Re: HTTPhandlers

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From: Richard Blewett [DevelopMentor] (richardb_at_develop.com)
Date: 09/14/04 

To: microsoft.public.dotnet.framework
Date: Tue, 14 Sep 2004 09:21:45 -0700

The link you provided does not explain how to hold a connection open over HTTP - unless the answers to the query do, but this requires a subscription which I'm not prepared to pay. Is there any other way for me to be able to see the technique that keeps an HTTP based connection active over a long period? As far as I know, any HTTP server is going to nuke the connection from the server side after about 30 seconds of inactivity.

 Regards

 Richard Blewett - DevelopMentor

 http://staff.develop.com/richardb/weblog

 nntp://news.microsoft.com/microsoft.public.dotnet.framework/<90FD5583-89F9-4847-893B-ABE87226BFB7@microsoft.com>

   As I explan in the link I provided I CAN keep the connection open using the
 HTTP protcol. HTTP is nothing more then a pre defined set of commands so HTTP
 in itself is not stateless. I am not looking to debate wether my ChatServer
 works or not because it does work.
 The only problem I have is I use a TcpListener and I cannot use that on port
 80 becuase IIS is already listening on that port and I need my program to
 work on port 80.
 
 
 "Girish Bharadwaj" wrote:
 
> One thing you can probably do is to have a different port based server to
> which you make the request to do the connection with the user and maintain
> that connection. But, as Richard says, you cannot get there from here.
>
>
> --
> Girish Bharadwaj
> http://msmvps.com/gbvb
> "Richard Blewett [DevelopMentor]" <richardb@develop.com> wrote in message
> news:ejE9wNlmEHA.1136@TK2MSFTNGP10.phx.gbl...
> > What you NEED and whether the communications protocol you have selected
> can support it are two different issues.
> >
> > HTTP is a stateless protocol. You cannot keep connections open over long
> periods (keep-alives are not desined for this).
> >
> > So sorry, you cannot toake the approach you want with HTTP
> >
> > Regards
> >
> > Richard Blewett - DevelopMentor
> >
> > http://staff.develop.com/richardb/weblog
> >
> >
> >
> >
> nntp://news.microsoft.com/microsoft.public.dotnet.framework/<4728F0E6-586C-4E87-A5E1-D530EE13C864@microsoft.com>
> >
> > I NEED to maintain an active connection to be able to create an efficient
> > chat application on port 80 without the use of flash or java or active x.
> > Please read this link:
> http://www.experts-exchange.com/Programming/Programming_Languages/Dot_Net/Q_21129241.html
> > It explains what I want to do.
> >
> > It comes down to that I have written this very efficient DHTML chat
> server
> > that maintains an active connection with the browser. But I use a
> TcpListener
> > to make it work and this means I cannot have the DHTML server work on
> port 80.
> > So I figured to use HTTPhandler to intercept certain requests on port 80
> and
> > pass them to the DHTMLchatServer.
> >
> > Any advice would be welcome
> >
> >
> > "Girish bharadwaj" wrote:
> >
> > > If you look at the help for HttpContext: " Encapsulates all
> HTTP-specific
> > > information about an individual HTTP request. ". By definition, Context
> is
> > > only per request. If you want more that information or want to do
> something
> > > across invocations, you might have to consider some of the state
> management
> > > schemes presented by ASP.NET such as Cookies, ViewState, Session
> > > ,Application or Cache.
> > >
> > > --
> > > Girish Bharadwaj
> > > http://msmvps.com/gbvb
> > > "John Saunders" <johnwsaundersiii@notcoldmail.com> wrote in message
> > > news:%238$f0zemEHA.2788@TK2MSFTNGP10.phx.gbl...
> > > > "daFou" <daFou@discussions.microsoft.com> wrote in message
> > > > news:1F690C94-2FB5-43F8-B295-EC981805906E@microsoft.com...
> > > > > Hi ALl,
> > > > >
> > > > > How do I prevent the ProcessRequest method from the IHttpHandler
> Class
> > > > from
> > > > > closing the http connection and killing the context after the
> > > > ProcessRequest
> > > > > method has ended.
> > > > >
> > > > > TO further explain what I want please read this link:
> > > > >
> > > >
> > >
> http://www.experts-exchange.com/Programming/Programming_Languages/Dot_Net/Q_21129241.html
> > > >
> > > > Q: How do I prevent ProcessRequest from closing the connection when
> it's
> > > > done?
> > > > A: You don't
> > > >
> > > > ASP.NET doesn't work that way. It's all about request/response. Once
> the
> > > > response has been sent, the request is over and gone, as though it
> had
> > > never
> > > > existed (except for anything persistent which the request may have
> done).
> > > >
> > > > If you need to keep connections open for an indefinite period of
> time,
> > > then
> > > > you need to stop using ASP.NET.
> > > > --
> > > > John Saunders
> > > > johnwsaundersiii at hotmail
> > > >
> > > >
> > >
> > >
> > >
> >
> > ---
> > Incoming mail is certified Virus Free.
> > Checked by AVG anti-virus system (http://www.grisoft.com).
> > Version: 6.0.760 / Virus Database: 509 - Release Date: 10/09/2004
> >
> >
> >
> > [microsoft.public.dotnet.framework]
>
>
>
 
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