make auth token configurable via env var

Author: kentcdodds

server/src/index.ts

@@ -89,7 +89,7 @@ app.use((req, res, next) => {
 const webAppTransports: Map<string, Transport> = new Map<string, Transport>(); // Web app transports by web app sessionId
 const serverTransports: Map<string, Transport> = new Map<string, Transport>(); // Server Transports by web app sessionId
 
-const sessionToken = randomBytes(32).toString("hex");
+const sessionToken = process.env.MCP_PROXY_AUTH_TOKEN || randomBytes(32).toString("hex");
 const authDisabled = !!process.env.DANGEROUSLY_OMIT_AUTH;
 
 // Origin validation middleware to prevent DNS rebinding attacks