OAuth example doesn't work as expected

[B-Stefan]

The example is not working because the accessToken is invalid for the /profiles request.
This causes the 401 response from the Buffer API.

A possible explanation is that https://api.bufferapp.com/1/oauth2/token.json returns an API token with inadequate scopes. Or the OAuth lib has been configured incorrectly.

Steps to reproduce

1. Create a new Buffer app with the redirect url: http://127.0.0.1:9999/oauth/callback
2. Download go-buffer v0.0.1
3. ./go-buffer -clientId <YourClientId> -clientSecret <YourClientSecret>
4. Follow the OAuth process
5. See error message inside console

Used tools

• go version go1.11.1 darwin/amd64
• golang.org/x/oauth2

Output

2019/01/08 00:21:50 You will now be taken to your browser for authentication
2019/01/08 00:21:52 Authentication URL: https://bufferapp.com/oauth2/authorize?access_type=online&client_id=5c32a3174b1be71532161683&redirect_uri=http%3A%2F%2F127.0.0.1%3A9999%2Foauth%2Fcallback&response_type=code&state=state
2019/01/08 00:21:54 code: 1/758a743876aed......
2019/01/08 00:21:55 Token: &{1/3ddd71......   0001-01-01 00:00:00 +0000 UTC map[access_token:1/3ddd7.......scope:<nil>]}
2019/01/08 00:21:55 Authentication successful
2019/01/08 00:21:55 Invalid request. Status code was 401

Performed request

Here is the curl representation of the request that the go-buffer lib has executed

curl -X GET \
  https://api.bufferapp.com/1/profiles.json \
  -H 'authorization: Bearer 1/3ddd71......' \
  -H 'cache-control: no-cache' \
  -H 'content-type: application/x-www-form-urlencoded' 

Response: 
{
    "error": "The provided access token is invalid",
    "code": 401
}

Expected behavior

• /profiles should return 200 as status code
• /profiles should return the profiles for the user

[B-Stefan]

Reported to buffer support team for further investigation.

[B-Stefan]

Got response from Buffer Team.
There is a need to reproduce this problem without any library. For example, create a more general approach to reproduce this issue. E.g. a bash script with curl commands.