Content-Security-PolicyHTTP response header using Express.
By using the Express API, we can use the
set method of the Express
res.set("Content-Security-Policy", "default-src 'self'");
Your policy will go inside the second argument of the
set method of the Express Response object.
As we saw above it is quite simple to set the header yourself, but if you are looking for some additional features there are some express middleware modules that support CSP:
If you're not sure what
default-src 'self'; means, then check out the Content Security Policy reference for details.