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I have a spring project where I need to compress the JSON response if the size of the response is greater that 2KB. Spring has the property server.compression.min-response-size=2048 but is only does it for response of type String. Recommendation from spring team as below

  • The minimum size is only honored if the size is known before the body is written, thanks to the "Content-Length" response header. If you really want to honor this is all cases, you would need to buffer the entire JSON response body and then write it at once; this is likely to make performance worse.*

What is the best way to achieve this if performance impact is not taken into consideration?

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  • Create filter, read response, put in byte array, after wards write to actual response including setting the content-length header. This will really impact performance and if you have large payloads could even lead to memory issues. Commented Dec 3, 2024 at 11:21
  • @M.Deinum how do i write the response to byte array. I tried creating a filter but the object HttpServletResponse does not have any method to get the response in byte array. Commented Dec 4, 2024 at 4:59
  • It has an outputstream, you would need to write a wrapper for the response that caches it instead of directly writing it. Commented Dec 4, 2024 at 6:35
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