🛠️ fix: Completion Edge Cases & Improve Error Handling UX (#3968)

* fix: edge cases concerning completion response as an array

* refactor: improve invalid request error UX

api/app/clients/BaseClient.js

@@ -3,6 +3,7 @@ const fetch = require('node-fetch');
 const {
   supportsBalanceCheck,
   isAgentsEndpoint,
+  paramEndpoints,
   ErrorTypes,
   Constants,
   CacheKeys,
@@ -561,6 +562,7 @@ class BaseClient {
       });
     }
 
+    /** @type {string|string[]|undefined} */
     const completion = await this.sendCompletion(payload, opts);
     this.abortController.requestCompleted = true;
 
@@ -580,9 +582,11 @@ class BaseClient {
 
     if (typeof completion === 'string') {
       responseMessage.text = addSpaceIfNeeded(generation) + completion;
-    } else if (completion) {
+    } else if (Array.isArray(completion) && paramEndpoints.has(this.options.endpoint)) {
       responseMessage.text = '';
       responseMessage.content = completion;
+    } else if (Array.isArray(completion)) {
+      responseMessage.text = addSpaceIfNeeded(generation) + completion.join('');
     }
 
     if (

api/app/clients/OpenAIClient.js

@@ -1271,7 +1271,7 @@ ${convo}
       const { choices } = chatCompletion;
       if (!Array.isArray(choices) || choices.length === 0) {
         logger.warn('[OpenAIClient] Chat completion response has no choices');
-        return intermediateReply;
+        return intermediateReply.join('');
       }
 
       const { message, finish_reason } = choices[0] ?? {};
@@ -1281,7 +1281,7 @@ ${convo}
 
       if (!message) {
         logger.warn('[OpenAIClient] Message is undefined in chatCompletion response');
-        return intermediateReply;
+        return intermediateReply.join('');
       }
 
       if (typeof message.content !== 'string' || message.content.trim() === '') {
@@ -1316,7 +1316,7 @@ ${convo}
         logger.error('[OpenAIClient] Known OpenAI error:', err);
         return intermediateReply.join('');
       } else if (err instanceof OpenAI.APIError) {
-        if (intermediateReply) {
+        if (intermediateReply.length > 0) {
           return intermediateReply.join('');
         } else {
           throw err;

api/server/middleware/abortMiddleware.js

@@ -1,4 +1,4 @@
-const { isAssistantsEndpoint } = require('librechat-data-provider');
+const { isAssistantsEndpoint, ErrorTypes } = require('librechat-data-provider');
 const { sendMessage, sendError, countTokens, isEnabled } = require('~/server/utils');
 const { truncateText, smartTruncateText } = require('~/app/clients/prompts');
 const clearPendingReq = require('~/cache/clearPendingReq');
@@ -165,10 +165,14 @@ const handleAbortError = async (res, req, error, data) => {
     );
   }
 
-  const errorText = error?.message?.includes('"type"')
+  let errorText = error?.message?.includes('"type"')
     ? error.message
     : 'An error occurred while processing your request. Please contact the Admin.';
 
+  if (error?.type === ErrorTypes.INVALID_REQUEST) {
+    errorText = `{"type":"${ErrorTypes.INVALID_REQUEST}"}`;
+  }
+
   const respondWithError = async (partialText) => {
     let options = {
       sender,

client/src/components/Messages/Content/Error.tsx

@@ -42,6 +42,7 @@ const errorMessages = {
   [ErrorTypes.NO_USER_KEY]: 'com_error_no_user_key',
   [ErrorTypes.INVALID_USER_KEY]: 'com_error_invalid_user_key',
   [ErrorTypes.NO_BASE_URL]: 'com_error_no_base_url',
+  [ErrorTypes.INVALID_REQUEST]: 'com_error_invalid_request',
   [ErrorTypes.EXPIRED_USER_KEY]: (json: TExpiredKey, localize: LocalizeFunction) => {
     const { expiredAt, endpoint } = json;
     return localize('com_error_expired_user_key', endpoint, expiredAt);

client/src/localization/languages/Eng.ts

@@ -22,6 +22,8 @@ export default {
     'It appears that the content submitted has been flagged by our moderation system for not aligning with our community guidelines. We\'re unable to proceed with this specific topic. If you have any other questions or topics you\'d like to explore, please edit your message, or create a new conversation.',
   com_error_no_user_key: 'No key found. Please provide a key and try again.',
   com_error_no_base_url: 'No base URL found. Please provide one and try again.',
+  com_error_invalid_request:
+    'The AI service rejected the request due to an error. This could be caused by an invalid API key or an improperly formatted request.',
   com_error_invalid_user_key: 'Invalid key provided. Please provide a valid key and try again.',
   com_error_expired_user_key:
     'Provided key for {0} expired at {1}. Please provide a new key and try again.',

packages/data-provider/src/config.ts

@@ -943,11 +943,14 @@ export enum ErrorTypes {
    * Moderation error
    */
   MODERATION = 'moderation',
-
   /**
    * Prompt exceeds max length
    */
   INPUT_LENGTH = 'INPUT_LENGTH',
+  /**
+   * Invalid request error, API rejected request
+   */
+  INVALID_REQUEST = 'invalid_request_error',
 }
 
 /**