QNetworkReply not showing Content-Length header

For some download urls the QNetworkReply object does not contain the Content-Length header and returns File Size as -1. I tested for the following url:

http://download-cf.jetbrains.com/webide/PhpStorm-EAP-141.332.tar.gz

The headers shown by Live HTTP Headers in Firefox are as follows:

HTTP/1.1 200 OK
Content-Type: application/x-tar
Content-Length: 135144452
Connection: keep-alive
Date: Mon, 30 Mar 2015 17:49:03 GMT
Content-Encoding: gzip
x-amz-meta-s3cmd-attrs: uid:572/gname:cds/uname:cds/gid:574/mode:33188/mtime:1427282503/atime:1427282968/md5:a2ccadce9ae0f356e9c11a6d5dd5a4f0/ctime:1427282503
Last-Modified: Wed, 25 Mar 2015 11:36:03 GMT
Etag: "db9a27ca51b84bac23080028b3e267ef-9"
Accept-Ranges: bytes
Server: AmazonS3
Age: 313
X-Cache: Miss from cloudfront
Via: 1.1 f94856caaa8ad33df4ddf975899fadd2.cloudfront.net (CloudFront)
X-Amz-Cf-Id: GFsaZTTMQ5eQ54JOUzBfJmIHL6AolKkXknb2HAcfbCKsbIYgdJng_Q==

And when I do following:

qDebug()<<reply->rawHeaderList();

The output is:

("Content-Type", "Connection", "Date", "Content-Encoding",
"x-amz-meta-s3cmd-attrs", "Last-Modified",
"ETag", "Accept-Ranges", "Server", "Age", "X-Cache",
"Via", "X-Amz-Cf-Id")

Clearly, Content-Length is missing. So, is their any solution for this.