Re: [Cerowrt-devel] [Bloat] blip: a tool for seeing internet latency with javascript

[Maciej Soltysiak <maciej@soltysiak.com>]

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At home with latest cero, I'm getting results similar to Rich.

I'm wondering how this will look tomorrow when I run it at company network,
which is incredibly complex WAN path, proxied, with things like riverbed
and checkpoint along the way.

Maciej



On Sun, Apr 28, 2013 at 4:56 PM, Rich Brown <richb.hanover@gmail.com> wrote:

> This is indeed a cool hack. I was astonished for a moment, because it was
> a bedrock belief that you can't send pings from Javascript. And in fact,
> that is still true.
>
> Apenwarr's code sends short HTTP queries of the format shown below to each
> of two hosts:
>
> http://gstatic.com/generate_204
> http://apenwarr.ca/blip/
>
> The Blip tool shows ~60-70ms for the gstatic host, and ~130 msec for the
> latter. Ping times are ~52 msec and 125msec, respectively. These times seem
> to track response times by my eye (no serious analysis) to load both on my
> primary (bloated) router and CeroWrt.
>
> Still a cool hack.
>
> Rich
>
> -------------------------
> HTTP Request & Response for typical blip "ping"
>
> OPTIONS /generate_204 HTTP/1.1
> Host: gstatic.com
> Connection: keep-alive
> Access-Control-Request-Method: GET
> Origin: http://gfblip.appspot.com
> User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_3)
> AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.65 Safari/537.31
> Access-Control-Request-Headers: accept, origin, x-requested-with
> Accept: */*
> Referer: http://gfblip.appspot.com/
> Accept-Encoding: gzip,deflate,sdch
> Accept-Language: en-US,en;q=0.8
> Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
>
> HTTP/1.1 204 No Content
> Content-Length: 0
> Content-Type: text/html; charset=UTF-8
> Date: Sun, 28 Apr 2013 12:37:17 GMT
> Server: GFE/2.0
>
>
> On Apr 26, 2013, at 7:04 PM, Dave Taht <dave.taht@gmail.com> wrote:
>
> > Apenwarr has developed a really unique tool for seeing latency and
> > packet loss via javascript. I had no idea this was possible:
> >
> > http://apenwarr.ca/log/?m=201304#26
> >
> >
> >
> > --
> > Dave Täht
> >
> > Fixing bufferbloat with cerowrt:
> http://www.teklibre.com/cerowrt/subscribe.html
> > _______________________________________________
> > Bloat mailing list
> > Bloat@lists.bufferbloat.net
> > https://lists.bufferbloat.net/listinfo/bloat
>
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