Download API resume

[Alice07]

Hello,

I daily need to download a file into iOS from Dropbox using API.

The file is ~1GB. 

Whether the screen saver occurs, or under some other conditions (incoming calls), then the download is aborted, I can restart it, but not resume it from where it left. 

It is quite frustrating since it happens frequently.

Is there a way to resume a partial download or force dividing download into smaller parts ?

Thanks

[Greg-DB]

Are you using one of the official Dropbox SDKs? If so, which one? 

The API itself does support "Range Retrieval Requests", e.g., on /2/files/download, but not all of the SDKs implement that.

[Alice07]

Hello,

thanks for your answer.

I actually using the /2/files/download API

I do not know how to add/implement "Range Retrieval Requests".

Can you provide some examples or suggestions ?

[Greg-DB · Accepted solution]

Sure, you can use this by setting the "Range" header. You can find information on the syntax in the spec. For example, here's a call that would download only bytes 0 through 5:

curl -X POST https://content.dropboxapi.com/2/files/download \
    --header "Authorization: Bearer <ACCESS_TOKEN>" \
    --header "Dropbox-API-Arg: {\"path\": \"/test.txt\"}" \
    --header "Range: bytes=0-5"

And here's an example that would download everything from byte index 6 to the end:

curl -X POST https://content.dropboxapi.com/2/files/download \
    --header "Authorization: Bearer <ACCESS_TOKEN>" \
    --header "Dropbox-API-Arg: {\"path\": \"/test.txt\"}" \
    --header "Range: bytes=6-"

Hope this helps!