mirror of https://github.com/istio/istio.io.git
10 lines
553 B
Markdown
10 lines
553 B
Markdown
---
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title: Why can't Istio propagate headers instead of the application?
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weight: 10
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---
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Although an Istio sidecar will process both inbound and outbound requests for an associated application instance, it has no implicit way of correlating
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the outbound requests to the inbound request that caused them. The only way this correlation can be achieved is if the application
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[propagates relevant information](/docs/tasks/telemetry/distributed-tracing/overview/#understanding-what-happened) (i.e. headers) from the inbound
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request to the outbound requests.
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