Are the results different if the user-supplied parameters are different? Perhaps you could use a proxy front-end module from your web server to provide this function. I believe that Apache mod_rewrite has an example of this for automatically generating files in a cache.

Alternatively, you could save the output, before sending it to the client, as a file based on some unique, per-request generated file name. Do not base the file name on any unsanitized data, or it could become an avenue for exploitation.

A third option might be to store the response text in a blob field in a database.

Each option has benefits and drawbacks, but without further information, it is difficult to even recommend an approach to take.

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