API gateway gives status 200 but browser reports error 403

Question

I am testing my API gateway to S3 bucket via a simple HTTP webform to upload an image. The web browser reports failed to load resource. However I have enabled logging on the API gateway and it is saying status 200 successful. The bucket itself has public access alllowed for now. 
The browser side console also states "missing authentication token". Now I'm wondering if the token is needed for the API gateway or S3?

Accepted Answer

This error sometimes means that you are calling the wrong endpoint in the API. I would recommend that you enable API Gateway Execution Logs to see what is happening.

Answer

Hi Uri - will give that a try. I've got logging turnied on with the default settings - I'll try to add everything and see.

Answer

Hi Urr, I've tested it again with the front end I am designing in Android Studio/Kotlin and the gateway is working perfectly with requests sent from there.  Obviosly a problem with the html in the webform. we can close this

API gateway gives status 200 but browser reports error 403

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