未定义的HTTP GET请求被Node.js服务器解释

我有一个问题与我的Node.js应用程序，我通过ajax调用客户端发送http get请求，然后我接收请求服务器端，并试图使用通过get请求发送的数据。我的问题是服务器说请求是未定义的。我完全不知道为什么会出现这种情况，因为我在其他页面上做其他类似的请求，它们工作得很好。

下面是我的错误信息:

/var/www/html/AdminExtension/extension/extension/node_modules/find/index.js:35
          throw err;
                ^
Error: ENOENT, lstat '/path/to/project/undefined'

"未定义"位应该是从请求中检索到的路径的其余部分。

这是我相关的app.js代码:

var express = require('express');
var MemoryStore = require('connect').session.MemoryStore;
var app = express();
app.set('port', process.env.PORT || 3333);
app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');
app.set('view options', {layout: false});
app.use(require('morgan')('dev'));
app.use(require('body-parser')({ keepExtensions: true}));
app.use(require('cookie-parser')());
app.use(require('express-session')({ secret: '12345678910', store: new MemoryStore({ reapInterval: 600000}) }));
app.use(require('method-override')());
app.use(function(req, res, next) {
        res.header("Access-Control-Allow-Origin", "*");
        res.header("Access-Control-Allow-Headers", "X-Requested-With");
        next();
});
app.use(express.static(path.join(__dirname, '/public')));
app.all('*', function (req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header('Access-Control-Allow-Methods', 'GET');
    next();
});
// Routes for browsing directories and listing contents
var browse = require('./routes/general/browse');
app.get('/browse/file/info', browse.getFileInformation);
app.listen(app.get("port"));

var path = require('path');
var fs = require('fs');
exports.getFileInformation = function(request, response) {
    var filePath = "/folder1/folder2/" + request.body.filePath;
    console.log('*' + filePath + '*');
    checkFileInfo(
            filePath,
            function(err, fileInfo) {
                if (err)
                    console
                            .log("An error has occured when trying to retrieve the file information: "
                                    + err);
                else
                    response.send(fileInfo);
            });
};
function checkFileInfo(filePath, callback) {
    fs
            .lstat(
                    filePath,
                    function(err, stats) {
                        if (err)
                            return callback(err);
                        else if (stats && stats.isFile()) {
                            var fileInfo = {};
                            fileInfo.size = stats.size;
                            fileInfo.created = stats.ctime;
                            fileInfo.modified = stats.mtime;
                            fileInfo.accessed = stats.atime;
                            callback(null, fileInfo);
                        } else
                            return callback("The path provided did not lead to an accessible file.");
                    });
}

和客户端ajax请求:

var obj = {
    filePath : "/relative/path/this_is_a_file.txt"
};
$.ajax({
    type : "GET",
    url : serverUrl + '/browse/file/info',
    data : obj,
    dataType : 'json',
    success : function(fileData) {
        // Do something else
    }
});