wget sometimes cannot receive Content-Encoding: gzip

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Linux

encoding

Use wget as follows：

wget --header="accept-encoding: gzip" www.elong.com --server-response –spider

output：

HTTP request sent, awaiting response...
  HTTP/1.1 200 OK
  Cache-Control: private
  Content-Length: 112581
  Content-Type: text/html; charset=utf-8
  Server: Microsoft-IIS/6.0
  X-Powered-By: ASP.NET
  X-AspNet-Version: 2.0.50727
  Set-Cookie: com.eLong.CommonService.OrderFromCookieInfo=Pkid=50&Parentid=50000&Coefficient=0&Status=1&Priority=8000&Makecomefrom=0&Savecookies=0&Cookiesdays=0&Isusefparam=0&Orderfromtype=1; domain=elong.com; path=/
  Set-Cookie: CookieGuid=6a620d53-677c-4aab-8ddf-5de0339778cf; domain=elong.com; expires=Fri, 22-Jul-2016 10:06:11 GMT; path=/
  Set-Cookie: SessionGuid=a41826f2-48c6-478b-ab01-9c17f657380a; domain=elong.com; path=/
  Set-Cookie: TLTHID=9154768A429F54A651C5529BC1236B80; Path=/; Domain=.elong.com
  Set-Cookie: TLTSID=9154768A429F54A651C5529BC1236B80; Path=/; Domain=.elong.com
  Set-Cookie: TLTUID=9154768A429F54A651C5529BC1236B80; Path=/; Domain=.elong.com expires=Mon, 22-07-2023 10:06:11 GMT
  Set-Cookie: TLTCNT=BHB-OWEBHOME20000000000185544
  Date: Mon, 22 Jul 2013 10:06:11 GMT
  Connection: keep-alive
  Set-Cookie: NSC_usbwfm_80=ffffffffaf1d122545525d5f4f58455e445a4a423660;expires=Mon, 22-Jul-2013 10:35:38 GMT;path=/;httponly
Cookie coming from www.elong.com attempted to set domain to elong.com expires=Mon, 22-07-2023 10:06:11 GMT
Length: 112581 (110K) [text/html]

I cannot find Content-Encoding: gzip


But If I use chrome or some other browser to visit www.elong.com , I can see the response header contains Content-Encoding: gzip

HTTP/1.1 200 OK
Cache-Control: private
Date: Mon, 22 Jul 2013 10:02:31 GMT
Content-Type: text/html; charset=utf-8
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
X-AspNet-Version: 2.0.50727
Set-Cookie: TLTHID=392F678544C27DEC6704ABBDB6D14EF2; Path=/; Domain=.elong.com
Set-Cookie: TLTCNT=CAB-OWEBHOME10000000000217162
Content-Encoding: gzip
Vary: Accept-Encoding
Transfer-Encoding: chunked

Is it a bug of wget or some other reason?


thx