druid/docs/content/operations/http-compression.md

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HTTP Compression

Druid supports http request decompression and response compression, to use this, http request header Content-Encoding:gzip and Accept-Encoding:gzip is needed to be set.

General Configuration

Property	Description	Default
druid.server.http.compressionLevel	The compression level. Value should be between [-1,9], -1 for default level, 0 for no compression.	-1 (default compression level)
druid.server.http.inflateBufferSize	The buffer size used by gzip decoder. Set to 0 to disable request decompression.	4096