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You could check if a specific HTTP header is present when a call gets made. If the header is not present, you'll throw an error, if it is then you provide the expected response with content.

In example:

const request = new Request('example.com/test', {
  method: 'GET',
  headers: new Headers({
    'Some-specific-header': 'Some-optional-value'
  })
})

fetch(request).then((response) => {
  // Handle response
})

Then at the server you'd check if the current request contains this header called
Some-specific-header. If it does, return content, else return an HTTP forbidden (403).