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# Client-Server example.
This example shows a `Span` created by a `Client`, which will send a `Message`/`SpanContext` to a `Server`, which will in turn extract such context and use it as parent of a new (server-side) `Span`.
`Client.send()` is used to send messages and inject the `SpanContext` using the `TEXT_MAP` format, and `Server.process()` will process received messages and will extract the context used as parent.
```python
def send(self):
with self.tracer.start_active_span('send') as scope:
scope.span.set_tag(tags.SPAN_KIND, tags.SPAN_KIND_RPC_CLIENT)
message = {}
self.tracer.inject(scope.span.context,
opentracing.Format.TEXT_MAP,
message)
self.queue.put(message)
```
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