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De L.1's avatar
De L.1
Collaborator | Level 9
2 years ago

Downloading part of a file via /get_temporary_link with Range header returns incorrect content-type

When downloading a specific part of a file using the link received via a /get_temporary_link call and the HTTP header Range: bytes=..., the content-type application/grpc is sent instead of the actual content-type of the file.

 

Request Headers:

 

GET https://uc383828c22b...3d5ecbc28.dl.dropboxusercontent.com/cd/0/get/B61A....17HuE3Lr3UI4EEpPY/file
range:bytes=0-

 


Expected Response Headers:

 

HTTP/1.1 206 Partial Content
---
accept-ranges:bytes
Content-Length:26397831
Content-Range:bytes 0-26397830/26397831
content-type:video/mp4

 

 

Actual Response Headers:

 

HTTP/1.1 206 Partial Content
---
accept-ranges:bytes
Content-Length:26397831
Content-Range:bytes 0-26397830/26397831
content-type:application/grpc

 

 

So in this example (actually downloading the full file, but with the Range header), the video file is downloaded with a content-type of application/grpc rather than video/mp4.

 

This causes problems when (for example) you want to display a video file in an HTML 5 player using the link received from the /get_temporary_link call.  The HTML 5 player buffers the video file and loads the data in chunks. However, due to the incorrect content type, the browser will not accept the data as video content and will not be able to play it.

I've just noticed this problem, and I didn't have any problems with it before. So I think this problem has been introduced recently?

API
  • Greg-DB's avatar
    Greg-DB
    2 years ago

    This should be fixed now. Please let us know if you're still seeing any issues.

  • ncw's avatar
    ncw
    Collaborator | Level 8
    2 years ago

    Rclone users have reported a similar problem when using anything with `Range:` requests.

     

    There is a long thread here https://forum.rclone.org/t/failed-to-open-source-not-an-encrypted-file-bad-magic-string/37790

     

    But my summary is that Range: requests are not working properly. They appear to produce files which have an extra bit of HTTP header in them such as this (from the link above)

     

    I noticed "application/octet-stream" inside my all files header.
    Because of that, my applications do not recigionize files as valid.

    0000000 000 000 002 000 042 012 236 200 010 012 030 141 160 160 154 151
         \0  \0 002  \0   "  \n 236 200  \b  \n 030   a   p   p   l   i
0000020 143 141 164 151 157 156 057 157 143 164 145 164 055 163 164 162
          c   a   t   i   o   n   /   o   c   t   e   t   -   s   t   r
0000040 145 141 155 022 200 200 010 120 162 157 157 146 040 157 146 040
          e   a   m 022 200 200  \b

     

    This looks like a Dropbox bug to me.

     

     
     
    • ncw's avatar
      ncw
      Collaborator | Level 8
      2 years ago

      Here is a failing request and response

       

      I managed to reproduce this with a small file file.txt contents shello and using

      rclone cat --offset 3 dropbox:file.txt -vv --dump bodies

      This made this request

      2023/04/25 11:20:46 DEBUG : HTTP REQUEST (req 0xc0009fec00)
2023/04/25 11:20:46 DEBUG : POST /2/files/download HTTP/1.1
Host: content.dropboxapi.com
User-Agent: rclone/v1.63.0-beta.6980.470db6bcd
Content-Length: 0
Authorization: XXXX
Content-Type: application/octet-stream
Dropbox-Api-Arg: {"path":"id:qqS0afUHwS0AAAAAAA6Nig"}
Range: bytes=3-6

      And this response which appears to have muddled up the body with the header

      2023/04/25 11:20:47 DEBUG : HTTP RESPONSE (req 0xc0009fec00)
2023/04/25 11:20:47 Unsolicited response received on idle HTTP channel starting with "\"\n \n\x18application/octet-stream\x12\x04llo\n"; err=<nil>
2023/04/25 11:20:47 DEBUG : HTTP/1.1 206 Partial Content
Content-Length: 4
Accept-Encoding: identity,gzip
Accept-Ranges: bytes
Content-Range: bytes 3-6/7
Content-Security-Policy: sandbox allow-forms allow-scripts
Content-Type: application/grpc
Date: Tue, 25 Apr 2023 10:20:46 GMT
Dropbox-Api-Result: {"name": "file.txt", "path_lower": "/file.txt", "path_display": "/file.txt", "id": "id:qqS0afUHwS0AAAAAAA6Nig", "client_modified": "2022-11-09T12:59:37Z", "server_modified": "2022-11-09T12:59:41Z", "rev": "5ed093ae1400f082af73a", "size": 7, "is_downloadable": true, "content_hash": "483068e5287bde73b67923dae8c200d461d80997108030841a082e628489993b"}
Etag: W/"5ed093ae1400f082af73a"
Original-Content-Length: 4
Server: envoy
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
X-Dropbox-Request-Id: e186d6db20684aee82e1123611632a3a
X-Dropbox-Response-Origin: far_remote
X-Robots-Tag: noindex, nofollow, noimageindex
       
       
      • Greg-DB's avatar
        Greg-DB
        Icon for Dropbox Staff rankDropbox Staff
        2 years ago

        Thanks for the report! We're looking into it. I'll follow up here once I have an update on this.

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