shouldn't have a hard-dependency on a <1.0 api

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#621 创建于 2019年3月25日 10 条评论 0 个 reaction 已指派 0 人在 GitHub 查看

priority: p2 type: feature request

描述

Even when not using tracing, opencensus 0.18 types are required per this line in `HttpRequest`

```
/** OpenCensus tracing component. */
private final Tracer tracer = OpenCensusUtils.getTracer();
```

grpc code is more defensive to not require loading classes until used.

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