Nano-banana 官方格式

curl --location -g --request POST '{{base_url}}v1beta/models/gemini-2.5-flash-image:generateContent' \
--header 'Authorization: 默认值:Bearer {{YOUR_API_KEY}}' \
--header 'Content-Type: 示例值: application/json' \
--data-raw '{
    "contents": [
        {
            "parts": [
                {
                    "inlineData": {
                        "data": "iVBORw0KGgoAAAANSUh.....",
                        "mimeType": "image/png"
                    }
                },
                {
                    "inlineData": {
                        "data": "iVBORw0KGgoAAAANSUh.....",
                        "mimeType": "image/png"
                    }
                },
                {
                    "text": "hi"
                }
            ],
            "role": "user"
        }
    ],
    "generationConfig": {
        "imageConfig": {
            "aspectRatio": "3:4"
        },
        "responseModalities": [
            "IMAGE"
        ]
    }
}'