diff --git a/docs/Usage.md b/docs/Usage.md
index 18a04e5..bc3a79d 100644
--- a/docs/Usage.md
+++ b/docs/Usage.md
@@ -94,7 +94,6 @@ print(doc_result[0][:5])
 **Important Notice**: Please carefully review the following points before using this proxy API for Multimodal.
 
 1. This API is only supported by Claude 3 model.
-2. You should ensure the image url can be publicly accessible in the Lambda/Fargate.
 
 **Example Request**
 
@@ -124,6 +123,35 @@ curl $OPENAI_BASE_URL/chat/completions \
 }'
 ```
 
+If you need to use this API with non-public images, you can do base64 the image first and pass the encoded string. 
+Replace `image/jpeg` with the actual content type. Currently, Only 'image/jpeg', 'image/png', 'image/gif' or 'image/webp' is supported.
+
+```bash
+curl $OPENAI_BASE_URL/chat/completions \
+  -H "Content-Type: application/json" \
+  -H "Authorization: Bearer $OPENAI_API_KEY" \
+  -d '{
+    "model": "gpt-3.5-turbo",
+    "messages": [
+        {
+            "role": "user",
+            "content": [
+                {
+                    "type": "text",
+                    "text": "please identify and count all the objects in this images, list all the names"
+                },
+                {
+                    "type": "image_url",
+                    "image_url": {
+                        "url": "data:image/jpeg;base64,<your image data>"
+                    }
+                }
+            ]
+        }
+    ]
+}'
+```
+
 **Example Response**
 
 ```json
diff --git a/docs/Usage_CN.md b/docs/Usage_CN.md
index 27d1a30..00279d8 100644
--- a/docs/Usage_CN.md
+++ b/docs/Usage_CN.md
@@ -93,7 +93,6 @@ print(doc_result[0][:5])
 **重要**:在使用此代理API进行多模态处理之前,请仔细阅读以下几点:
 
 1. 此API 仅支持Claude 3模型。
-2. 您应确保 Lambda/Fargate 可以公开访问该图片URL。
 
 **Request 示例**
 
@@ -123,6 +122,35 @@ curl $OPENAI_BASE_URL/chat/completions \
 }'
 ```
 
+如果您需要使用此API处理非公开图像,您可以先对图像进行base64编码,然后传递编码后的字符串。
+将"image/jpeg"替换为实际的内容类型(content type)。目前仅支持"image/jpeg"、"image/png"、"image/gif"或"image/webp"。
+
+```bash
+curl $OPENAI_BASE_URL/chat/completions \
+  -H "Content-Type: application/json" \
+  -H "Authorization: Bearer $OPENAI_API_KEY" \
+  -d '{
+    "model": "gpt-3.5-turbo",
+    "messages": [
+        {
+            "role": "user",
+            "content": [
+                {
+                    "type": "text",
+                    "text": "please identify and count all the objects in this images, list all the names"
+                },
+                {
+                    "type": "image_url",
+                    "image_url": {
+                        "url": "data:image/jpeg;base64,<your image data>"
+                    }
+                }
+            ]
+        }
+    ]
+}'
+```
+
 **Response 示例**
 
 ```json
diff --git a/src/api/models/bedrock.py b/src/api/models/bedrock.py
index ddb0d01..5ada2cf 100644
--- a/src/api/models/bedrock.py
+++ b/src/api/models/bedrock.py
@@ -1,6 +1,7 @@
 import base64
 import json
 import logging
+import re
 from abc import ABC
 from typing import AsyncIterable, Iterable
 
@@ -175,16 +176,32 @@ class ClaudeModel(BedrockModel):
             )
         ]
 
-    def _get_base64_image(self, image_url: str) -> str:
+    def _get_base64_image(self, image_url: str) -> tuple[str, str]:
+        """Try to get the base64 data from an image url.
+
+        returns a tuple of (Image Data, Content Type)
+        """
+        pattern = r"^data:(image/[a-z]*);base64,\s*"
+        content_type = re.search(pattern, image_url)
+        # if already base64 encoded.
+        # Only supports 'image/jpeg', 'image/png', 'image/gif' or 'image/webp'
+        if content_type:
+            image_data = re.sub(pattern, "", image_url)
+            return image_data, content_type.group(1)
+
         # Send a request to the image URL
         response = requests.get(image_url)
+        content_type = response.headers.get('Content-Type')
+        if not content_type.startswith("image"):
+            content_type = "image/jpeg"
+
         # Check if the request was successful
         if response.status_code == 200:
             # Get the image content
             image_content = response.content
             # Encode the image content as base64
             base64_image = base64.b64encode(image_content)
-            return base64_image.decode("utf-8")
+            return base64_image.decode("utf-8"), content_type
         else:
             raise HTTPException(
                 status_code=500, detail="Unable to access the image url"
@@ -199,13 +216,14 @@ class ClaudeModel(BedrockModel):
             if isinstance(part, TextContent):
                 content_parts.append(part.model_dump())
             else:
+                image_data, content_type = self._get_base64_image(part.image_url.url)
                 content_parts.append(
                     {
                         "type": "image",
                         "source": {
                             "type": "base64",
-                            "media_type": "image/jpeg",
-                            "data": self._get_base64_image(part.image_url.url),
+                            "media_type": content_type,
+                            "data": image_data,
                         },
                     }
                 )