The additional information need to correlate request and response in the HTTPR asynchronous (or pseudo-synchronous) environment is put into the HTTPR message context header.
And for those that want to use a pseudo-synchronous style over an asynchronous channel, please, please, please, see Bobby Woolf's book on Designing Messaging Systems.
对于想要通过异步通道使用伪同步方式的读者，请查阅bobby Woolf关于设计消息传递系统的书籍。
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Currently there exist several asynchronous measurement fusion algorithms, namely, firstly strict synchronizing sensors asynchronous data and deal with them with parallel or pseudo-sequential filter.