External Ajax URL Request

Question

I am with following problem,I implemented the code,to get information from RSS blog,however I am not able to access url criticizing error 401,when I place local file works normally.

var ajax = new XMLHttpRequest();

    ajax.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            console.log("Dados" + ajax.responseText);
            startComunicado(this);
        }
    };
    ajax.open("GET", "http://www.infomoney.com.br/blogs/investimentos/off-the-records/rss", true);
    ajax.send();
};

Answer 1

Do it this way

                  $.ajax({
                    type: 'GET',
                    crossDomain: true,
                    data: form,
                    dataType: 'json',
                    url: 'http://www.infomoney.com.br/blogs/investimentos/off-the-records/rss',


                    success: function (dados) {
                        if (dados != null) {

                           //fazer o que quiser
                        }

                    },
                    error: function () {
                        console.log("Falha de enviar AJAX");
                    }
                })

Answer 2

The mistake Status Code 401 happens when you make a request, but you are not allowed.

Already the error cited in the comment of the previous reply:

"Failed to load infomoney.com.br/blogs/investimentos/off-the-records/rss: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'localhost'; is therefore not allowed access."

It happens due to lack of header Access-Control-Allow-Origin on the server response.

To get around this, you can use the site https://cors.io/. It will serve as an intermediary and will automatically add the header necessary.

Example with Fetch:

fetch("https://cors.io/?http://www.infomoney.com.br/blogs/investimentos/off-the-records/rss")
    .then( resp => resp.text() )
    .then(resp => console.log(resp))
    .catch( err => console.debug(err) );

Example with XHR:

var ajax = new XMLHttpRequest();

ajax.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
        console.log(ajax.responseText);
    }
};
ajax.open("GET", "https://cors.io/?http://www.infomoney.com.br/blogs/investimentos/off-the-records/rss", true);
ajax.send();