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Report SSE 401 errors to the client

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This commit is contained in:
Justin Spahr-Summers 2025-01-24 11:04:44 +00:00
commit 8bb5308797
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1 changed files with 24 additions and 1 deletions
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14
server/src/index.ts
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@ -12,6 +12,7 @@ import {
import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
import express from "express";
import { findActualExecutable } from "spawn-rx";
import { isSseError } from "./errors.js";
import mcpProxy from "./mcpProxy.js";
const SSE_HEADERS_PASSTHROUGH = ['Authorization'];
@ -98,7 +99,18 @@ app.get("/sse", async (req, res) => {
try {
console.log("New SSE connection");
const backingServerTransport = await createTransport(req);
let backingServerTransport;
try {
backingServerTransport = await createTransport(req);
} catch (error) {
if (isSseError(error) && error.code === 401) {
console.error("Received 401 Unauthorized from MCP server:", error.message);
res.status(401).json(error);
return;
}
throw error;
}
console.log("Connected MCP client to backing server transport");