Having spent the last three weeks in a rigorous benchmarking cycle for our mobile API, we identified a critical and persistent source of latency variance: Radware's application security policies were aggressively flagging legitimate traffic from our latest mobile app release. The root cause was a combination of non-standard, developer-defined HTTP headers and unconventional session token patterns that, while perfectly valid for our use case, fell outside Radware's default threat signatures. This resulted in a 7-8% false positive block rate, skewing our performance metrics and causing user escalations.
After methodical testing with our security operations team, we developed a tuned configuration that maintains security posture while allowing our specific traffic patterns. The solution hinges on creating a custom URL-based policy with relaxed signature thresholds for our API endpoints, rather than applying global relaxations.
Here is the core structure of our refined policy, focusing on the HTTP Header Compliance and Session Abuse protections:
```
1. Create a new Security Policy (e.g., "Mobile-API-v2-Allowlist").
2. Define the policy scope using a precise URL wildcard pattern:
* URL Pattern: `/api/v2/mobile/data/**`
3. Under "Headers Compliance":
* Disable "Check Request Headers" for the following custom headers:
- X-Client-Meta
- X-Session-Chain-ID
* Note: These headers contain serialized binary data in Base64, which triggered "Invalid Header Format" signatures.
4. Under "Session Abuse":
* Adjust "Maximum Sessions per IP" upward (we set to 75 from default 50).
* Our app uses rapid, short-lived sessions for background sync, which appeared as session flooding.
5. Under "Signature Detection" (Advanced Settings):
* Create an exception for Signature ID 12345 (Generic Header Manipulation) for the scoped URL.
* Create an exception for Signature ID 67890 (Abnormal Session Pattern) for the scoped URL.
* Crucial: Apply exceptions ONLY to the above URL pattern.
```
Validation was performed by replaying 24 hours of production traffic logs (sanitized) through a test Radware instance with the new policy. The results were clear:
* **Pre-Tuning:**
* False Positive Block Rate: 7.3%
* Average Latency Increase (blocked requests): 1420ms (timeout + retry)
* P95 Latency for `/api/v2/mobile/data`: 856ms
* **Post-Tuning:**
* False Positive Block Rate: 0.2%
* Average Latency Increase: 0ms
* P95 Latency for `/api/v2/mobile/data`: 212ms
The key insight is granularity. A global change to header checking would have introduced risk. By scoping the relaxations to the exact endpoints exhibiting the unique mobile app behavior, we preserved the default security profile for our web and management interfaces. Always couple such tuning with a monitoring plan—we implemented a weekly audit log review for any anomalies on the scoped URLs.
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