FromContext returns the trace ID associated with the context.

FromHTTPRequestHeader retrieves the trace ID from an HTTP Request.

NewContext stores the trace ID value in the context if not already present.

SetHTTPRequestHeaderFromContext set the trace ID HTTP Request Header with the value retrieved from the context.

DefaultHeader is the default header name for the trace ID.

DefaultLogKey is the default log field key for the Trace ID.

DefaultValue is the default trace ID value.