Simulate a request for an image. the request header contains range, but why does the returned content-range field not exist?

This is the request header {code...}. this is the response header {code...}. he directly returned a complete image. as expected, this is the request header.

GET http://subversion.apache.org/images/windows.png HTTP/1.1Host: subversion.apache.orgRange: 1000-3000Content-Length: 14Pragma: no-cache

This is the response header

HTTP/1.1 200 OKDate: Sun, 28 Aug 2016 01:33:56 GMTServer: Apache/2.4.7 (Ubuntu)Last-Modified: Thu, 14 Jan 2010 21:29:52 GMTETag: "1403-47d2696640237"Accept-Ranges: bytesContent-Length: 5123Content-Type: image/pngCache-Control: no-cache

He directly returned a complete image. as expected, only partial images are returned.

Reply content:

This is the request header

GET http://subversion.apache.org/images/windows.png HTTP/1.1Host: subversion.apache.orgRange: 1000-3000Content-Length: 14Pragma: no-cache

This is the response header

HTTP/1.1 200 OKDate: Sun, 28 Aug 2016 01:33:56 GMTServer: Apache/2.4.7 (Ubuntu)Last-Modified: Thu, 14 Jan 2010 21:29:52 GMTETag: "1403-47d2696640237"Accept-Ranges: bytesContent-Length: 5123Content-Type: image/pngCache-Control: no-cache

He directly returned a complete image. as expected, only partial images are returned.