Content Security Policy (CSP) Headers

If the website specifies Content Security Policy headers, those headers may need to be modified in order to allow visitors to run Glance sessions.

Glance Cobrowse requires a policy which:

  • Includes JavaScript, CSS, and images from and, unless self-hosting.

  • Allows cross domain requests to

  • Allows secure https and websocket connections to Glance’s session servers at *

If the Content Security Policy relies on default-src to specify trusted protocols and hosts, the following can be added to default-src:

  • default-src


  • wss://*, https://*

If the Content Security Policy includes more specific directives:

  • connect-src wss://*, https://*;

  • style-src,

  • script-src,

  • img-src,

For additional information on CSP security, see Cobrowse Security Architecture.

You can also test whether Glance's session servers are accessible from your location. More instructions are available here

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