NOTE: Read carefully how this header works before using it.Strict-Transport-Security: max-age=63072000 includeSubDomains preload The HTTP Strict-Transport-Security response header (often abbreviated as HSTS) lets a website tell browsers that it should only be accessed using HTTPS, instead of using HTTP.

Please read Session Management Cheat Sheet for a detailed explanation on cookie configuration options.This is not a security header per se, but its security attributes are crucial. To send multiple cookies, multiple Set-Cookie headers should be sent in the same response. The Set-Cookie HTTP response header is used to send a cookie from the server to the user agent, so the user agent can send it back to the server later. NOTE: the text/html can be any of the possible MIME types.NOTE: the charset attribute is necessary to prevent XSS in HTML pages.an image) may be interpreted as HTML, making XSS vulnerabilities possible.Īlthough it is recommended to always set the Content-Type header correctly, it would constitute a vulnerability only if the content is intended to be rendered by the client and the resource is untrusted (provided or modified by a user). The Content-Type representation header is used to indicate the original media type of the resource (before any content encoding is applied for sending). NOTE: For more information on configuring this header please see Mozilla Referrer-Policy.Referrer-Policy: strict-origin-when-cross-origin However, since not all users may be using the latest browsers we suggest forcing this behavior by sending this header on all responses. Today, the default behavior in modern browsers is to no longer send all referrer information (origin, path, and query string) to the same site but to only send the origin to other sites. Referrer policy has been supported by browsers since 2014. The Referrer-Policy HTTP header controls how much referrer information (sent via the Referer header) should be included with requests. X-Content-Type-Options: nosniff Referrer-Policy ¶ Set the Content-Type header correctly throughout the site. This header is used to block browsers' MIME type sniffing, which can transform non-executable MIME types into executable MIME types ( MIME Confusion Attacks). The X-Content-Type-Options response HTTP header is used by the server to indicate to the browsers that the MIME types advertised in the Content-Type headers should be followed and not guessed. Please see Mozilla X-XSS-Protection for details. Use a Content Security Policy (CSP) that disables the use of inline JavaScript.ĭo not set this header or explicitly turn it off. WARNING: Even though this header can protect users of older web browsers that don't yet support CSP, in some cases, this header can create XSS vulnerabilities in otherwise safe websites source. The HTTP X-XSS-Protection response header is a feature of Internet Explorer, Chrome, and Safari that stops pages from loading when they detect reflected cross-site scripting (XSS) attacks. Use Content Security Policy (CSP) frame-ancestors directive if possible.ĭo not allow displaying of the page in a frame. If the HTTP response is a redirect or an API returning JSON data, X-Frame-Options does not provide any security. X-Frame-Options header is only useful when the HTTP response where it is included has something to interact with (e.g. Sites can use this to avoid clickjacking attacks, by ensuring that their content is not embedded into other sites.Ĭontent Security Policy (CSP) frame-ancestors directive obsoletes X-Frame-Options for supporting browsers ( source). The X-Frame-Options HTTP response header can be used to indicate whether or not a browser should be allowed to render a page in a, , or. In this cheat sheet, we will review all security-related HTTP headers, recommended configurations, and reference other sources for complicated headers. Proper HTTP response headers can help prevent security vulnerabilities like Cross-Site Scripting, Clickjacking, Information disclosure and more. HTTP Headers are a great booster for web security with easy implementation. HTTP Security Response Headers Cheat Sheet ¶ Introduction ¶ Insecure Direct Object Reference Prevention Testing Proper Implementation of Security Headers Permissions-Policy (formerly Feature-Policy)Īdding HTTP Headers in Different Technologies

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