General URL for many files from 1 shared folder

duckladydinh I'm not sure I understand your comment. If something isn't working as documented, please share the details so we can look into it for you.

For example, you can use the /2/files/list_folder endpoint to list the contents of a folder from a shared link for the folder:

curl -X POST https://api.dropboxapi.com/2/files/list_folder \
    --header "Authorization: Bearer <ACCESS_TOKEN>" \
    --header "Content-Type: application/json" \
    --data "{\"path\": \"\",\"shared_link\": {\"url\": \"<SHARED_LINK_FOR_FOLDER>\"}}"

# {
#   "entries": [
#     {
#       ".tag": "folder",
#       "name": "Test",
#       "path_lower": "/test shared folder/test",
#       "path_display": "/test shared folder/Test",
#       "parent_shared_folder_id": "248930168",
#       "id": "id:uKXaztDfaPQAAAAAAAAABA",
#       "sharing_info": {
#         "read_only": false,
#         "parent_shared_folder_id": "248930168",
#         "traverse_only": false,
#         "no_access": false
#       }
#     },
# <redacted for brevity>
#   ],
#   "cursor": "<redacted for brevity>",
#   "has_more": false
# }

And you can also list sub-folders like that using the "path" parameter:

curl -X POST https://api.dropboxapi.com/2/files/list_folder \
    --header "Authorization: Bearer <ACCESS_TOKEN>" \
    --header "Content-Type: application/json" \
    --data "{\"path\": \"/test\",\"shared_link\": {\"url\": \"<SHARED_LINK_FOR_FOLDER>\"}}"

# {
#   "entries": [
# <redacted for brevity>
#     {
#       ".tag": "file",
#       "name": "test.txt",
#       "path_lower": "/test shared folder/test/test.txt",
#       "path_display": "/test shared folder/Test/test.txt",
#       "parent_shared_folder_id": "248930168",
#       "id": "id:uKXaztDfaPQAAAAAAAAB3w",
#       "client_modified": "2018-05-10T17:07:46Z",
#       "server_modified": "2019-10-18T20:35:37Z",
#       "rev": "5953546d8c26e0ed65f78",
#       "size": 4,
#       "sharing_info": {
#         "read_only": false,
#         "parent_shared_folder_id": "248930168",
#         "modified_by": "<redacted for brevity>"
#       },
#       "is_downloadable": true,
#       "content_hash": "954d5a49fd70d9b8bcdb35d252267829957f7ef7fa6c74f88419bdc5e82209f4"
#     }
#   ],
#   "cursor": "<redacted for brevity>",
#   "has_more": false
# }

And then you can download a listed file using /2/sharing/get_shared_link_file by likewise using the relative path:

curl -X POST https://content.dropboxapi.com/2/sharing/get_shared_link_file \
    --header "Authorization: Bearer <ACCESS_TOKEN>" \
    --header "Dropbox-API-Arg: {\"url\": \"<SHARED_LINK_FOR_FOLDER>\",\"path\": \"/test.txt\"}"

# test file contents

Hi, thank you Grek. K for your very helpful comment. I did not look at the 'get_shared_link_file' and yes, it can fix my current problem. I am sorry for jumping to an early conclusion reconfirmed that the solution works.

Just a little question: Is there any way to do the same for 'folder'?

duckladydinh No, unfortunately there currently isn't a way to download a whole sub-folder from a a shared link for a folder via the API, but I'll pass this along as a feature request. I can't promise if or when that might be implemented though. 

Note that you can download the top-level folder as a zip from the shared link as documented here, but that doesn't provide a mechanism for downloading a specific sub-folder.

Update: The Dropbox API now returns the shared link for the nested item as 'url' when requesting the metadata for that item using the "path" parameter on /2/sharing/get_shared_link_metadata (instead of the original parent link). You could use that to download a specific sub-folder.