Question

我想允许访问跨源调用，我需要能够对服务器执行其他API调用。

我的connect grunt任务配置如下：

    connect: {
  options: {
    port: 9000,
    // Change this to '0.0.0.0' to access the server from outside.
    hostname: 'localhost',
    livereload: 35729,
    middleware: function(connect, options, next) {
      return [
        function(req, res, next) {
          res.setHeader('Access-Control-Allow-Origin', '*');
          res.setHeader('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
          res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
          next();
        }
      ];
    }
  },
},

当我运行grunt服务器时，我得到Cannot GET /。没有中间件配置，应用程序正在运行，索引文件已正确加载。

你可以指导我做错我做错了吗？

关于我的gruntfile的更多细节是我使用yeoman angular seed app作为应用程序的基础。

Answer 1

尝试这样的事情：

connect: {
  options: {
    port: 9000,
    // Change this to '0.0.0.0' to access the server from outside.
    hostname: 'localhost',
    livereload: 35729,

    // remove next from params
    middleware: function(connect, options) {
      return [
        function(req, res, next) {
          res.setHeader('Access-Control-Allow-Origin', '*');
          res.setHeader('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
          res.setHeader('Access-Control-Allow-Headers', 'Content-Type');

          // don't just call next() return it
          return next();
        },

        // add other middlewares here 
        connect.static(require('path').resolve('.'))

      ];
    }
    },
    },

Answer 2

向bpaul点头，他让我走上正确答案的道路。对similar question的回复格式可以在此处使用。

替换＆＃39; next＆＃39;使用中间件，并在返回之前将您的匿名函数推送到中间件数组中：

middleware: function(connect, options, middlewares) {

    middlewares.unshift(function(req, res, next) {
        res.setHeader('Access-Control-Allow-Credentials', true);
        res.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
        res.setHeader('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');
        next();
    });

    return middlewares;
}

Answer 3

connect: {
  options: {
    port: 9000,
    // Change this to '0.0.0.0' to access the server from outside.
    hostname: 'localhost',
    livereload: 35729,
    middleware: function(connect, options, next) {
      return [
        function(req, res, next) {
         res.header('Access-Control-Allow-Credentials', true);
         res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
         res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');
         next();
      }];
     }
   };

这将帮助您获取Get-Control-Allow-Credentials

的来电

Answer 4

Grunt connect附带了多个中间件，作为函数存储在一个数组中。当您通过返回数组设置中间件时，您将覆盖负责为您的页面提供服务的现有中间件。

取消ansorensen对文档的评论，https://github.com/gruntjs/grunt-contrib-connect#middleware相关部分。

options: {
    middleware: function(connect, options, middlewares) {
      // inject a custom middleware into the array of default middlewares
      middlewares.unshift(function(req, res, next) {
        if (req.url !== '/hello/world') return next();

        res.end('Hello, world from port #' + options.port + '!');
      });

      return middlewares;
    },
},

数组中较早的中间件在数组之后的那些中生效。

所以你想要的是

connect: {
    options: {
        port: 9000,
        // Change this to '0.0.0.0' to access the server from outside.
        hostname: 'localhost',
        livereload: 35729,

        // remove next from params
        middleware: function(connect, options, middlewares) {
            middlewares.unshift(function(req, res, next) {
                res.setHeader('Access-Control-Allow-Origin', '*');
                res.setHeader('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
                res.setHeader('Access-Control-Allow-Headers', 'Content-Type');

                return next();
            });

            return middlewares;
        }
    },
},

Grunt连接任务和中间件Access-Control-Allow-Origin

4 个答案: