Dropbox list_folder api javascript not working

Question

var xhr = new XMLHttpRequest();
xhr.responseType = 'String';
xhr.onreadystatechange = function() {
  if (xhr.readyState === 4 && xhr.status === 200) {
    var response = xhr.response;
    console.log(response);
  }
};
xhr.open('POST', 'https://api.dropboxapi.com/2/files/list_folder');
xhr.setRequestHeader('Authorization', 'Bearer ' + token);
xhr.setRequestHeader('Content-Type', 'application/json');
xhr.setRequestHeader('Dropbox-API-Arg', JSON.stringify({
  path: '/lol'
}));
xhr.send();

I can't figure out what seems wrong in the code. Any Help?

I am getting a has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource — Rohit Kumar
– Rohit Kumar, Commented Jul 31, 2020 at 13:11

Andrew L · Accepted Answer · 2017-10-13 19:03:53Z

1

Looking at documentation for list_folder - that endpoint is a RPC endpoint:

These endpoints accept arguments as JSON in the request body and return results as JSON in the response body. RPC endpoints are on the api.dropboxapi.com domain.

Dropbox-API-Arg header seems to be used for Content-upload and Content-download type endpoints

I do not see anything about a header called Dropbox-API-Arg needed for /files/list_folder endpoint. Try something like

xhr.open('POST', 'https://api.dropboxapi.com/2/files/list_folder');
xhr.setRequestHeader('Authorization', 'Bearer ' + token);
xhr.setRequestHeader('Content-Type', 'application/json');
xhr.send(JSON.stringify({path:"/lol"}));

answered Oct 13, 2017 at 19:03

Andrew L

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1 Comment

Rohit Kumar Over a year ago

I am getting a has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource

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