docs(raw_request_response.md): show how to get openai headers from response

docs/my-website/docs/observability/raw_request_response.md

@@ -1,10 +1,16 @@
 import Image from '@theme/IdealImage';
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
 
 # Raw Request/Response Logging
 
+
+## Logging
 See the raw request/response sent by LiteLLM in your logging provider (OTEL/Langfuse/etc.).
 
-**on SDK**
+<Tabs>
+<TabItem value="sdk" label="SDK">
+
 ```python
 # pip install langfuse 
 import litellm
@@ -34,13 +40,85 @@ response = litellm.completion(
 )
 ```
 
-**on Proxy**
+
+</TabItem>
+<TabItem value="proxy" label="PROXY">
+
 
 ```yaml
 litellm_settings:
   log_raw_request_response: True
 ```
 
+
+</TabItem>
+</Tabs>
+
 **Expected Log**
 
-<Image img={require('../../img/raw_request_log.png')}/>
+<Image img={require('../../img/raw_request_log.png')}/>
+
+
+## Return Raw Response Headers 
+
+Return raw response headers from llm provider. 
+
+Currently only supported for openai. 
+
+<Tabs>
+<TabItem value="sdk" label="SDK">
+
+```python
+import litellm
+import os
+
+litellm.return_response_headers = True
+
+## set ENV variables
+os.environ["OPENAI_API_KEY"] = "your-api-key"
+
+response = litellm.completion(
+  model="gpt-3.5-turbo",
+  messages=[{ "content": "Hello, how are you?","role": "user"}]
+)
+
+print(response._hidden_params)
+```
+
+</TabItem>
+<TabItem value="proxy" label="PROXY">
+
+1. Setup config.yaml
+
+```yaml
+model_list:
+  - model_name: gpt-3.5-turbo
+    litellm_params:
+      model: gpt-3.5-turbo
+      api_key: os.environ/GROQ_API_KEY
+
+litellm_settings:
+  return_response_headers: true
+```
+
+2. Test it!
+
+```bash
+curl -X POST 'http://0.0.0.0:4000/chat/completions' \
+-H 'Content-Type: application/json' \
+-H 'Authorization: Bearer sk-1234' \
+-D '{
+    "model": "gpt-3.5-turbo",
+    "messages": [
+        { "role": "system", "content": "Use your tools smartly"},
+        { "role": "user", "content": "What time is it now? Use your tool"}
+    ]
+}'
+```
+</TabItem>
+</Tabs>
+
+
+**Expected Response**
+
+<Image img={require('../../img/raw_response_headers.png')}/>