如何将 createProxyMiddleware 与嵌套逻辑一起使用

Question

/node_modules/http-proxy/lib/http-proxy/index.js:120; Error: socket hang up

上一个Post：

我正在尝试使用 createProxyMiddleware({ target: serviceProvider}) 而不是 apiProxy.web(req, res, {target: serviceProvider});。浏览器挂起并且不显示任何内容（不过我在选项卡中看到了旋转）

如何正确使用 createProxyMiddleware 和如下所示的嵌套代码库？

这是源代码。

app.get('/source*',
    function(req, res, next) {
        req.query.RelayState = req.url;
        if(req.user) { // if user is authenticated,
            if(req.originalUrl) {
                resource_path = req.originalUrl.split('/source')[1];
                console.log(req.user['email'] + ' is viewing ' + req.originalUrl);
            }
            createProxyMiddleware({ target: serviceProvider})
            // apiProxy.web(req, res, {target: serviceProvider});
        } else {
            if(process.env.MODE=='HACK') {
              createProxyMiddleware({ target: serviceProvider})
              // apiProxy.web(req, res, {target: serviceProvider});
            } else {
              passport.authenticate('samlStrategy')(req, res, next);
            }
        }
    },
);

之间，这个有效：app.get('/source*', createProxyMiddleware({ target: serviceProvider}))

Answer 1

问题是代理中间件已创建但并未实际调用，因此请求挂起。解决这个问题的一种方法是像您一样创建中间件（但最好在路由处理程序之外，因为它会在每个请求上创建），然后使用当前 express 中间件的参数调用它：

const serviceProviderProxy = createProxyMiddleware({target: serviceProvider }); 

    app.get('/source*', (req, res, next) => {
        req.query.RelayState = req.url;
        if (req.user) { // if user is authenticated,
            if (req.originalUrl) {
                resource_path = req.originalUrl.split('/source')[1];
                console.log(req.user['email'] + ' is viewing ' + req.originalUrl);
            }
            return serviceProviderProxy.call(serviceProviderProxy, req, res, next); // you need to return here if there's more code below the else block, otherwise return is not needed
        } else {
            if(process.env.MODE=='HACK') {
               return serviceProviderProxy.call(serviceProviderProxy, req, res, next);              
            } else {
               passport.authenticate('samlStrategy')(req, res, next);
            }
        }
        // potential more code ... 
    });

如何将 createProxyMiddleware 与嵌套逻辑一起使用

How do I use createProxyMiddleware with the nested logic

javascript

http-proxy

express

passport.js

http-proxy-middleware