AJAX Request to sharepoint REST API But receiving CORS error

I want to request a sharepoint server with ajax but I get an CORS error :
enter image description here

How can I solve this issue please

  $.ajax({
url: "http://myserver.com" + "/_api/web/Lists/GetByTitle('Documents')/items?$select=ID,Title,FileRef",
async: false,
crossDomain: true,
headers: {
    'accept': 'application/json;odata=nometadata'
},
complete: function(request) {
    console.log("Request: " + JSON.stringify(request, null, 4));
}, 
error: function(request) {
    console.log(JSON.stringify(request, null, 4));
}