Operating guide

Test whether a proxy adds, removes, rewrites or leaks HTTP request headers with controlled baselines, canaries and buying thresholds.

Diagnose intermittent proxy connection failures caused by client or NAT source-port pressure, measure TIME_WAIT and connection churn, and plan safe capacity without retry storms.

Migrate destination allowlists from old proxy exit IPs to new pools safely with overlap, canaries, evidence, rollback thresholds, and post-change verification.

A practical runbook for monitoring proxy gateway TLS certificates, rehearsing renewal, rotating safely, and diagnosing trust, hostname, chain, and connection-reuse failures.

Validate multi-region proxy routing, fallback order, location accuracy, session boundaries and cost before production traffic depends on it.

Test HTTP/2 proxy multiplexing, connection reuse, authentication boundaries and 421 recovery without mixing tenant or session state.

Audit GeoIP release age, application caches, IPv4 and IPv6 coverage, confidence and fallbacks before relying on proxy locations in production.

Build a repeatable NO_PROXY test matrix for hostnames, ports, IPv4, IPv6 and CIDR rules, then prove traffic follows the intended route.

Diagnose stale proxy gateway DNS safely with a layered test for authoritative records, local caches, connection pools, IPv4, IPv6 and failover.

Measure residential proxy inventory retention, replacement quality and market drift after purchase with repeatable cohort and overlap tests.