[Solved] Return complex object from .Net core API

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The connection reset error is due to your Action method throwing an unhandled exception, returning a 500 to the client. This happens because of the infinite loop Document => Page => Document when the serializer kicks in.
An easy way to solve this problem without breaking the relationship (you might need them even when using DTOs) is to change the default serialization process:

public IActionResult GetDocuments()
{
    var documents = ...;

    var options = new JsonSerializerSettings 
    {
        ReferenceLoopHandling = ReferenceLoopHandling.Ignore
    };

    return Json(documents, options);
}

With that said, you should always return either IActionResult or async Task<IActionResult> instead of the type directly (like IEnumerable<Document>).
Also, if you find yourself having to use the above code continuously, you might want to change the default options at the application level in Startup

solved Return complex object from .Net core API