Hello Daniel and Alex, First, thank you both for your reactivity. I appreciate a lot !
My main question is: why? I was expecting this question. Unfortunately, I cannot answer it. Just consider it is a research job. HTTP/2 might be a solution, but I would like to exploit HTTP/1.1 as far as possible. Or is there a chance that you're actually talking about doing N transfers > in parallel using N connections? I'm just downloading a single file from a single server using one connexion. I a perfect world, with 2 pipelines, range request should continue like a single download. But in reality, with some latency (from 10ms to 300ms), it is not the case. This is maybe the magic and evil ;) We performed a first test, using python. Once half the request (20kB only) has been downloaded, we start a new request. This is a bit like if we were using 2 pipelines. This way all the bandwidth is consumed. Doing the same using licurl, with 2 pipelines, doesn't give the same throughput. Do you have any idea about this ? Thanks, Alex B. 2016-05-03 15:56 GMT+02:00 Alex Bligh <[email protected]>: > > On 3 May 2016, at 14:46, Daniel Stenberg <[email protected]> wrote: > > > My main question is: why? The only reason to do pipelining is to > overcome latency when using HTTP/1.1 - the time from the end of the > previous transfer until the next one starts. You're downloading a single > resource, so do pipelining for a single file just adds a lot of complexity > with no added benefits. > > Or to put it another way, if you want to go crazy with range headers, you > will need n separate connections to take advantage of it, not pipelining. > > But in general you would be far better off finding out why a single > connection does not maximise available bandwidth, and attempting to fix > that. > > -- > Alex Bligh > > > > > > ------------------------------------------------------------------- > List admin: https://cool.haxx.se/list/listinfo/curl-library > Etiquette: https://curl.haxx.se/mail/etiquette.html >
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