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Compression Configuration

Main Article: Response Compression

Small streams generally do not benefit from being compressed; there is overhead when using compression, not just the CPU time to compress the bytes, but a lot of overhead. For small responses, Tapestry does not attempt to compress the output stream.

The configuration symbol tapestry.min-gzip-size allows the cutoff to be set; it defaults to 100 bytes.

In addition, some file types are already compressed and should not be recompressed re-compressed (they actually get larger, not smaller!). The service ResponseCompressionAnalyzer's configuration is an unordered collection of content type strings that should not be compressed. The default content types are "image/jpeg".NOT compressed are:

• image/* (image/jpeg, image/png, image/gif, etc) except image/svg+xml, which is compressed
• application/x-shockwave-flash
• application/font-woff
• application/x-font-ttf
• application/vnd.ms-fontobj

StreamResponse

When returning a StreamResponse from a component event method, the stream is totally under your control; it will not be compressed. You should use the ResponseCompressionAnalyzer service to determine if the client supports compression, and add a java.util.zip.GZIPOutputStream to your stream stack if compression is desired.