伊斯蒂奥。谁生成初始 Zipkin HTTP headers？
Istio. Who generates the initial Zipkin HTTP headers?
文档中解释说，您的服务必须重新发送一组 headers 才能使 pilot/Zipkin 关联信息。
但是谁生成了第一个 headers 并设置了它的值？ Istio Ingress 控制器？
如何配置它，enable/disable？
谢谢。
Istio sidecar 代理 (Envoy) 生成第一个 headers。根据 https://www.envoyproxy.io/docs/envoy/latest/configuration/http_conn_man/headers#x-request-id：
Envoy will generate an x-request-id header for all external origin requests (the header is sanitized). It will also generate an x-request-id header for internal requests that do not already have one.
文档中解释说，您的服务必须重新发送一组 headers 才能使 pilot/Zipkin 关联信息。
但是谁生成了第一个 headers 并设置了它的值？ Istio Ingress 控制器？
如何配置它，enable/disable？
谢谢。
Istio sidecar 代理 (Envoy) 生成第一个 headers。根据 https://www.envoyproxy.io/docs/envoy/latest/configuration/http_conn_man/headers#x-request-id：
Envoy will generate an x-request-id header for all external origin requests (the header is sanitized). It will also generate an x-request-id header for internal requests that do not already have one.