Phil Clay created HTTPCLIENT-2423:
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Summary: Support trace context header propagation in
httpclient5-observation
Key: HTTPCLIENT-2423
URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2423
Project: HttpComponents HttpClient
Issue Type: Improvement
Components: HttpClient (classic)
Affects Versions: 5.6.1
Reporter: Phil Clay
The httpclient5-observation module does not provide a mechanism for propagating
tracing headers (e.g. {{traceparent}}) in outbound requests.
For reference, the old (deprecated) httpclient5 micrometer observation
instrumentation in the micrometer-core library [provided a context so that
headers would be
propagated|https://github.com/micrometer-metrics/micrometer/blob/e11e7c6b3e579c607393905732d3b9b1f5863e95/micrometer-core/src/main/java/io/micrometer/core/instrument/binder/httpcomponents/hc5/ApacheHttpClientContext.java#L60-L62].
The instrumentation from micrometer-core has been [deprecated in favor of the
instrumentation provided by
httpclient5-observation|https://github.com/micrometer-metrics/micrometer/issues/7158].
Unfortunately, the httpclient5-observation instrumentation does not propagate
trace context via headers. Therefore, users switching from micrometer-core to
httpclient5-observation will lose functionality.
This enhancement request is to add the appropriate context and header
propagation mechanism to the httpclient5-observation module, so that users
migrating from micrometer-core instrumentation to httpclient5-observation
instrumentation will retain header propagation functionality.
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