Add skip-auth-preflight flag to allow OPTIONS requests through proxy (#7284)

src/node/main.ts

@@ -163,6 +163,9 @@ export const runCodeServer = async (
     logger.info(`  - ${plural(args["proxy-domain"].length, "Proxying the following domain")}:`)
     args["proxy-domain"].forEach((domain) => logger.info(`    - ${domain}`))
   }
+  if (args["skip-auth-preflight"]) {
+    logger.info("  - Skipping authentication for preflight requests")
+  }
   if (process.env.VSCODE_PROXY_URI) {
     logger.info(`Using proxy URI in PORTS tab: ${process.env.VSCODE_PROXY_URI}`)
   }