DropBox: HTTP Error 401 Unauthorized response

VCL TMS VCL Cloud Pack
1

Hi,

When testing download file from DropBox:
 Storage->Download( remotefile, localfile);

Most of time, it works Ok, but sometimes the file received only contains : {"error": "Unauthorized"}

Should the storage component capture this error?

Regards,
Robbert

2

Is this immediately when the download starts or after the download is busy?

Is this when you restart the app with an access token that was loaded or when a new authentication/authorization has happened?
When you use a persisted token, can you try to always call first RefreshToken before starting the download?
3

Thanks for the reply, here is the detail:

1. Application starts, and then do the followings:  (No problems here )
AdvDropBox1->App->Key =iDropBoxAppkey;
AdvDropBox1->App->Secret=iDropBoxAppSecret;
Storage =AdvDropBox1;
if ( Storage->App->Key !="") {
Storage->LoadTokens();
acc = Storage->TestTokens();
if ( !acc) {
acc = Storage->RefreshAccess();
}
if ( !acc) {

Storage->DoAuth();
}else{
Screen->Cursor = crHourGlass;
Screen->Cursor = crDefault;
DoConnect();
}
}else {
ShowMessage("Please provide a valid application ID");
}
2. When Time out, get file list from dropbox using 
AdvDropBox1->GetFolderInfo(folder,  AdvDropBox1->DDrive );
or 
TDropBoxItems *myitems = AdvDropBox1->Search(folder,".jpg") ;
3. For each file do:
Storage->Download(remotefile, localfile );
4. Sleep some times and go to step 2

     Most of time, files will be downloaded successfully except: 
    Let's take yesterday as example around 20000 small files ( file size between 5~15K ) have been downloaded.
   1) "Can not open URL... " exception happened twice. I don't know which party: dropbox or your component caused this error.
   2)"Invalid typecast"  exception happened 8 times.  Don't know how this happened yet.
   3) 98 files contain  {"error": "Unauthorized"}, 
  ( There is another application creates and uploads files to drops continuously.)

   For the moment, my workaround is: check the file size once download finished, if the file size is less 100 bytes, try to download the file again. 
   If it will be good if  "Storage->Download( remotefile, localfile);" could report this error.

Thanks for your help.

    
4

Can you do a storage->RefreshAccess() before starting a new download to see if this helps?

5

Thanks Bruno,

I have tried to use storage->RefreshAccess() but it always return false and furthermore for the 3 test files to be downloaded, the 3rd download always return "Can not Open URL".

And if I remove storage->RefreshAccess(), all the three files can be downloaded without any problem.



6

Further information:

 "Can not open URL... "  could happen for search,download and delete operations.
7

Can this be reproduced with our demo app or do you have some sample source project with which we can reproduce this as so far, we haven't seen this problem.

8

Hi Bruno,


I've tried many times but failed to send the mails with attachments.
error msg:

Delivery to the following recipient failed permanently:

      info@tmssoftware.com

 Technical details of permanent failure:

Google tried to deliver your message, but it was rejected by the server for the recipient domain tmssoftware.com by pop.tmssoftware.com. [205.178.132.80].

 The error that the other server returned was:

503 you must authenticate first (#5.5.1)

......


9

Hi Bruno,


You can find the attachments here:
https://drive.google.com/file/d/0B1pOJKOyUXmzUFZCTHpIbnVxb0k/edit?usp=sharing
https://drive.google.com/file/d/0B1pOJKOyUXmzVlNEMkZVeE1JOGs/edit?usp=sharing

You can see from the log that we need to wait about 3 hours to have this errors.