为何item响应缺失webDavUrl？GET列表子项接口无该属性原因

Hey there! I’ve run into this exact issue before, so let’s break down the most common reasons you’re not seeing the webDavUrl field in your API response:

• You didn’t explicitly request the field with $select
  By default, Microsoft Graph API only returns a slim subset of an item’s properties to keep responses fast and lightweight. webDavUrl isn’t included in this default set—you need to explicitly ask for it using the $select query parameter.
  Example request to include the field:

  GET /groups/{group-id}/drive/items/{item-id}/children?$select=id,name,webDavUrl
  

• You’re using an outdated Graph API version
  Older versions of the Microsoft Graph API might not support returning webDavUrl for group drive items. Make sure you’re using at least the v1.0 endpoint (the stable production version) or the beta endpoint if you need access to newer features. Avoid deprecated legacy API versions entirely.

• The item doesn’t support WebDAV access
  While most files and folders in SharePoint/Group drives work with WebDAV, there are edge cases where it’s unavailable—like external items linked from other services, system-generated restricted files, or items with special permissions that block WebDAV access. In these cases, webDavUrl simply won’t exist for the item, even if you request it.

Give these checks a try, and you’ll either get the webDavUrl field showing up or understand why it’s not available for the items you’re querying.

内容的提问来源于stack exchange，提问作者Tao