simple_phantomjs_http_client.js

function get(url, mimeType, successCallback, errorCallback) {
    var page = require("webpage").create(),
        basePageMatch = /^(https?:)?\/\/[^\/]+/.exec(url),
        basePage = basePageMatch ? basePageMatch[0] : url;

    // HACK for relative protocol support
    if (basePage.indexOf("//") === 0) {
        basePage = "http:" + basePage;
    }

    page.open(basePage, function(status) {
        if (status !== 'success') {
            errorCallback("internal error");
            return;
        }

        page.onConsoleMessage = function (msg) {
            var params;
            try {
                params = JSON.parse(msg);
            } catch (e) {
                console.log("Error: Can't understand internal command " + msg + " : " + e);
                return;
            }

            if (params.status === 'success') {
                successCallback(params.content);
            } else {
                errorCallback();
            }
        };

        page.evaluate(function (url, mimeType) {
            var ajaxRequest = new window.XMLHttpRequest(),
                repond = function (status, content) {
                    console.log(JSON.stringify({
                        status: status,
                        content: content
                    }));
                };
            ajaxRequest.addEventListener("load", function () {
                if (ajaxRequest.status === 200 || ajaxRequest.status === 0) {
                    repond('success', ajaxRequest.response);
                } else {
                    repond('error');
                }
            }, false);

            ajaxRequest.addEventListener("error", function () {
                repond('error');
            }, false);

            ajaxRequest.open('GET', url, true);
            if (mimeType) {
                ajaxRequest.overrideMimeType(mimeType);
            }
            try {
                ajaxRequest.send(null);
            } catch (err) {
                repond('error');
            }
        }, url, mimeType);
    });
}