Fix httpclient-5.x plugin injecting sw8 headers into ClickHouse HTTP requests (#797) ClickHouse HTTP interface (port 8123) rejects unknown headers, causing HTTP 400 errors when SkyWalking Java agent injects sw8 propagation headers. Introduce PROPAGATION_EXCLUDE_PORTS config (default "8123") and update HttpClientDoExecuteInterceptor to skip tracing for excluded ports. Requests to other ports continue to be traced normally. Verified with ClickHouse JDBC queries.
SkyWalking-Java: The Java Agent for Apache SkyWalking, which provides the native tracing/metrics/logging abilities for Java projects.
SkyWalking: an APM(application performance monitor) system, especially designed for microservices, cloud native and container-based (Docker and Kubernetes) architectures.
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