how download file with oauth2

Daniele F.1

Hi all, I'm switching my Dropbox app from oauth1 to oauth2. I've an issue when I try to download a file.

I use this code:

var r = Call("https://content.dropboxapi.com/2/files/download", access_token, "{\"path\":\"" + metaPath + "\"}");

 

private string Call(string endpoint, string access_token, string json) {
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(endpoint);
request.ContentType = "application/json";
request.Headers.Add("Authorization", "Bearer " + access_token);
request.Method = "POST";
Stream requestStream = request.GetRequestStream();
requestStream.Write(Encoding.UTF8.GetBytes(json), 0, json.Length);
requestStream.Close();
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string txtResponse = reader.ReadToEnd();
return txtResponse;
}

 

The "Call" function works well whit *list_folder* endpoint. But I get a 400 http error (invalid request) with *download* endopint. Any tips? It's the right way?

Thanks!

Steve M.

Sorry for the confusion here... we're still missing some overview documentation that may have made this clearer.

For "content-style" endpoints like upload and download, the JSON is passed in the "Dropbox-Api-Arg" header, not in the body of the request. Take a look at the example curl requests in the documentation to get the hang of this.

So you'll want something like this (completely untested):

private string CallContent(string endpoint, string access_token, string json) {
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(endpoint);
    request.Headers.Add("Authorization", "Bearer " + access_token);
    request.Headers.Add("Dropbox-API-Arg", json);
    request.Method = "POST";
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
    Stream dataStream = response.GetResponseStream();
    StreamReader reader = new StreamReader(dataStream);
    string txtResponse = reader.ReadToEnd();
    return txtResponse;
}