对于路由,我希望我的中间件将请求在/ html文件夹中定义的路由传递给服务器
HTML(ejs),如果头Content-Type是application / json,则使用/ api文件夹中定义的路由.
但我不想在每条路线中定义它.
所以我不是在寻找定义一些req.api属性的中间件,我可以在每个路由中检查它
app.get('/',function(req,res) { if(req.api_call) { // serve api } else { // serve html } });
但我喜欢这样的事情:
// HTML folder app.get('/',res) { res.send('hi'); }); // API folder app.get('/',res) { res.json({message: 'hi'}); });
这是可能的,如果是这样,我该怎么做?
我希望它能像这样工作:
app.use(checkApiCall,apiRouter); app.use(checkHTMLCall,htmlRouter);
解决方法@H_403_19@
您可以在Express链中插入第一个中间件,一个检查请求类型的中间件处理程序,然后通过向其添加前缀路径将req.url修改为伪URL.然后,此修改将强制该请求仅转到特定路由器(设置为处理该特定URL前缀的路由器).我已使用以下代码在Express中验证了此功能:
var express = require('express');
var app = express();
app.listen(80);
var routerAPI = express.Router();
var routerHTML = express.Router();
app.use(function(req,res,next) {
// check for some condition related to incoming request type and
// decide how to modify the URL into a pseudo-URL that your routers
// will handle
if (checkAPICall(req)) {
req.url = "/api" + req.url;
} else if (checkHTMLCall(req)) {
req.url = "/html" + req.url;
}
next();
});
app.use("/api",routerAPI);
app.use("/html",routerHTML);
// this router gets hit if checkAPICall() added `/api` to the front
// of the path
routerAPI.get("/",res) {
res.json({status: "ok"});
});
// this router gets hit if checkHTMLCall() added `/api` to the front
// of the path
routerHTML.get("/",res) {
res.end("status ok");
});
注意:我没有填写checkAPICall()或checkHTMLCall()的代码,因为您并没有完全具体说明您希望这些代码如何工作.我在自己的测试服务器中嘲笑它们,看看这个概念是否有效.我假设您可以为这些函数提供适当的代码或替换您自己的if语句.
事先答复
我刚刚确认您可以在Express中间件中更改req.url,因此如果您有一些修改req.url的中间件,它将影响该请求的路由.
// middleware that modifies req.url into a pseudo-URL based on
// the incoming request type so express routing for the pseudo-URLs
// can be used to distinguish requests made to the same path
// but with a different request type
app.use(function(req,next) {
// check for some condition related to incoming request type and
// decide how to modify the URL into a pseudo-URL that your routers
// will handle
if (checkAPICall(req)) {
req.url = "/api" + req.url;
} else if (checkHTMLCall(req)) {
req.url = "/html" + req.url;
}
next();
});
// this will get requests sent to "/" with our request type that checkAPICall() looks for
app.get("/api/",res) {
res.json({status: "ok"});
});
// this will get requests sent to "/" with our request type that checkHTMLCall() looks for
app.get("/html/",res) {
res.json({status: "ok"});
});
较旧的答案
我能够在这样的快递面前成功地发出请求回调,并且看到它成功地修改了传入的URL,然后影响快速路由,如下所示:
var express = require('express');
var app = express();
var http = require('http');
var server = http.createServer(function(req,res) {
// test modifying the URL before Express sees it
// this could be extended to examine the request type and modify the URL accordingly
req.url = "/api" + req.url;
return app.apply(this,arguments);
});
server.listen(80);
app.get("/api/",res) {
res.json({status: "ok"});
});
app.get("/html/",res) {
res.end("status ok");
});
这个例子(我测试过的)只是硬连线在URL的前面添加“/ api”,但您可以自己检查传入的请求类型,然后根据需要进行URL修改.我还没有探究是否可以完全在Express中完成.
在这个例子中,当我请求“/”时,我被赋予了JSON.
var express = require('express'); var app = express(); app.listen(80); var routerAPI = express.Router(); var routerHTML = express.Router(); app.use(function(req,res,next) { // check for some condition related to incoming request type and // decide how to modify the URL into a pseudo-URL that your routers // will handle if (checkAPICall(req)) { req.url = "/api" + req.url; } else if (checkHTMLCall(req)) { req.url = "/html" + req.url; } next(); }); app.use("/api",routerAPI); app.use("/html",routerHTML); // this router gets hit if checkAPICall() added `/api` to the front // of the path routerAPI.get("/",res) { res.json({status: "ok"}); }); // this router gets hit if checkHTMLCall() added `/api` to the front // of the path routerHTML.get("/",res) { res.end("status ok"); });
注意:我没有填写checkAPICall()或checkHTMLCall()的代码,因为您并没有完全具体说明您希望这些代码如何工作.我在自己的测试服务器中嘲笑它们,看看这个概念是否有效.我假设您可以为这些函数提供适当的代码或替换您自己的if语句.
事先答复
我刚刚确认您可以在Express中间件中更改req.url,因此如果您有一些修改req.url的中间件,它将影响该请求的路由.
// middleware that modifies req.url into a pseudo-URL based on // the incoming request type so express routing for the pseudo-URLs // can be used to distinguish requests made to the same path // but with a different request type app.use(function(req,next) { // check for some condition related to incoming request type and // decide how to modify the URL into a pseudo-URL that your routers // will handle if (checkAPICall(req)) { req.url = "/api" + req.url; } else if (checkHTMLCall(req)) { req.url = "/html" + req.url; } next(); }); // this will get requests sent to "/" with our request type that checkAPICall() looks for app.get("/api/",res) { res.json({status: "ok"}); }); // this will get requests sent to "/" with our request type that checkHTMLCall() looks for app.get("/html/",res) { res.json({status: "ok"}); });
较旧的答案
我能够在这样的快递面前成功地发出请求回调,并且看到它成功地修改了传入的URL,然后影响快速路由,如下所示:
var express = require('express'); var app = express(); var http = require('http'); var server = http.createServer(function(req,res) { // test modifying the URL before Express sees it // this could be extended to examine the request type and modify the URL accordingly req.url = "/api" + req.url; return app.apply(this,arguments); }); server.listen(80); app.get("/api/",res) { res.json({status: "ok"}); }); app.get("/html/",res) { res.end("status ok"); });
这个例子(我测试过的)只是硬连线在URL的前面添加“/ api”,但您可以自己检查传入的请求类型,然后根据需要进行URL修改.我还没有探究是否可以完全在Express中完成.
在这个例子中,当我请求“/”时,我被赋予了JSON.