Content Security Policy (CSP)
Content Security Policy (CSP) is a security feature that helps prevent attacks such as Cross-Site Scripting (XSS) and data injection by controlling which resources a web page is allowed to load. It works by defining a set of rules or directives in HTTP headers that specify the sources of content the browser should trust and execute.
Core Directives:
1. script-src: Controls the allowed sources for JavaScript.
2. style-src: Specifies the sources for CSS stylesheets.
3. img-src: Defines trusted sources for images.
4. default-src: Acts as a fallback for unspecified directives.
5. connect-src: Restricts the URLs for AJAX requests and WebSocket connections.
How CSP Works:
Server Configuration: The server sends CSP rules via HTTP headers or tags.
Browser Enforcement: The browser evaluates the rules and blocks or allows content based on the policy.
Violation Reports: CSP can log policy violations to a server for auditing and troubleshooting.
Benefits:
Prevention of XSS Attacks: Blocks malicious scripts injected into web pages.
Enhanced Control: Provides granular control over the types of content loaded on a site.
Improved Security Posture: Reduces the attack surface of web applications.
Compliance: Helps meet security standards like OWASP Top 10 and GDPR.
Challenges:
Implementation Complexity: Requires careful configuration to avoid blocking legitimate resources.
Compatibility Issues: Some older browsers may not fully support CSP.
Maintenance Overhead: As websites evolve, CSP policies need to be updated accordingly.
Use Cases:
Secure Web Applications: Protecting user data on e-commerce and banking platforms.
Content Integrity: Preventing unauthorized modifications to site content.
Compliance Standards: Enhancing adherence to cybersecurity regulations.
CSP is a powerful tool for improving web security, ensuring that only trusted content is executed within a web page, thus safeguarding both users and organizations from potential threats.
How CodeBranch applies Content Security Policy (CSP) in real projects
The definition above gives you the concept — but knowing what Content Security Policy (CSP) means is different from knowing when and how to apply it in a production system. At CodeBranch, we have spent 20+ years building custom software across healthcare, fintech, supply chain, proptech, audio, connected devices, and more. Every entry in this glossary reflects how our engineering, architecture, and QA teams actually use these concepts on client projects today.
Our work combines AI-powered agentic development, the Spec-Driven Development (SDD) framework, CI/CD pipelines with agent rules, and production-grade quality gates. Whether you are evaluating a technology for your product, trying to understand a vendor proposal, or simply learning, this glossary is written to give you practical, accurate context — not theoretical abstractions.
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