Gravity Forms API always 401
For mine case it was that I haven't clicked the update button "Web API" Tab.
Make sure you click update button , although it does show the API Key's but still you have to click update button to enable API.
I was getting the same thing due to some weirdness about the route endpoint. When calculating the signature you don't use a trailing slash on the route: forms/1.
But you do use a trailing slash in the URL (otherwise I got a 301 Moved Permanently):
http://demo.gravityforms.com/gravityformsapi/the_route/?api_key...
It looks odd to have /?api_key... but that is what works for me.
Here's the ruby example I was using with the demo credentials:
GravityFormsAPI.generate_URL(site: 'demo.gravityforms.com', route: 'forms/1', public_api_key: '5b225f8382', private_api_key: 'fc6d1bc71d2ebfc')
Hope this helps.
Sometimes i received intermittent 401 error after a lot of research i find this article
Azure DocumentDB Intermittent 401 error when querying REST API via Obj-c
If the signature contains + sign i received 401 error
Maybe that help other person
Sorry for my english writing