Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote
<p>I am trying to make an api call in jquery but I am getting this error 
<code>Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://api.ontraport.com/1/objects?objectID=5&amp;start=50. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).</code></p>

<p>But in firebug I can see my request header</p>

<pre><code>Accept : */*
Accept-Encoding : gzip, deflate, br
Accept-Language : en-US,en;q=0.5
Access-Control-Allow-Orig... : *
Api-Appid : 2_z0j1
Api-Key : 2AsywN80
Host :api.ontraport.com
Origin: https://ruby-on-rails-amankumarglobussoft.c9users.io
Referer : https://ruby-on-rails-amankumarglobussoft.c9users.io/aman
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
</code></pre>