`request()` finalization

[apfelbox]

This changes the behavior of request()

Success Case (Promise is resolved)

IF

• JSON is valid AND
• Response status code is 2xx / 400 (400 as we pass validation errors as this value and they are "expected" errors)

Return Type

{ 
    response: Response,
    success: boolean, // true if status code is 2xx, false if 400
    data: /* payload */,
}

Failure Case: Request (Promise is rejected)

IF

• the request fails

Return Type

{ 
    error: Error,
    reason: "request_failed",
}

Failure Case: JSON (Promise is rejected)

IF

• the decoding of the JSON response fails

Return Type

{ 
    response: Response,
    error: Error,
    reason: "invalid_json",
}

Failure Case: Status Code (Promise is rejected)

IF

• the response status code is 1xx / 3xx / 4xx (except 400), 5xx

Return Type

{ 
    response: Response,
    data: any,
    reason: "status",
}