node.js輕松搭建一個服務(wù)器

array_huang 發(fā)布于2019-08-23 13:42 / 1995人閱讀

摘要：前端獲取數(shù)據(jù)時經(jīng)常遇見跨域問題，以前一直用做反向代理。最近在用，發(fā)現(xiàn)的代理簡單好用。于是仿照寫了一個簡單的服務(wù)器，用于非的項目。交流學(xué)習(xí)圈交流學(xué)習(xí)圈

前端獲取數(shù)據(jù)時經(jīng)常遇見跨域問題，以前一直用nginx做反向代理。最近在用vuejs，發(fā)現(xiàn)webpack-dev-server的代理簡單好用。于是仿照寫了一個簡單的web服務(wù)器，用于非webpack的項目。

1 const request = require("request");
 2 const express = require("express");
 3 const path = require("path");
 4 
 5 const app = express();
 6 
 7 const proxyTable = {
 8   "/wcf": {
 9     target: " 
10   }
11 };交流學(xué)習(xí)圈582735936
12 
13 app.use(function(req, res,next) {
14   const url = req.url;
15   if (req.method == "OPTIONS") {
16       console.log("options_url: ", url);
17       
18       // res.header("Access-Control-Allow-Origin", req.headers.origin || "*");
19       // res.header("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With");
20       // res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
21       
22       // res.header("Access-Control-Allow-Credentials", true);
23 
24       res.status(200).send("OK");
25       return;
26   } 
27 
28   // console.log("req_url: ", url);
29   next();
30 });
31 
32 
33 app.use(express.static(path.join(__dirname, "static")));
34 
35 app.use("/", function(req, res) {
36   const url = req.url;
37   const proxy = Object.keys(proxyTable);
38   let not_found = true; 
39   for (let index = 0; index < proxy.length; index++) {
40     const k = proxy[index];
41     const i = url.indexOf(k);
42     if (i >= 0) {     
43       not_found = false;
44       const element = proxyTable[k];
45       const newUrl = element.target + url.slice(i+k.length);
46       req.pipe(request({url: newUrl, timeout: 60000},(err)=>{
47         if(err){
48           console.log("error_url: ", err.code,url);
49           res.status(500).send("");
50         }     
51       })).pipe(res);
52       break;
53     } 
54   }交流學(xué)習(xí)圈582735936
55   if(not_found) {
56     console.log("not_found_url: ", url);
57     res.status(404).send("Not found");
58   } else {
59     console.log("proxy_url: ", url);
60   }
61 });
62 
63 const PORT = 8080;
64 app.listen(PORT, () => {
65   console.log
66 });