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The CRS provides a ready‑made collection of generic attack signatures. Watch how the rules are grouped (e.g., REQUEST-942-APPLICATION-ATTACK-XSS). Beginners often enable the entire CRS without adjusting the anomaly scoring, which can cause false positives.
In practice you start with the base CRS, then disable or tune rules that interfere with your application’s legitimate traffic. Knowing the rule IDs helps you write exceptions later.
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