feat: add TLD-level domain failover #276
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sesky4 wants to merge 11 commits intoTencentCloud:masterfrom
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feat: add TLD-level domain failover #276sesky4 wants to merge 11 commits intoTencentCloud:masterfrom
sesky4 wants to merge 11 commits intoTencentCloud:masterfrom
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Adds EndpointFailoverInterceptor that automatically retries against backup TLDs (.cn, .com.cn) when the primary tencentcloudapi.com domain fails due to DNS, TLS verification, or network reachability issues. The interceptor recovers all signing inputs from the outgoing Request and re-signs against the backup host using credentials/profile read live from the owning AbstractClient, so credential rotation is honoured on every retry. No per-request tag is required. Per-TLD CircuitBreakers (60s timeout) suppress repeated attempts against a failing TLD and probe recovery via half-open. Failover is opt-out via ClientProfile.setDomainFailover(false).
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Failover toggle now lives on HttpProfile alongside other transport-layer options (apigwEndpoint, timeouts, proxy). EndpointFailoverInterceptor and its breaker timeout constant are package-private — users opt out solely via HttpProfile.setDomainFailover(false), not by touching the interceptor.
Reprobe the user's original Tencent Cloud API domain after the breaker cooldown so traffic can automatically return once the primary TLD recovers. Add coverage for the cooldown-based reprobe path while keeping the existing preference for the last known working TLD before cooldown expires.
Unsigned V3 endpoints still need TLD rewrite when primary domain fails, so treat `Authorization: SKIP` as rewrite-only instead of excluding it from failover eligibility.
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