Decompressing a gzipped http response

Question

Hello fellow java developers. I receive a response with headers and body as below, but when I try to decompress it using the code below, it fails with this exception:

java.io.IOException: Not in GZIP format

Response:

HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Encoding: gzip
Server: Jetty(6.1.x)
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eY\╛P?#5wÑqc╙τ♦▓½Θt£6q∩?┌4┼t♠↕=7æƒ╙?╟|♂;║)∩÷≈═^╛{v⌂┌∞◄>6ä╝|

Code:

byte[] b=  IOUtils.toByteArray(sock.getInputStream());

ByteArrayInputStream bais = new ByteArrayInputStream(b);
GZIPInputStream gzis = new GZIPInputStream(bais);
InputStreamReader reader = new InputStreamReader(gzis);
BufferedReader in = new BufferedReader(reader);

String readed;
while ((readed = in.readLine()) != null) {
    System.out.println("read:  "+readed);
}

Please advise.

Thanks,

Pradeep

Answer 1

The MIME header is NOT in the GZIP format, it's in plain text. You have to read that first before you can decompress the stream.

Also, why not just use this:

InputStream in = sock.getInputStream();
readHeader(in);
InputStream zin = new GZIPInputStream(in);