Google OAuth token exchange returns invalid_code

Question

I have been implementing the Google web server OAuth flow, but when I attempted to exchange the authorization code with access token, it always complains \"invalid_code\".

Answer 1

I was using http://localhost:8080 as my redirect url since I was just trying out their examples. And my json file contents had this:

"redirect_uris": [
  "http://localhost:8080"
],
"javascript_origins": [
  "http://localhost:8080"
]

In the developer console I had the redirect_uri set to "http://localhost:8080" and I was getting the same error. I changed it to "http://localhost:8080/" and then it started working. (Essentially adding a '/' at the end.)

Hope this helps!