diff --git a/chat2db-server/chat2db-server-web/chat2db-server-web-api/src/main/java/ai/chat2db/server/web/api/controller/ai/fastchat/listener/FastChatAIEventSourceListener.java b/chat2db-server/chat2db-server-web/chat2db-server-web-api/src/main/java/ai/chat2db/server/web/api/controller/ai/fastchat/listener/FastChatAIEventSourceListener.java
index 7ad62178..70defa3c 100644
--- a/chat2db-server/chat2db-server-web/chat2db-server-web-api/src/main/java/ai/chat2db/server/web/api/controller/ai/fastchat/listener/FastChatAIEventSourceListener.java
+++ b/chat2db-server/chat2db-server-web/chat2db-server-web-api/src/main/java/ai/chat2db/server/web/api/controller/ai/fastchat/listener/FastChatAIEventSourceListener.java
@@ -66,7 +66,7 @@ public class FastChatAIEventSourceListener extends EventSourceListener {
         log.info("Model={} is created at {}.", chatCompletions.getId(),
             chatCompletions.getCreated());
         for (FastChatChoice choice : chatCompletions.getChoices()) {
-            FastChatMessage message = choice.getMessage();
+            FastChatMessage message = choice.getDelta();
             if (message != null) {
                 log.info("Index: {}, Chat Role: {}", choice.getIndex(), message.getRole());
                 if (message.getContent() != null) {
diff --git a/chat2db-server/chat2db-server-web/chat2db-server-web-api/src/main/java/ai/chat2db/server/web/api/controller/ai/fastchat/model/FastChatChoice.java b/chat2db-server/chat2db-server-web/chat2db-server-web-api/src/main/java/ai/chat2db/server/web/api/controller/ai/fastchat/model/FastChatChoice.java
index 5ac0c364..751f777b 100644
--- a/chat2db-server/chat2db-server-web/chat2db-server-web-api/src/main/java/ai/chat2db/server/web/api/controller/ai/fastchat/model/FastChatChoice.java
+++ b/chat2db-server/chat2db-server-web/chat2db-server-web-api/src/main/java/ai/chat2db/server/web/api/controller/ai/fastchat/model/FastChatChoice.java
@@ -30,8 +30,8 @@ public final class FastChatChoice {
     /*
      * The log probabilities model for tokens associated with this completions choice.
      */
-    @JsonProperty(value = "message")
-    private FastChatMessage message;
+    @JsonProperty(value = "delta")
+    private FastChatMessage delta;
 
     /*
      * Reason for finishing
@@ -44,18 +44,18 @@ public final class FastChatChoice {
      *
      * @param text the text value to set.
      * @param index the index value to set.
-     * @param message the message value to set
+     * @param delta the message value to set
      * @param finishReason the finishReason value to set.
      */
     @JsonCreator
     private FastChatChoice(
             @JsonProperty(value = "text") String text,
             @JsonProperty(value = "index") int index,
-            @JsonProperty(value = "message") FastChatMessage message,
+            @JsonProperty(value = "delta") FastChatMessage delta,
             @JsonProperty(value = "finish_reason") FastChatCompletionsFinishReason finishReason) {
         this.text = text;
         this.index = index;
-        this.message = message;
+        this.delta = delta;
         this.finishReason = finishReason;
     }
 
@@ -82,8 +82,8 @@ public final class FastChatChoice {
      *
      * @return the logprobs value.
      */
-    public FastChatMessage getMessage() {
-        return this.message;
+    public FastChatMessage getDelta() {
+        return this.delta;
     }
 
     /**
diff --git a/chat2db-server/chat2db-server-web/chat2db-server-web-api/src/main/java/ai/chat2db/server/web/api/controller/config/ConfigController.java b/chat2db-server/chat2db-server-web/chat2db-server-web-api/src/main/java/ai/chat2db/server/web/api/controller/config/ConfigController.java
index fd07c3ec..d3698b61 100644
--- a/chat2db-server/chat2db-server-web/chat2db-server-web-api/src/main/java/ai/chat2db/server/web/api/controller/config/ConfigController.java
+++ b/chat2db-server/chat2db-server-web/chat2db-server-web-api/src/main/java/ai/chat2db/server/web/api/controller/config/ConfigController.java
@@ -83,7 +83,7 @@ public class ConfigController {
                 saveChat2dbAIConfig(request);
                 break;
             case RESTAI:
-                saveRestAIConfig(request);
+                saveFastChatAIConfig(request);
                 break;
             case AZUREAI:
                 saveAzureAIConfig(request);
@@ -330,12 +330,6 @@ public class ConfigController {
                 config.setModel(Objects.nonNull(azureDeployId.getData()) ? azureDeployId.getData().getContent() : "");
                 break;
             case RESTAI:
-                DataResult<Config> restAiUrl = configService.find(RestAIClient.REST_AI_URL);
-                DataResult<Config> restAiHttpMethod = configService.find(RestAIClient.REST_AI_STREAM_OUT);
-                config.setApiHost(Objects.nonNull(restAiUrl.getData()) ? restAiUrl.getData().getContent() : "");
-                config.setStream(Objects.nonNull(restAiHttpMethod.getData()) ? Boolean.valueOf(
-                    restAiHttpMethod.getData().getContent()) : Boolean.TRUE);
-                break;
             case FASTCHATAI:
                 DataResult<Config> fastChatApiKey = configService.find(FastChatAIClient.FASTCHAT_API_KEY);
                 DataResult<Config> fastChatApiHost = configService.find(FastChatAIClient.FASTCHAT_HOST);