CSP errors and warnings (Content Security Policy)

This page will be a parent for reference articles about CSP errors and warnings, and will provide an overview of them, and generic troubleshooting advice, if possible.

• The page’s settings blocked the loading of a resource: %1$S
• The page’s settings blocked the loading of a resource at %2$S (“%1$S”).
• A violation occurred for a report-only CSP policy (“%1$S”). The behavior was allowed, and a CSP report was sent.
• The page’s settings observed the loading of a resource at %2$S (“%1$S”). A CSP report is being sent.
• Tried to send report to invalid URI: “%1$S”
• couldn’t parse report URI: %1$S
• Couldn’t process unknown directive ‘%1$S’
• Ignoring unknown option %1$S
• Ignoring duplicate source %1$S
• Ignoring source ‘%1$S’ (Not supported when delivered via meta element).
• Ignoring “%1$S” within script-src or style-src: nonce-source or hash-source specified
• Ignoring “%1$S” within script-src: ‘strict-dynamic’ specified
• Ignoring source “%1$S” (Only supported within script-src).
• Keyword ‘strict-dynamic’ within “%1$S” with no valid nonce or hash might block all scripts from loading
• The report URI (%1$S) should be an HTTP or HTTPS URI.
• This site (%1$S) has a Report-Only policy without a report URI. CSP will not block and cannot report violations of this policy.
• Failed to parse unrecognized source %1$S
• An attempt to execute inline scripts has been blocked
• An attempt to apply inline style sheets has been blocked
• An attempt to call JavaScript from a string (by calling a function like eval) has been blocked
• Upgrading insecure request ‘%1$S’ to use ‘%2$S’
• Ignoring srcs for directive ‘%1$S’
• Interpreting %1$S as a hostname, not a keyword. If you intended this to be a keyword, use ‘%2$S’ (wrapped in single quotes).
• Not supporting directive ‘%1$S’. Directive and values will be ignored.
• Blocking insecure request ‘%1$S’.
• Ignoring ‘%1$S’ since it does not contain any parameters.
• Ignoring sandbox directive when delivered in a report-only policy ‘%1$S’
• Referrer Directive ‘%1$S’ has been deprecated. Please use the Referrer-Policy header instead.
• Ignoring ‘%1$S’ because of ‘%2$S’ directive.
• Couldn’t parse invalid source %1$S
• Couldn’t parse invalid host %1$S
• Couldn’t parse scheme in %1$S
• Couldn’t parse port in %1$S
• Duplicate %1$S directives detected. All but the first instance will be ignored.
• Directive ‘%1$S’ has been deprecated. Please use directive ‘worker-src’ to control workers, or directive ‘frame-src’ to control frames respectively.
• Couldn’t parse invalid sandbox flag ‘%1$S’