ClientSpanObserver returns a ClientOption that observes the span for the client-side span.

ClientTrace returns a ClientOption that turns on or off extra instrumentation via httptrace.WithClientTrace.

ComponentName returns a ClientOption that sets the component name for the client-side span.

InjectSpanContext returns a ClientOption that turns on or off injection of the Span context in the request HTTP headers.

OperationName returns a ClientOption that sets the operation name for the client-side span.

TraceRequest adds a ClientTracer to req, tracing the request and all requests caused due to redirects.

TracerFromRequest retrieves the Tracer from the request.

RequestIDHeaderKey 补充的RequestID Header Key.

Tracer holds tracing details for one HTTP request.

Transport wraps a RoundTripper.

ClientOption contols the behavior of TraceRequest.