Fix AppSec/IAST context dropped when trace.propagation.behavior.extract=ignore/restart#11666
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…ct=ignore/restart With IGNORE or RESTART, CoreSpanBuilder nulls the remote TagContext parent before buildSpanContext reaches the instanceof TagContext branch that copies requestContextDataAppSec/requestContextDataIast. The AppSec context is lost and GatewayBridge callbacks no-op, silently bypassing WAF/RASP for all inbound requests in AppSec-enabled services configured to ignore distributed tracing extraction. Fix: promote the AppSec/IAST data from the TagContext into the builder fields before nulling the parent. The builder-field path in buildSpanContext applies these after the parent is gone, preserving the request context while still correctly dropping trace identifiers and sampling priority. Fixes: APMSP-3198 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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What This Does
Preserves request context regardless of trace propagation configuration
Motivation
When trace.propagation.behavior.extract is set to ignore or restart, AppSec and IAST request context was not being propagated to the root span.
trace.propagation.behavior.extract=ignoreorrestart,CoreSpanBuilder.startnulls the remoteTagContextparent beforebuildSpanContextreaches theinstanceof TagContextbranch that copiesrequestContextDataAppSec/requestContextDataIastinto theDDSpanContext.DDSpanContextends up with null AppSec context, causing everyGatewayBridgecallback to returnNoopFlow.INSTANCE— silently bypassing WAF/RASP for all inbound requests in AppSec-enabled services configured to ignore distributed tracing extraction. IAST is similarly affected.TagContextinto the builder fields (builderRequestContextDataAppSec/builderRequestContextDataIast), whichbuildSpanContextapplies after the parent is gone. Trace identifiers and sampling priority are still correctly dropped.Test plan
CoreSpanBuilderTest.appSecContextPreservedFromTagContextWithIgnoreBehavior— asserts AppSec/IAST context survivesextract=ignoreCoreSpanBuilderTest.appSecContextPreservedFromTagContextWithRestartBehavior— same forextract=restart./gradlew :dd-trace-core:test --tests "datadog.trace.core.CoreSpanBuilderTest.appSecContext*"Fixes: APMSP-3198
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