DevTools failed to load SourceMap: Could not load content for on Chrome browser


  • While using a production instance of Liferay, the below warning will appear in the Chrome console:
    DevTools failed to load SourceMap: Could not load content for http://localhost:8080/ HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE


  • Liferay DXP 7.2
  • Liferay DXP 7.3
  • Liferay DXP 7.4


  • The warning does not flag any Liferay bugs and can be safely ignored
  • As a client-side workaround, customers can navigate to the "Settings" for Developer Tools, then uncheck Enable JavaScript Sourcemaps under the "Sources" settings:
  • The file, per se, allows the debugging of popper.js.
  • Debug mode in Liferay is triggered by adding, among others, the below two properties:
    With these 2 lines, the warning will no longer be printed and debug for Popper.js source map will be possible.
  • When in a production environment, normally these properties are set to true, then the source maps are no longer available, as we activate fast load which is using to group and load more files at the same time (JS or CSS), so it is more efficient. Because of this, some source maps are not being found and are failing (for example,

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