GPT can't use API with actions

I’m trying to build my GPT and use my API hosted on a different server. API returns only text and it works everywhere. But GPT still can’t see it:

In my browser:

On the server:

My schema is the following:

openapi: 3.0.0
  title: Screenshot API
  description: API to interact with a server that provides a static image and allows taking screenshots.
  version: 1.0.0
  - url: https://server
    description: Main server hosting the pictures and chat functionality.
      operationId: getChat
      summary: Retrieves the latest chat messages.
      description: Returns the latest chat messages at the specified URL.
          description: Latest chat messages.
                type: string

Did you update the server url in the schema with your

This is a handy sidekik:

Of course, but I’m not revealing it publicly.
So, should I buy a domain? Because I’m using a self-signed cert on my server.

You can also ask your gpt what the error was. That has worked for me.

So GPT could not help.
I resolved it by getting a trusted HTTPS.

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