This class implements a stream which compresses data into the zlib format (RFC 1950).
zlib
The compression level can be specified, as a symbolic value identical to what the Deflater class expects. The default compression level is MEDIUM.
Deflater
MEDIUM
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outputStream = getOutputStream(outputStream); String acceptEncoding = getRequest().getHeader("Accept-Encoding"); if (acceptEncoding != null && acceptEncoding.contains("deflate")) { getResponse().setHeader("Content-Encoding", "deflate"); outputStream = new DeflaterOutputStream(outputStream); } writer = new OutputStreamWriter(outputStream, "UTF-8"); if (logger.isTraceEnabled()) {