Let's support at least reading "b3" header from a single string, most commonly traceid-spanid-1
It would also be nice to support optionally writing this, especially in message providers or others with constrained environments.

Expected behavior

As discussed on openzipkin/b3-propagation#21 and first implemented here: https://github.com/openzipkin/brave/blob/master/brave/src/main/java/bra

Currently we don't have any mechanism to limit the maximum number of clients that could be handled simultaneously.

This feature should be designed properly. Here is some clue: https://redis.io/topics/clients#maximum-number-of-clients

It's useful model for extend the expiration automatically sometime.
I haven't found related infomation about this feature.
Would you consider to support this feature?

建议BaseRepository 里增加返回 IQueryable 的Get / GetAsync 的方法
有了之后就可以在service 里面进行拼接LINQ 用于获取到ViewModel中关联其他类的数据

When using SimpleMemoryBackend, should be important set the max size of internal dict

an idea is use an algorithm to select what to do when dict is "full", remove last element, first, random, rlu ...

Get能否类似post设置request Header,现在貌似没有提供