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Download API resume

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

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Accepted answers

Greg-DB

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!

All comments

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

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!