The X-download _top_-options Http Header Is Not Set To Noopen May 2026

The X-Download-Options header was introduced by Microsoft for and later versions. By default, when a user downloads a file (like an HTML document) from a website, many browsers offer three options: Open , Save , and Cancel .

: Setting the header to noopen removes the "Open" option from the dialog box. This forces the user to save the file to their local machine first. When the user eventually opens the saved file, it runs in a local context (e.g., file:// ), which prevents it from interacting with your web domain's cookies or session data. Why Is It Still Relevant? the x-download-options http header is not set to noopen

Add the following line to your .htaccess file or main server configuration: Header set X-Download-Options "noopen" Use code with caution. You may need to ensure the mod_headers module is enabled. 2. Nginx Configuration Add this directive to your server or location block: What does `X-Download-Options: noopen` do? - Stack Overflow This forces the user to save the file