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API Rate Limiting Bypass — API Reference

Libraries

Library Install Purpose
requests pip install requests HTTP request sending with custom headers

Rate Limit Response Headers

Header Description
X-RateLimit-Limit Maximum requests per window
X-RateLimit-Remaining Requests remaining in window
X-RateLimit-Reset Timestamp when limit resets
Retry-After Seconds to wait before retrying
RateLimit-Policy IETF draft rate limit policy

IP Spoofing Bypass Headers

Header Description
X-Forwarded-For Standard proxy forwarding header
X-Real-IP NGINX real client IP
X-Originating-IP Client originating IP
X-Client-IP Client IP identifier
True-Client-IP Akamai/CDN client IP
CF-Connecting-IP Cloudflare client IP
Forwarded RFC 7239 forwarded header

Bypass Techniques

Technique Description Severity
Header IP rotation Rotate X-Forwarded-For per request HIGH
HTTP method switching GET rate-limited but POST is not MEDIUM
Path variation /api/users vs /api/users/ MEDIUM
Case variation /API/Users vs /api/users MEDIUM
URL encoding %2Fapi%2Fusers instead of /api/users MEDIUM
Null byte injection Append %00 to URL path HIGH
API version switching /v1/users vs /v2/users MEDIUM
Parameter pollution Duplicate query parameters MEDIUM

OWASP API4:2023 — Unrestricted Resource Consumption

Risk Description
Missing rate limits No throttling on sensitive endpoints
Per-IP only limits Bypassed with header spoofing
No auth-based limiting Rate limit tied to IP, not user
Inconsistent enforcement Different limits per method/version

External References