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The traceparent field version (8-bit): trace context version that the system has adopted. The current is 00 . trace-id (16-byte array): the ID of the whole trace. It's used to identify a distributed trace globally through a system.

The traceparent header Identifies the request in a tracing system, describing the position of the incoming request in its trace graph in a portable, fixed-length format. format = version ?-? trace-id ?-? parent-id ?-? trace-flags e.g. ?00?0af7651916cd43dd8448eb211c80319c-b9c7c989f97918e1?01?

The traceparent request header represents the incoming request in a tracing system in a common format, understood by all vendors. Here's an example of a traceparent header. For example, say a client and server in a system use different tracing vendors: Congo and Rojo.

The tracestate header is intended to carry supplemental information to trace identity contained in the trace parent. tracestate consists of a list of key/value pairs that convey information about the request position in multiple distributed tracing graphs.

HTTP request tracing is a feature of IIS that provides a way to determine what exactly is happening with a request. This includes any form of authentication, which handler was used, and how long each step took in the pipeline. Enabling request tracing is a useful way to diagnose unexpected or undesirable behavior.

The main purpose of the tracestate HTTP header is to provide additional vendor-specific trace identification information across different distributed tracing systems and is a companion header for the traceparent field. It also conveys information about the request's position in multiple distributed tracing graphs.

Traceparent header format The traceparent header uses the version-trace_id-parent_id-trace_flags format where: version is always 00 . trace_id is a hex-encoded trace id. span_id is a hex-encoded span id.

Trace ID Format A trace_id consists of three numbers separated by hyphens. For example, 1-58406520-a006649127e371903a2de979 .