How do I set my CSP header?
Some websites don't allow resources from a different domain, other than that of itself, to be loaded. If you want your website to have Mopinion feedback forms it can be necessary to add HTTP headers. For more information on Content Security Policy headers please see https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP.
Content Security Policy (CSP) header
Below you will find the domain Mopinion uses and an example of how this should be defined in Nginx.
script-src | https://*.mopinion.com | ‘unsafe-inline' OR ‘nonce-{{YOUR-NONCE}}’ OR load from separate source* |
style-src | https://*.mopinion.com https://fonts.googleapis.com | ‘unsafe-inline' OR ‘nonce-{{YOUR-NONCE}}’ |
frame-src | https://*.mopinion.com |
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connect-src | http://*.mopinion.com |
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img-src | https://*.mopinion.com |
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font-src | 'self' data: https://*.mopinion.com https://fonts.gstatic.com |
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* The 'unsafe-inline' setting is only needed when the script is loaded inline in the HTML of the page. When using a tag manager or loading the script from a file ‘unsafe-inline’ can be removed from the CSP.
Example in Nginx:
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add_header Content-Security-Policy "script-src 'self' 'unsafe-inline' https://*.mopinion.com; style-src 'self' https://*.mopinion.com https://fonts.googleapis.com; frame-src https://*.mopinion.com; connect-src https://*.mopinion.com; font-src 'self' data: https://*.mopinion.com https://fonts.gstatic.com;";Using a Nonce:
For the style-src a nonce needs to be available on the page. This can be added to the Mopinion script if this is the only script for which a nonce is used. If the nonce is already used it will automatically be picked up by the Mopinion script.
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<script nonce="{{nonce}}">
...Mopinion script
</script>
If a separate nonce is used for the style-src and it’s not used elsewhere on the page add the nonce as follows.
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<script nonce="{{nonce}}" data-style-nonce="{{stylenonce}}">
...Mopinion script
</script>
CORS header
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<IfModule mod_headers.c>
<FilesMatch "\.(ttf|ttc|otf|eot|woff| woff2|font.css|css|js)$">
Header set Access-Control-Allow-Origin "*.mopinion.com"
</FilesMatch>For more information on Cross-Origin Resource Sharing (CORS) please see this article about CORS at MDN web docs.