http - What is a request-response pair called? -

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For example in HTTP, you send a request and receive a response; Is there a name that describes the request-response?

I thought about "dialogue" or "conversation", although they show multiple requests-feedback pairs, while I am searching for a word that indicates exactly one.

The reason to ask is that I have to give the name of an object which explains the details of both, and the request response looks quite lame.

How about "exchange"?


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