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Preventing open proxy abuse: allowlists, quotas, and monitoring
Public relay endpoints attract scanners within minutes—design deny-by-default policies.
1 min read
securityproxyabuse
Deny by default
Only permit upstream hosts and paths your product explicitly supports.
Block private IP ranges and metadata endpoints at the edge to reduce SSRF risk.
Signals of abuse
Sudden jumps in 4xx from a single key may indicate credential sharing or a leaked key.
Geo anomalies and unusual user agents warrant automated slow-downs or key rotation.