[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Tracing](./puppeteer.protocol.tracing.md) > [StartRequest](./puppeteer.protocol.tracing.startrequest.md) > [streamCompression](./puppeteer.protocol.tracing.startrequest.streamcompression.md) ## Protocol.Tracing.StartRequest.streamCompression property Compression format to use. This only applies when using `ReturnAsStream` transfer mode (defaults to `none`) Signature: ```typescript streamCompression?: StreamCompression; ```