如何使用 express 启用 cors nodejs? [英] How to enable cors nodejs with express?
问题描述
总而言之，我正在使用称为基石的 dicom 文件的 api 之类的查看器，为此我连接到 dc4chee 的 WADO 服务以获取 dicom，dcm4chee 运行端口 8080，而我在节点上的应用程序使用端口 3000，所以我是试图显示浏览器的 dicom.
In summary I am using a viewer like api of dicom files called cornerstone, for this I connect to the WADO service of dc4chee to get the dicom, dcm4chee runs port 8080, and my application on node uses port 3000, so I am trying to show The browser's dicom.
https://www.npmjs.com/package/cornerstone-wado-图像加载器
这是浏览器显示的错误
XMLHttpRequest can not load http: // localhost: 8080 / wado? RequestType = WADO & studyUID = 1.2.840.113704.1.111.5 ... 26513.429 & contentType = application% 2Fdicom & transferSyntax = 1.2.840.10008.1.2. In 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http: // localhost: 3000' is therefore not allowed access.
在指定的文档中
注意Web服务器必须支持跨源资源共享，否则图片加载失败.如果您无法在要从中加载 DICOM P10 实例的 Web 服务器上启用 CORS，则可以使用反向代理.这是一个基于 http-proxy 的简单 Node.js，它添加了您可能会觉得有用的 CORS 标头.
Note that the web server must support Cross source resource sharing or the image will fail to load. If you are unable to get CORS enabled on the web server you are loading DICOM P10 instances from, you can use a reverse proxy. Here's a simple Node.js based on http-proxy that adds CORS headers that you might find useful.
并显示此示例代码，但我使用的是 express 而此代码不起作用
And show this example code but I'm using express and this code does not work
Var http = require ('http'),
HttpProxy = require ('http-proxy');
Var proxy = httpProxy.createProxyServer ({target: 'http: // localhost: 8042'}) .listen (8000);
Proxy.on ('proxyRes', function (proxyReq, req, res, options) {
// add the CORS header to the response
Res.setHeader ('Access-Control-Allow-Origin', '*');
});
Proxy.on ('error', function (e) {
// suppress errors
});
这里也使用 npm cors 代码
Also use npm cors here the code
Var express = require ('express')
Var cors = require ('cors')
Var app = express ()
App.get ('/ products /: id', cors (), function (req, res, next) {
Res.json ({msg: 'This is CORS-enabled for a Single Route'))
})
App.listen (80, function () {
Console.log ('CORS-enabled web server listening on port 80')
})
但是有了这个，我在端口 3000 而不是 8080 上启用了 cors，我需要在标头响应中而不是在标头请求中激活或添加Access-Control-Allow-Origin"的模式，
But with this I enable the cors on port 3000 and not the 8080, I need the mode to activate or add 'Access-Control-Allow-Origin in headers response and not in header request,
如何在 dcm4chee 从 NODEjs 运行的端口 8080 上添加 CORS?
How can I do to add CORS on port 8080 where dcm4chee runs from NODEjs?
更新！
服务器响应如下；
响应头
Content-Type:application/dicom
Date:Sat, 01 Apr 2017 01:15:38 GMT
Expires:0
Server:Apache-Coyote/1.1
Transfer-Encoding:chunked
X-Powered-By:Servlet 2.4; JBoss-4.2.3.GA (build: SVNTag=JBoss_4_2_3_GA
date=200807181439)/JBossWeb-2.0
请求头
Accept:*/*
Accept-Encoding:gzip, deflate, sdch, br
Accept-Language:es-ES,es;q=0.8,en-US;q=0.6,en;q=0.4
Connection:keep-alive
Host:localhost:8080
Origin:http: //localhost:3000
Referer:http: //localhost:3000/
User-Agent:Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like
Gecko) Chrome/55.0.2883.87 Safari/537.36
如何在响应头中启用CORS??
HOW TO ENABLE THE CORS IN RESPONSE HEADER??
推荐答案
do
npm install cors --save
然后将这些行添加到您的请求所在的主文件中.
and just add these lines in your main file where your request is going.
const cors = require('cors');
const express = require('express');
const app = express();
app.use(cors());
app.options('*', cors());
这篇关于如何使用 express 启用 cors nodejs?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
