问grunt连接代理:创建了代理，但我得到了404

EN

var proxySnippet = require('grunt-connect-proxy/lib/utils').proxyRequest;
module.exports = function (grunt) {
    ...
    grunt.initConfig({
        ...
        connect: {
            ...
            server: {
                proxies: [
                {
                     context: '/api',
                     host: 'somevirtualhost',
                     port: 8080,
                     https: false,
                     changeOrigin: true
                }
                ]
            },
            livereload: {
                options: {
                    open: true,
                    middleware: function (connect) {
                        return [
                            proxySnippet,
                            ...
                        ];
                    }
                }
            },
            ...
        },
    });
    ...
    grunt.registerTask('serve', 'Compile then start a connect web server', function (target) {
        ...
        grunt.task.run([
            ...
            'configureProxies:server',
            ...
        ]);
    });
}

var Versions = $resource('/api/version/:versId', { versId: '@id' });
var version = Versions.get({ versId: 'Ultra' }, function () {
    console.log('here I am');
});

Running "configureProxies:server" (configureProxies) task
Proxy created for: /api to somevirtualhost:8080

Failed to load resource: the server responded with a status of 404 (Not Found)
http://localhost:9000/api/version/Ultra