Key takeaway
Tune WAF rules to normal application behavior and review blocked requests regularly.
What traffic a WAF inspects
A WAF generally evaluates HTTP(S) requests and responses in an application-layer context. Rule sets inspect request format and behavior and may block or log known patterns such as SQL injection and cross-site scripting attempts. Results depend on traffic, where encryption terminates and how rules are tuned.
Deployment and rule tuning
A WAF may sit in front of an application as a proxy, cloud service or hosted control. Roll out new or changed rules in the following sequence while keeping existing controls active.
Stage and test
Test new or changed rules against normal and expected malicious requests in an authorized staging environment.
Observe bounded matches
Observe only those rules’ production matches within a defined scope and period; keep existing controls active.
Tune false positives
Check legitimate API and user flows, narrow exceptions and retest.
Enable scoped blocking
Enable approved rules gradually, monitor results and performance and retain a working rollback path.
Connect WAF to application security
A WAF does not fix vulnerable code and may not recognize every application attack. Use it with secure development, patch management, identity controls, API schema validation and application logs. Track rule updates, exceptions, incident triage and performance impact.