Proxy does not stream when fetch requests server to stream

[dsmelon]

Bug report

When I use the eventSource request, the compress:fasle is configured. The proxy has a streaming effect. However, when I use fetch request, set content-type:text/event-stream, still configure compress:false, no streaming effect.

Actual Behavior

Should have streaming effects

Expected Behavior

No streaming effects, all returned in one frame

How Do We Reproduce?

server:{type:'https'}, compress: fasle

fetch('xxx', { headers: { 'Content-Type': 'text/event-stream' } })

Please paste the results of npx webpack-cli info here, and mention other relevant information

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