Failed to load resource: net::ERR_CONNECTION_REFUSED
<p>I am using this function to invoke the REST request, however, whenever I use the button to invoke this function, I get a connection refused. May I know how do I bypass this problem?</p>

<pre><code>function getContacts() {
    var settings = {
        "async": true,
        "crossDomain": true,
        "url": "http://localhost:5000/chaincode",
        "method": "POST",
        "headers": {
            "cache-control": "no-cache",
            "postman-token": "827ed81a-b8b4-d6a5-7e2c-e36f955b7423"
        },
        "data": "{\r\n  \"jsonrpc\": \"2.0\",\r\n  \"method\": \"query\",\r\n  \"params\": {\r\n      \"type\": 1,\r\n      \"chaincodeID\":{\r\n          \"name\":\"mycc\"\r\n      },\r\n      \"ctorMsg\": {\r\n         \"function\":\"query\",\r\n         \"args\":[\"a\"]\r\n      }\r\n  },\r\n  \"id\": 1\r\n}"
    }

    $.ajax(settings).done(function (response) {
        console.log(response);
    });
}
</code></pre>