CSPViolationReport: documentURL property

Value

A string containing the URL of the document or worker that violated the CSP.

Examples

CSP inline script violation showing referrer

This example triggers a CSP violation using an inline script, and reports the violation using a ReportingObserver. We navigate to the page from another page and log the referrer, documentURL, and blockedURL.

HTML

First we define our referrer page /bounce/index.html. This page just contains a link to another page ../report_sample/index.html.

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  </head>
  <body>
    <ul>
      <li><a href="../report_sample/">report sample</a></li>
    </ul>
  </body>
</html>

The ../report_sample/index.html HTML file is defined below. This uses the <meta> element to set the Content-Security-Policy script-src-elem to self, which allows scripts to be loaded from the same domain, but does not allow inline scripts to be executed. The document also includes an inline script, which will trigger a CSP violation.

<!doctype html>
<!-- /report_sample/index.html -->
<html lang="en">
  <head>
    <meta
      http-equiv="Content-Security-Policy"
      content="script-src-elem 'self' 'report-sample'" />
    <script src="main.js"></script>
  </head>
  <body>
    <script>
      const int = 4;
    </script>
  </body>
</html>

JavaScript (main.js)

The report sample above also loads the external script main.js, which is shown below. Because this is loaded from the same domain as the HTML, it is not blocked by the CSP.

The script creates a new ReportingObserver to observe content violation reports of type "csp-violation". Each time the callback function is invoked, we get the body of the first entry of the reports array, and use it to log the violation documentURL, referrer, and blockedURL to the console.

// main.js
const observer = new ReportingObserver(
  (reports, observer) => {
    console.log(`documentURL: ${reports[0].body.documentURL}`);
    console.log(`referrer: ${reports[0].body.referrer}`);
    console.log(`blockedURL: ${reports[0].body.blockedURL}`);
  },
  {
    types: ["csp-violation"],
    buffered: true,
  },
);

observer.observe();

Note that while there might be multiple reports in the returned array, for brevity we only log the values of the first element.

Results

The console output for the above code would look a bit like that below (the site will depend on how the pages are served):

documentURL: http://127.0.0.1:9999/report_sample/
referrer: http://127.0.0.1:9999/bounce/
blockedURL: inline

Note that referrer is the page we navigated from, documentURL is the page with the CSP violation, and blockedURL is not a URL at all in this case, but an indication that the violation was caused by an inline script.

Specifications

Browser compatibility

See also

• SecurityPolicyViolationEvent.documentURI