example express auth throw error: "You must provide a client_id"

[Glowin]

I run example express auth, but throw error:

{"error_type":"OAuthException","code":400,"error_message":"You must provide a client_id"}

I think the problem is header, change content-type to application/x-www-form-urlencoded maybe solve this problem.

refer: https://stackoverflow.com/questions/33541677/instagram-api-unable-to-request-access-token

[pradel]

Hey can you try the latest version I just pushed? It should be fixed. Thanks for pointing this issue.

[Glowin]

Great, it's fix 400 error, Thank you for your contribution.