (latest)
• Databases:
  MySQL 8
• Device Type:
  Desktop
• Git Pull Request: https://github.com/liferay-frontend/liferay-portal/pull/2578

On a freshly installed 7.3.3 when opening Chrome DevTools we get a lot of warnings:

DevTools failed to load SourceMap: Could not load content for http://localhost:8733/poller.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/util.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/workflow.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/dom.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/pathParser.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/language.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/state.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/index.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/ToastContainer.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/init.es.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/Provider.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/throttle.es.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/search_bar.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/util_window.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/navigation_interaction.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/GlobalMenu.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/PersonalMenu.es.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/layout_column.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/layout.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/menu_toggle.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
5DevTools failed to load SourceMap: Could not load content for http://localhost:8733/combo/index.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
combo?browserId=chrome&minifierType=js&languageId=en_US&b=7303&t=1597304735370&/o/frontend-js-aui-web/aui/widget-skin/widget-skin.js&/o/frontend-js-aui-web/aui/widget-uievents/widget-uievents.js&/o/frontend-js-aui-web/aui/yui-throttle/yui-throttle.js&/o/frontend-js-aui-web/aui/aui-base-core/aui-base-core.js&/o/frontend-js-aui-web/aui/aui-classnamemanager/aui-classnamemanager.js&/o/frontend-js-aui-web/aui/aui-component/aui-component.js&/o/frontend-js-aui-web/aui/aui-debounce/aui-debounce.js&/o/frontend-js-aui-web/aui/aui-delayed-task-deprecated/aui-delayed-task-deprecated.js&/o/frontend-js-aui-web/aui/aui-event-base/aui-event-base.js&/o/frontend-js-aui-web/aui/aui-event-input/aui-event-input.js&/o/frontend-js-aui-web/aui/aui-form-validator/aui-form-validator.js&/o/frontend-js-aui-web/aui/aui-node-base/aui-node-base.js&/o/frontend-js-aui-web/aui/aui-node-html5/aui-node-html5.js&/o/frontend-js-aui-web/aui/aui-selector/aui-selector.js&/o/frontend-js-aui-web/aui/aui-timer/aui-timer.js&/o/frontend-js-aui-web/liferay/browser_selectors.js&/o/frontend-js-aui-web/liferay/form.js&/o/frontend-js-aui-web/liferay/form_placeholders.js&/o/frontend-js-aui-web/liferay/icon.js&/o/frontend-js-aui-web/liferay/menu.js&/o/frontend-js-aui-web/liferay/notice.js&/o/frontend-js-aui-web/liferay/poller.js&/o/frontend-js-aui-web/aui/async-queue/async-queue.js&/o/frontend-js-aui-web/aui/base-build/base-build.js&/o/frontend-js-aui-web/aui/cookie/cookie.js&/o/frontend-js-aui-web/aui/event-touch/event-touch.js&/o/frontend-js-aui-web/aui/overlay/overlay.js&/o/frontend-js-aui-web/aui/querystring-stringify/querystring-stringify.js&/o/frontend-js-aui-web/aui/widget-child/widget-child.js&/o/frontend-js-aui-web/aui/widget-position-align/widget-position-align.js&/o/frontend-js-aui-web/aui/widget-position-constrain/widget-position-constrain.js&/o/frontend-js-aui-web/aui/widget-position/widget-position.js&/o/frontend-js-aui-web/aui/widget-stack/widget-stack.js:8108 [Violation] 'setTimeout' handler took 3297ms