Fetch directive

{{Glossary("CSP")}} fetch directives are used in a {{HTTPHeader("Content-Security-Policy")}} header and control locations from which certain resource types may be loaded. For instance, {{CSP("script-src")}} allows developers to allow trusted sources of script to execute on a page, while {{CSP("font-src")}} controls the sources of web fonts.

All fetch directives fall back to {{CSP("default-src")}}. That means, if a fetch directive is absent in the CSP header, the user agent will look for the default-src directive.

See Fetch directives for a complete list.

See also

• Related glossary terms:
  • {{Glossary("CSP")}}
  • {{Glossary("Reporting directive")}}
  • {{Glossary("Document directive")}}
  • {{Glossary("Navigation directive")}}
• Reference
  • Fetch directives specification
  • {{HTTPHeader("Content-Security-Policy/upgrade-insecure-requests", "upgrade-insecure-requests")}}
  • {{HTTPHeader("Content-Security-Policy/block-all-mixed-content", "block-all-mixed-content")}}
  • {{HTTPHeader("Content-Security-Policy")}}