I am using `libcurl` library to fetch `abc-1.tar` file from server. I want to know meaning of message which is display and process of execution of `libcurl` to display this messages. 

For Example: I provide some messages below out of that I know basic message meaning like `Content-Length` means length of file which are downloaded, etc. 

I want meaning of all messages, particularly messages which are start with `*` (e. g. `Connection #0 to host (nil) left intact`)

```
* Re-using existing connection! (#0) with host (nil)
* Connected to (nil) (182.72.67.14) port 65101 (#0)
GET /...... HTTP/1.1
Host: 182.72.67.14:65101
Accept: */*
Connection:keep-alive
< HTTP/1.1 200 OK
< Cache-Control: private
< Content-Length: 186368
< Content-Type: application/x-tar
< Server: Microsoft-IIS/7.5
< Content-Disposition: attachment; filename=abc-1.tar
< X-AspNet-Version: 4.0.30319
< X-Powered-By: ASP.NET
< Date: Tue, 01 Oct 2013 06:29:00 GMT
< 
* Connection #0 to host (nil) left intact

```