Re: [fetch] Support full-duplex HTTP streaming (#229)

301, 302, 307 and 308 literally mean "the thing you're looking for is over there." The request is not considered completed by those status codes, so this should be safe to do.

303 is a bit different; although its use is more rare (outside of Semantic Web circles). Although if the server is processing the request, they probably really won't want to respond until they have the whole thing (for this reason as well as many others). And of course the client can choose not to RST_STREAM it.

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