Security Headers Guide: CSP, HSTS, X-Frame-Options, and More
Every HTTP security header explained: what it does, the right configuration for each, and how to test your header implementation.
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Tags: security, web, best-practices
HTTP Security Headers: CSP, HSTS, and X-Frame-Options HTTP security headers are directives the server sends in response headers that tell the browser how to behave when handling your application. They are one of the cheapest, highest-impact security improvements you can make to an existing application — a few lines of server configuration can eliminate entire classes of attacks. This guide covers the most important headers and how to configure them correctly. Content-Security-Policy (CSP) CSP is the most powerful and most complex security header. It tells the browser which sources of content (scripts, styles, images, fonts, frames) are trusted. An injected tag pointing to an attacker's server is useless if CSP prohibits loading scripts from that origin. Key directives: : Baseline — only…
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