How Can I Enable CORS for my Node.js Express Server to Access DICOM Files from a Different Port?

CORS and Node.js with Express

When using a viewer like cornerstone-wado-image-loader to fetch DICOM files from a WADO service running on a different port than your Node.js application, cross-origin resource sharing (CORS) is crucial to prevent browser errors related to 'Access-Control-Allow-Origin' header issues.

Enabling CORS with Express

Express provides an easy way to enable CORS. Follow these steps:

1. Add the cors package to your project:

   npm install cors --save

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2. Import the cors package and add it as middleware to your Express app in your main file where the request is being made:

   const cors = require('cors');
   const express = require('express');
   const app = express();
   
   // Add CORS middleware to enable CORS on all routes
   app.use(cors());

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Now, any request made to your Express server will have CORS headers added to the response, allowing cross-origin communication.

Additional Information

• The cors() method without any arguments enables CORS for all origins and methods.
• You can specify specific origins, methods, or headers allowed for CORS by passing an options object to the cors() method.
• CORS headers added by Express to the response include Access-Control-Allow-Origin (set to the request origin), Access-Control-Allow-Methods (set to the request method), and Access-Control-Allow-Headers (set to the request headers).

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