How does an API work?

How will API determine which response corresponds to each user when two people with the same API key ask different questions simultaneously in VS Code?

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Basically, the API key is only used to determine whether or not the client can use the model, so a response should be returned for each question.
When using a model via the API, it also means that it does not have a function to store the response content, so if you need to store it, you will need to devise a way to do so. For example, you could pass the previous question and answer.

I’d like to understand how an API identifies which user is asking a question and ensures it responds only to that user, especially when multiple requests are sent to the API at the same time. How does it prevent mixing up responses between my questions and my friend’s questions

I’m sure there are many explanations of the concept of a normal API on the internet, so I’ll skip that, but here’s an example.
Basically, the server processes requests received in a queue in order, so even if requests are made at the same time, the server processes them separately, so there are no problems. There is no risk of them being mixed up, or rather, it would be difficult to prepare a mechanism for properly mixing them up, so it’s unlikely to happen.
Of course, it is also possible to mix information from multiple users, as in this forum for example, as a general network technology. It is a database. However, I don’t think there is a model like that in the API currently being made public by Hugging Face.

Each API request is unique, even if the same key and IP address are used. The server code is asynchronous, meaning it can handle multiple requests simultaneously. For each API request, a separate instance of the code is executed. To put it simply, it’s like a single customer account placing two orders at a restaurant at the same time, but from different locations.

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