Binary gzip string not in correct gzip format

var output = pako.gzip(“{test:‘hello world’}”, { to: ‘string’ });

fs.writeFile("./gzip-test.txt", output, function(err) {
  if(err) {
    return console.log(err);
  }

  console.log("The file was saved!");
});

Produces this output in a file:

1F C2 8B 08 00 00 00 00 00 00 03 C2 AB 2E 49 2D 2E C2 B1 52 C3 8F 48 C3 8D C3 89 C3 89 57 28 C3 8F 2F C3 8A 49 51 C2 AF 05 00 37 C2 90 12 C3 89 14 00 00 00

According to this:

http://en.wikipedia.org/wiki/Gzip

The output should start with a 1F 8B. It has a C2 in there, otherwise it looks good. I am trying to gzip a big block of JSON in the browser and send it to the backend. The Java backend is throwing an error saying that this is not in GZip format.

[patrickliechty]

I had the same issue when trying to send the data to the server from the browser. I fixed it by doing this:

    headers["Content-Encoding"] = "gzip";
    var gzippedJson = gzip.gzip("{test:'hello world'}");
    //If you use charset=x-user-defined-binary it just sends the data through as is.
    //  If you don't do this, it uses utf-8 which adds extra characters and thus is not in gzip format
    var gzippedBLob = new Blob([gzippedJson], {type: "application/json; charset=x-user-defined-binary"});
   xhr.send(gzippedBlob);

[blacelle]

Hello, I allow myself resurrecting this thread. Here is a Java snippet to handle pako String:

// Convert from pako String format to raw byte[]
byte[] asByteArray = new byte[html.length()];
for (int i = 0; i < html.length(); i++) {
	asByteArray[i] = (byte) html.charAt(i);
}
// Unzip the byte[]
try (GZIPInputStream gzipInputStream = new GZIPInputStream(new ByteArrayInputStream(asByteArray));
		InputStreamReader osw = new InputStreamReader(gzipInputStream, StandardCharsets.UTF_8)) {
	html = CharStreams.toString(osw);
}

Pako provided the string with:

data.html = pako.gzip(data.html, { to: 'string' });