The point is that an HTTP request never ends. Not all client implementations handle this correctly. As I see it, it is possible to do this using pure javascript in Firefox with its extensive API, but the XMLHTTPRequest object will time out and will not be able to transmit content to you.
IFrame is good, you can also try an object tag if it meets the compliance standard.
Before XMLHTTPRequest and Ajax did not have a name, we used to receive data from servers through IFrames.
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