Is ajax cached?

Is ajax cached? Is ajax cached? I mean, for example, there are no cache-like operations for the same request? You do not need to query the database! Is php used for data caching ?, You can use js on the client. If the same request directly retrieves the data in the cache. Php is also acceptable ., I think this problem exists if ajax is cached. When you transfer data ajax, is there a cache?
Is ajax cached? I mean, for example, there are no cache-like operations for the same request? You do not need to query the database! Is data cache implemented using php?

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You can use js on the client. If the same request directly retrieves the data in the cache.

Of course, php is also possible.
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I think this problem exists if ajax is cached. When you transmit data, you can use time as a variable for transmission. This avoids cache generation.
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You can cache the ajax request page on the client for XX seconds.

Set the Etag Cache-Control Expires and other information to Control the Cache time.

In addition, do not add Math. random () to ajax requests ()
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By default, IE has a cache. when you call the same URL, the cache is directly returned for the second time, and no operation is performed on the server. Firefox and Google Wood.

However, you can set it. for example, when setting a URL with a random number, or set cache-control to no cache.