The only way to avoid HTTP errors is to prevent clients from connecting to the server.

为了避免HTTP错误的唯一方法是防止客户端连接到服务器。

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If there was no callback function provided, the send function blocks and waits until the server response arrives, or else it raises HTTP errors.

如果没有提供回调函数，那么send函数阻塞，一直等到服务器响应到达，或者引发HTTP错误。

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But they make sure that the business logic is invoked, that the controller logic doesn't detect any errors, and that the right HTTP response is achieved.

但是它们可以保证调用了业务逻辑，保证控制器逻辑没有检测到任何错误，并保证得到了正确的HTTP响应。

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