mirror of https://github.com/istio/istio.io.git
7 lines
280 B
Markdown
7 lines
280 B
Markdown
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title: What generates the initial Zipkin (B3) HTTP headers?
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weight: 15
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---
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The Istio sidecar proxy (Envoy) generates the initial [headers](https://www.envoyproxy.io/docs/envoy/latest/configuration/http_conn_man/headers#x-request-id), if they are not provided by the request.
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