When it comes to CORS, "incompatibility" and restrictions are something we can not ignore.
An alternative way is to use a php file as an intermediary, playing a proxy role.
You can use CURL:
<?php
//Proxy.php
$curl = curl_init();
$url = 'http://www.dominioexterno.com.br/acao/';
$header[0] = "Accept: text/xml,application/xml,application/xhtml+xml,";
$header[0] .= "text/html;q=0.9,text/plain;q=0.8,image/png,image/jpeg,image/jpg,image/gif,*/*;q=0.5";
$header[] = "Cache-Control: max-age=0";
$header[] = "Connection: keep-alive";
$header[] = "Keep-Alive: 300";
$header[] = "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7";
$header[] = "Accept-Language: pt-BR,en-US,en,pt;q=0.5";
$header[] = "Pragma: ";
curl_setopt($curl, CURLOPT_URL, $url );
curl_setopt($curl, CURLOPT_HEADER, 0);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_VERBOSE, 1);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, TRUE);
curl_setopt($curl, CURLOPT_POST, TRUE);
curl_setopt($curl, CURLOPT_POSTFIELDS, array('param' => 'value'));
$reponse = curl_exec( $curl );
curl_close( $curl );
echo $reponse;
curl_setopt($curl, CURLOPT_POST, TRUE);
Here the request was set to POST
curl_setopt($curl, CURLOPT_POSTFIELDS, array('param' => 'value'));
.
and here are the parameters param=value