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Dutch Open Projects: Content Security Policy and Drupal

Error message

User error: Failed to connect to memcache server: localhost:11212 in dmemcache_object() (line 415 of /home/freedrup/public_html/demo/d7/sites/all/modules/memcache/dmemcache.inc).

What is CSP?

Content Security Policy – or CSP – is a security feature of modern browsers. Browsers will ignore data from domains that are not cleared in the CSP http-response header. For instance if you embed a YouTube movie on a webpage and the domain is not whitelisted in the CSP header, then the movie will not be loaded. All traffic from youtube.com will be blocked and the movie cannot be displayed.

Source: 
https://dop.nu/blog/content-security-policy-and-drupal