fix: catch gateway error gracefully

Author: VisargD

src/handlers/handlerUtils.ts

@@ -790,7 +790,12 @@ export async function tryTargetsRecursively(
         // tryPost always returns a Response.
         // TypeError will check for all unhandled exceptions.
         // GatewayError will check for all handled exceptions which cannot allow the request to proceed.
-        if (error instanceof TypeError || error instanceof GatewayError) {
+        if (
+          error instanceof TypeError ||
+          error instanceof GatewayError ||
+          !error.response ||
+          (error.response && !(error.response instanceof Response))
+        ) {
           console.error(
             'tryTargetsRecursively error: ',
             error.message,

src/handlers/services/providerContext.ts

@@ -8,11 +8,12 @@ import {
 import Providers from '../../providers';
 import { RequestContext } from './requestContext';
 import { ANTHROPIC, AZURE_OPEN_AI } from '../../globals';
+import { GatewayError } from '../../errors/GatewayError';
 
 export class ProviderContext {
   constructor(private provider: string) {
     if (!Providers[provider]) {
-      throw new Error(`Provider ${provider} not found`);
+      throw new GatewayError(`Provider ${provider} not found`);
     }
   }