构建块（二）
Building blocks
通过标准HTTP或gRPC api访问模块化最佳实践
Modular best practices accessible over standard HTTP or gRPC APIs
1. 服务到服务的调用 Service-to-service invocation
EndPoint
/v1.0/invoke
说明
服务调用使应用程序能够通过公开的端点以http或gRPC消息的形式相互通信。Dapr提供了一个端点，作为反向代理和内置服务发现的组合，同时利用内置的分布式跟踪和错误处理。
Service invocation enables applications to communicate with each other through well-known endpoints in the form of http or gRPC messages. Dapr provides an endpoint that acts as a combination of a reverse proxy with built-in service discovery, while leveraging built-in distributed tracing and error handling.
