Content Security Policy (CSP) is enforced by

Question

BlackTom AI · Accepted Answer

When considering who enforces Content Security Policy (CSP), it helps to trace where CSP is actively applied and enforced. 
Option 1: Mainstream Web Browsers. This is correct because CSP is a browser-side mechanism; browsers read the CSP directives sent by the server and enforce them by blocking or allowing resources. The enforcement happens at the browser level, not in server-side code or tooling. 
Option 2: Web frameworks. While some frameworks can help you set CSP headers or generate configurations, they do not enforce CSP by themselves. The actual enforcement occurs in the browser; frameworks merely facilitate correct header configuration. 
Option 3: PHP Runtime. The PHP runtime can emit CSP headers if a developer programs it to, but it does not enforce CSP on its own. Enforcement occurs when the client browser processes those headers. 
Option 4: Javascript Code. JavaScript can be restricted or affected by CSP, but the authority to enforce CSP resides in the browser. Malicious or compliant JS cannot implement CSP enforcement independently; they are subject to the directives the browser applies. 
In summary, CSP is a security policy delivered by your server and enforced by the client’s browser, with browsers acting as the enforcement point rather than frameworks, runtimes, or arbitrary code running on the server or in scripts alone.

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Content Security Policy (CSP) is enforced by

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