[code=golang]
import (
    "bytes"
    "compress/gzip"
)

func gzencode(str string) ([]byte, error) {
    // Create a bytes.Buffer to store the compressed data
    var buf bytes.Buffer

    // Create a gzip.Writer to write the compressed data to buf
    gz := gzip.NewWriter(&buf)

    // Write the original string to the gzip.Writer
    _, err := gz.Write([]byte(str))
    if err != nil {
        return nil, err
    }

    // Close the gzip.Writer to flush the buffer to buf
    err = gz.Close()
    if err != nil {
        return nil, err
    }

    // Return the compressed data
    return buf.Bytes(), nil
}
[/code]