Ajax Request not triggering success, Response 200

I am trying to request data by ajax from ripe.net, but the ajax request never triggers the success function, even through I get an http Response 200. My current code looks like this:

$.ajax({
    headers: {
        Accept : "application/json; charset=utf-8",
    },
    type: 'GET',
    url: 'http://rest.db.ripe.net/search',
    data: {
        'source' : 'ripe',
        'query-string': '172.217.16.67',
        'type-filter': 'inetnum'
    },
    success: function(res) {
        console.log(res);
    }
});

(I changed the IP to google.com)

Currently I've tried the following things:

set no headers (I need to set a header with Accept : "application/json" because I need the JSON format

set the header in beforeSend

set dataType to json

set dataType to jsonp (throws an error)

set dataType to text

set contentType to "application/json; charset=utf-8"

add crossDomain: true

add processData: false

None of the above worked for me. Do you have an idea why the success function isn't called, or what i am doing wrong?

Edit: The Requestheaders are:

Host: rest.db.ripe.net
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0
Accept: application/json; charset=utf-8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: ...
Origin: ...
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache

The Responseheaders are:

Date: Thu, 21 Dec 2017 11:15:54 GMT
Server: Jetty(9.3.z-SNAPSHOT)
Content-Type: application/json; charset=utf-8
Cache-Control: no-cache, no-store, must-revalidate
Pragma: no-cache
Expires: 0
Content-Encoding: gzip
Keep-Alive: timeout=15, max=100
Content-Length: 1148
Accept-Ranges: none
Connection: keep-alive

链接地址: http://www.djcxy.com/p/39200.html

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