CODEWITHSUNDEEP
javagzip
Bill
Bill

Reputation: 363

Decompressing a gzipped http response

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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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

Upvotes: 8

Views: 6901

Answers (3)

Koshinae
Koshinae

Reputation: 2330

I second bmarguiles' answer.

Only the body (response-body in the RFC) is compressed, so you only need to decompress the part that is after the \r\n\r\n.

Generally speaking, you can cut the response in half by that double CRLF, and only decompress the second half.

Upvotes: 0

bmargulies
bmargulies

Reputation: 100196

There are libraries for all of this. You can use, for example, Apache HTTP Components, or you can read its open source to see what it does. At very least, read the relevant specification.

Upvotes: 1

Leo Izen
Leo Izen

Reputation: 4289

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);

Upvotes: 2

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