Advanced Intercept Techniques

Conditional breakpoints improve efficiency by intercepting only relevant traffic. Configure break points to trigger on specific URLs, methods, or header values. This targeted approach prevents constant interruption while browsing to interesting functionality. For example, set breakpoints only on POST requests to focus on form submissions, or specific API endpoints during testing.

Response modification enables sophisticated testing scenarios. Enable response break points to modify server responses before they reach your browser. Common uses include removing JavaScript validation to test server-side controls, modifying role indicators to test client-side authorization, or injecting payloads into responses to test for stored XSS. Response modification reveals whether applications rely on client-side security controls.

Sequential request analysis identifies multi-step vulnerabilities. Some security flaws only manifest through specific request sequences. Use ZAP's session tracking to understand request flow, then manually replay sequences with modifications. Race condition testing requires sending parallel requests with precise timing. ZAP's Requester tool enables such complex testing scenarios.