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RE: Nature of Application Protocols!

From: Naresh Agarwal <nagarwal@in.firstrain.com>
Date: Thu, 29 Aug 2002 14:31:25 +0530
Message-ID: <205C5F16CA92F94484F054E94520F4D708F100@mail.in.firstrain.com>
To: "Martin Duerst" <duerst@w3.org>, <ietf-http-wg@w3.org>

Hi Martin,

Can you elaborate, why SMTP is Push?

First, let me tell you, what i think of Push and Pull.
Please correct me, if i'm wrong.

Pull: You make a request to fetch some data (Request-Response)
Push: You receive some data, without making a request. (No Request, Only Response)

In case of SMTP, data, i.e, mails are pushed to SMTP servers.
But finally, one've to use POP/IMAP to fetch the mails. 

Don't this mean that SMTP is pull rather than push?

thanks,
regards,
Naresh Agarwal

> -----Original Message-----
> From: Martin Duerst [mailto:duerst@w3.org]
> Sent: Thursday, August 29, 2002 2:18 PM
> To: Naresh Agarwal; ietf-http-wg@w3.org
> Subject: RE: Nature of Application Protocols!
> 
> 
> 
> Well, SMTP is definitely push. FTP can be used both ways.
> Roughly upload = push, download = pull.     Martin.
> 
> At 14:08 02/08/29 +0530, Naresh Agarwal wrote:
> 
> >I'm sorry..it was a typo error...
> >
> >i meant to say that -
> >
> >HTTP, FTP, SMTP, POP, IMAP etc. are "Syncronous", 
> "Connection Less" and 
> >"Pull" in nature.
> >
> >regards,
> >Naresh Agarwal
> >
> > > -----Original Message-----
> > > From: Martin Duerst [mailto:duerst@w3.org]
> > > Sent: Thursday, August 29, 2002 1:27 PM
> > > To: Naresh Agarwal; ietf-http-wg@w3.org
> > > Subject: Re: Nature of Application Protocols!
> > >
> > >
> > >
> > > HTTP is synchonous, but very much pull, not push.
> > >
> > > Regards,    Martin.
> > >
> > >
> > > At 12:39 02/08/29 +0530, Naresh Agarwal wrote:
> > >
> > > >Hi
> > > >
> > > >I have some general questions regarding protocols.
> > > >
> > > >Every application protocol is -
> > > >
> > > >1)Synchronous or Asynchrnous
> > > >2)Connection Less or Connection Oriented
> > > >3)Push or Pull
> > > >
> > > >My understanding is that most of the protocols - HTTP, FTP,
> > > SMTP, POP,
> > > >IMAP etc. are "Syncronous", "Connection Less" and "Push" 
> in nature.
> > > >
> > > >I could not find any protocol, which is widely used and is
> > > Asynchronus,
> > > >Connection Oriented and Pull in nature!
> > > >
> > > >Am i right or i'm missing something?
> > > >
> > > >Also does Synchrony and Pull, Asynchrony and Push are
> > > synonyms..i.e every
> > > >Synchronous protocol is Push and every Asynchronous protocol
> > > is Push..?
> > > >
> > > >Can somebody provide me with the explanation of above (if
> > > possible, with
> > > >examples)?
> > > >
> > > >thanks,
> > > >regards,
> > > >Naresh Agarwal
> > >
> > >
> 
> 
Received on Thursday, 29 August 2002 05:00:13 GMT

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