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# OpenTelemetry C++ Example
## HTTP
This is a simple example that demonstrates tracing an HTTP request from client
to server. The example shows several aspects of tracing such as:
* Using the `TracerProvider`
* Using the `GlobalPropagator`
* Span Attributes
* Span Events
* Using the ostream exporter
* Nested spans (TBD)
* W3C Trace Context Propagation
### Running the example
1. The example uses HTTP server and client provided as part of this repo:
* [HTTP
Client](https://github.com/open-telemetry/opentelemetry-cpp/tree/main/ext/include/opentelemetry/ext/http/client)
* [HTTP
Server](https://github.com/open-telemetry/opentelemetry-cpp/tree/main/ext/include/opentelemetry/ext/http/server)
2. Build and Deploy the opentelementry-cpp as described in
[INSTALL.md](../../INSTALL.md)
3. Start the server from the `examples/http` directory
```console
$ http_server 8800
Server is running..Press ctrl-c to exit...
```
4. In a separate terminal window, run the client to make a single request:
```console
$ ./http_client 8800
...
...
```
5. You should see console exporter output for both the client and server
sessions.
* Client console
```console
{
name : /helloworld
trace_id : baa922bc0da6f79d46373371f4416463
span_id : 83bed4da7a01267d
tracestate :
parent_span_id: 0000000000000000
start : 1620287026111457000
duration : 5164400
description :
span kind : Client
status : Unset
attributes :
http.header.Date: Thu, 06 May 2021 07:43:46 GMT
http.header.Content-Length: 0
http.status_code: 200
http.method: GET
http.header.Host: localhost
http.header.Content-Type: text/plain
http.header.Connection: keep-alive
http.scheme: http
http.url: h**p://localhost:8800/helloworld
events :
links :
}
```
* Server console
```console
{
name : /helloworld
trace_id : baa922bc0da6f79d46373371f4416463
span_id : c3e7e23042eb670e
tracestate :
parent_span_id: 83bed4da7a01267d
start : 1620287026115443300
duration : 50700
description :
span kind : Server
status : Unset
attributes :
http.header.Traceparent: 00-baa922bc0da6f79d46373371f4416463-83bed4da7a01267d-01
http.header.Accept: */*
http.request_content_length: 0
http.header.Host: localhost:8800
http.scheme: http
http.client_ip: 127.0.0.1:50792
http.method: GET
net.host.port: 8800
http.server_name: localhost
events :
{
name : Processing request
timestamp : 1620287026115464000
attributes :
}
links :
}
```
As seen from example above, `trace_id` and `parent_span_id` is propagated
from client to server.
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