mirror of https://github.com/istio/istio.io.git
10 lines
692 B
Markdown
10 lines
692 B
Markdown
---
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title: Why can't Istio propagate headers instead of the application?
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weight: 20
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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 (i.e. headers) from the inbound request to the outbound requests. Header propagation may be accomplished through client
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libraries or manually. Further discussion is provided in [What is required for distributed tracing with Istio?](/help/faq/distributed-tracing/#how-to-support-tracing).
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