Dynamic Web TWAIN – Content-Security-Policy violated

If your server has Content-Security-Policy enabled, you might get an error when accessing a web scanning page using Dynamic Web TWAIN.

CSP14312: Resource violated directive 'default-src 'self' 'unsafe-inline' 'unsafe-eval'' in Content-Security-Policy: wss:// Resource will be blocked.

In such cases, you will need to modify your Content-Security-Policy settings to allow the loading of Dynamic Web TWAIN JS files like dynamsoft.webtwain.initiate.js, dynamsoft.webtwain.config.js. etc.

More information can be found on

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