Function selectDeflate

accept.go:278–294

(extensions []websocketExtension, mode CompressionMode)

}

func selectDeflate(extensions []websocketExtension, mode CompressionMode) (*compressionOptions, bool) {
	if mode == CompressionDisabled {
		return nil, false
	}
	for _, ext := range extensions {
		switch ext.name {
		// We used to implement x-webkit-deflate-frame too for Safari but Safari has bugs...
		// See https://github.com/nhooyr/websocket/issues/218
		case "permessage-deflate":
			copts, ok := acceptDeflate(ext, mode)
			if ok {
				return copts, true
			}
		}
	}
	return nil, false
}

func acceptDeflate(ext websocketExtension, mode CompressionMode) (*compressionOptions, bool) {
	copts := mode.opts()