title: Is GZipStream header reliable across .NET versions?
body: <p>I came to the Q&amp;A <a href="https://stackoverflow.com/questions/4662821/is-there-a-way-to-know-if-the-byte-has-been-compressed-by-gzipstream/26234928#26234928">Is there a way to know if the byte[] has been compressed by gzipstream?</a> and some author states (and it's true) that <code>GZipStream</code> puts <code>{0x1f, 0x8b, 8, 0, 0, 0, 0, 0, 4, 0}</code> characters as header to know if a byte array is a compressed string.</p>
  
  <p>And my question is, <strong>is GZipStream header reliable across .NET versions?</strong></p>