Variant for use in browsers about zipkin-js

[eirslett]

I think we should be able to refactor the code base a little bit, so you can pass in a context API as a constructor argument instead of hard-coding to CLS. That would make it more universal. We could e.g. use AngularJS Zones for the browser part.

We need to build a zipkin-transport-http first, since I think http is the only viable option for sending trace data from the browser.

There are also some other problems, like how to protect zipkin-server from potentially malicious requests, if it's exposed to the wide Internet?

[codefromthecrypt]

There are also some other problems, like how to protect zipkin-server from
potentially malicious requests, if it's exposed to the wide Internet?

good point in general, though it isn't necessarily something we need to
address at the same time since there's a use case for tracing internal or
otherwise vpn'd apps. wanna open an issue in zipkin-java? we can start
collecting practice.