Azure Logic Apps调用Form Recognizer发送PDF失败的问题排查

问题场景 #

我在Azure Logic App中使用了Analyze Document for Prebuilt or Custom models (v3.0 API)动作，自定义模型本身运行正常，也能通过Postman正常调用。但当尝试从SharePoint获取PDF文件并发送至Form Recognizer服务时，收到以下错误：

{
  "error": {
    "code": "InvalidRequest",
    "message": "Invalid request.",
    "innererror": {
      "code": "InvalidContent",
      "message": "The file is corrupted or format is unsupported. Refer to documentation for the list of supported formats."
    }
  }
}

已尝试的方案 #

• 直接将Get file content传入Document/Image File Content输入框
• 传入表达式body('Get_file_content')['$content']
• 传入表达式concat('data:application/pdf;base64,',body('Get_file_content')['$content'])
  • 确认该Base64内容可正常转换为PDF，内容有效
• 传入表达式base64ToBinary(body('Get_file_content')['$content'])
  • 仍然报错失败

解决方法 #

感谢@vijaya的帮助，发现Document/Image URL参数并非必填项，将该参数留空后，直接使用原始的Get File Content传入Document/Image File Content即可成功调用服务！

内容的提问来源于stack exchange，提问作者ericOnline