feat: langchain improved

demos/use_cases/multi_frameworks/test.rest

@@ -0,0 +1,43 @@
+@llm_endpoint = http://localhost:12000
+
+### Travel Agent Chat Completion Request
+POST {{llm_endpoint}}/v1/chat/completions HTTP/1.1
+Content-Type: application/json
+
+{
+  "model": "gpt-4o",
+  "messages": [
+    {
+      "role": "user",
+      "content": "What's the weather in Seattle?"
+    },
+    {
+      "role": "assistant",
+      "content": "The weather in Seattle is sunny with a temperature of 60 degrees Fahrenheit."
+    },
+    {
+      "role": "user",
+      "content": "What is one Alaska flight that goes direct to Atlanta from Seattle?"
+    }
+  ],
+  "max_tokens": 1000,
+  "stream": false,
+  "temperature": 1.0
+}
+
+
+### test 8001
+
+### test upstream llm
+POST http://localhost:8001/v1/chat/completions HTTP/1.1
+Content-Type: application/json
+
+{
+   "messages": [
+      {
+         "role": "system",
+         "content": "\nCurrent weather data for Seattle:\n\n{\n  \"location\": \"Seattle\",\n  \"forecast\": [\n    {\n      \"date\": \"2025-12-22\",\n      \"day_name\": \"Monday\",\n      \"temperature_c\": 8.3,\n      \"temperature_f\": 46.9,\n      \"temperature_max_c\": 8.3,\n      \"temperature_min_c\": 2.8,\n      \"condition\": \"Rainy\",\n      \"sunrise\": \"07:55\",\n      \"sunset\": \"16:20\"\n    }\n  ]\n}\n\nUse this data to answer the user's weather query."
+      }
+   ],
+   "model": "gpt-4o",
+}