Always get 401 Unauthorized when use the access token to access the API

[bugsmachine]

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I am studying how to use GitHub OAuth login in my school's coursework which is a frontend and backend separated project. I am using spring boot as the backend. Now I can get the access token and always get 401 Unauthorized when using the token to apply for user information.

Here is my Java code and the error info.

I tried many times, I tried "Bearer" and "bearer"... But bot not working. I do not why. I use several GitHub accounts to test and always get the same error. The token is correct and it is not expired that I am sure.

How to fix this? What is my problem?

[bugsmachine]

The client ID and client secret are correct. I can use the ID and secret to exchange the access token using the code returned by GitHub.
The error happened when I used the token to apply user data. The token seems invalid and expired because got a 401. But I CAN SURE the token is new and correct.

[bugsmachine]

I figured it out, the HTTP header for authentication is not "Bearer". It should be "Token " and it worked after I made this modification.