How to make a get MS Graph Request with access code?

Question

I'm trying to list items from some list in Office 365 SharePoint from a java native Windows app.

I'm using deprecated office-365-java-sdk to authenticate and get an access token. Yes, this SDK is deprecated but authentication still works. So, I have an access token.

So, next step is to make GET request. In Graph Explorer this URL works fine:

/v1.0/sites/root/lists/{site-id}/items

I followed documentation to build the request and I have to add a header with authentication token so this is my code:

StringBuilder result = new StringBuilder();
URL url = new URL("https://graph.microsoft.com/v1.0/sites/root/lists/{0a506dcb-ecbc-40ed-bf2c-5912e78e3ca8}/items");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Authorization", "Bearer " + access_token);
conn.setRequestProperty("Content-type", "application/json");
BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = rd.readLine()) != null)
{
    result.append(line);
}
rd.close();
System.out.println(result.toString());

Authentication is working, because if access token header is not added, it returns a status error code of 401 Required authentication information is either missing or not valid for the resource. But with an access code, it returns error code 400 Cannot process the request because it is malformed or incorrect.

I'm stuck with this, I read the documentation again and again and after checking URL is right using Graph Explorer, I don't know if this is not the right way to include headers or what....

change the line conn.setRequestProperty("Content-type","application/json"); to conn.setRequestProperty("accept","application/json;odata=verbose"); and check — Gautam Sheth
– Gautam Sheth, Commented Oct 30, 2017 at 11:48
You're right! key of header should be "accept". however i had to delete "odata=verbose" because was returning bad request also. I put the request on Postman and "application/json;odata=ver‌bose" is not supported. Please put the comment as respone and ill upvote you. — borja
– borja, Commented Oct 30, 2017 at 13:25

Gautam Sheth · Accepted Answer · 2017-10-30 13:29:29Z

1

The correct header to pass is Accept: application/json.

So, replace the conn.setRequestProperty("Content-type","application/json"); with

conn.setRequestProperty("Accept","application/json");

answered Oct 30, 2017 at 13:29

Gautam Sheth

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