HTTP headers | X-Frame-Options

HTTP headers are used to pass additional information with HTTP response or HTTP requests. The X-Frame-Options is used to prevent the site from clickjacking attacks. It defines whether or not a browser should be allowed to render a page in a <frame>, <iframe>, <embed> or <object>. The frame-ancestors directive present in Content-Security-Policy(CSP) obsoletes X-Frame-Options.

Syntax:

X-Frame-Options: directive

Directives:



  • deny: This directive stops the site from being rendered in <frame> i.e. site can’t be embedded into other sites.
  • sameorigin: This directive allows the page to be rendered in the frame iff frame has the same origin as the page.
  • allow-from uri: This directive has now became obsolete and shouldn’t be used. It is not supported by modern browser. In this the page can be rendered in the <frame> that is originated from specified uri.

Examples:

  • On Apache:
    To send the X-Frame-Options to all the pages of same originis, set this to your site’s configuration.

    Header always set X-Frame-Options "sameorigin"

    Open httpd.conf file and add the following code to deny the permission

    header always set x-frame-options "DENY"
  • On Nginx: Open the server configuration file and add the following code to allow only from same origin
    add_header x-frame-options "SAMEORIGIN" always;

Supported Browsers: The borwsers supoorted by X-Frame-Options are listed below:

  • Chrome
  • Internet Explorer
  • Safari
  • Firefox
  • Edge

Note: Only Internet Explorer and Microsoft Edge supports the allow-from directive.



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