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Open CORS for any origin to allow direct browser connection (#2725)

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* * In src/everything/sse.ts
  - import cors
  - use cors with config allowing any origin + GET/POST
* In src/everything/streamableHttp.ts
  - import cors
    - use cors with config allowing any origin + GET/POST/DELETE, and exposed protocol headers for client to read
* In package.json and package-lock.json
  - add cors as a dependency

* * In package.json and package-lock.json
  - add @types/cors as dev dependency

* Add caution note for CORS origin wildcard usage

Added caution note for using '*' in CORS origin.

* * In streamableHttp.ts
  - remove remove unintentional console log

* * In streamableHttp.ts
  - add comment about why opening cors for all routes

* * In sse.ts
  - add comment about using * with caution in production for cors

* * In sse.ts
  - indent on cors config

---------

Co-authored-by: shaun smith <1936278+evalstate@users.noreply.github.com>
This commit is contained in:
Cliff Hall
2025-09-18 20:28:41 -04:00
committed by GitHub
parent 9280e8fa74
commit f8c05004d0
4 changed files with 34 additions and 1 deletions
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8
src/everything/sse.ts
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@@ -1,11 +1,17 @@
import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
import express from "express";
import { createServer } from "./everything.js";
import cors from 'cors';
console.error('Starting SSE server...');
const app = express();
app.use(cors({
"origin": "*", // use "*" with caution in production
"methods": "GET,POST",
"preflightContinue": false,
"optionsSuccessStatus": 204,
})); // Enable CORS for all routes so Inspector can connect
const transports: Map<string, SSEServerTransport> = new Map<string, SSEServerTransport>();
app.get("/sse", async (req, res) => {