[tracking issue] Ability to trace web apps

[yurishkuro]

Currently Jaeger does not directly support starting traces from the web browsers, although it is theoretically possible by using zipkin-js client (however it would force the rest of the services into zipkin's B3 headers).

The following is required:

• Jaeger client for Javascript (Extract base Javascript client from jaeger-client-node jaeger-client-javascript#1)
• Define canonical JSON model Define canonical JSON model #706 (depends on Use Protobuf and gRPC for internal communications #773)
• Jaeger collector to be able to accept Jaeger spans in JSON format (depends on Define canonical JSON model #706)
• Example / documentation

The user application that would serve the Web app would either need to set up CORS headers to allow Jaeger client to submit traces to a different address, or to proxy those submissions to Jaeger collector.

[pavolloffay]

Closing this as we are not planning to work on client libraries anymore. This functionality should be available in OpenTelemetry collector.