PHWinfo - Afficher un message - Are there any error-correction mechanisms in HTTP?

04/03/2006, 02h18

In article <_N2Of.96716$B94.63529@pd7tw3no>,
roberson@hushmail.com (Walter Roberson) wrote:

> In article <1141408014.533837.136960@i40g2000cwc.googlegroups .com>,
> Stefanie Wiemann <wundertier@web.de> wrote:
> >Is there any possibility to detect and correct such kind of errors at
> >the http layer?
>
> >I think there isn't but as I don't know very much about networks and
> >the different layers I'm not sure about it. But AFAIK there is the
> >TCP/IP layer which is responsible for error free data transmission, and
> >the HTTP layer on top of it which relys on this error free
> >transmission.
>
> Correct, TCP uses a 32 bit CRC to try to ensure reliable delivery.

No it doesn't, it uses a 16-bit checksum.

--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***

04/03/2006, 02h18	#6
Barry Margolin Messages: n/a Hébergeur:	Re: Are there any error-correction mechanisms in HTTP? In article <_N2Of.96716$B94.63529@pd7tw3no>, roberson@hushmail.com (Walter Roberson) wrote: > In article <1141408014.533837.136960@i40g2000cwc.googlegroups .com>, > Stefanie Wiemann <wundertier@web.de> wrote: > >Is there any possibility to detect and correct such kind of errors at > >the http layer? > > >I think there isn't but as I don't know very much about networks and > >the different layers I'm not sure about it. But AFAIK there is the > >TCP/IP layer which is responsible for error free data transmission, and > >the HTTP layer on top of it which relys on this error free > >transmission. > > Correct, TCP uses a 32 bit CRC to try to ensure reliable delivery. No it doesn't, it uses a 16-bit checksum. -- Barry Margolin, barmar@alum.mit.edu Arlington, MA * PLEASE post questions in newsgroups, not directly to me * * PLEASE don't copy me on replies, I'll read them in the group *