curl: show header only / http get

If you only want to show the headers of your http response, you may want to use the following switches:

```
-D = dump headers
```
```
-s = silent mode
```

-o /dev/null = send all output do dev null

The curl request looks like this:

$ curl -s -D - https://www.path.to/my.file -o /dev/null

The output should looks like this:

HTTP/2 200
last-modified: Tue, 13 Dec 2016 12:08:30 GMT
etag: W/"183836-1481630910000"
server: Apache
x-magnolia-registration: Registered
pragma: no-cache
content-type: application/x-font-otf;charset=UTF-8
content-length: 183836
accept-ranges: bytes
cache-control: public, max-age=8236
expires: Mon, 02 Jan 2017 13:11:32 GMT
date: Mon, 02 Jan 2017 10:54:16 GMT

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