Hi all,
Is it possible to make 10 POST requests from ASP.NET asynchronously? I have
been working on this problem for a few days now, and I seem to keep running
up against IIS limitations. Basically here's the process as it works now
(synchronously) :
Person visits mywebsite.com and fills out a form
mywebsite.com POSTs one request to providerwebsite .com
mywebsite.com receives response
mywebsite.com POSTs a second request to providerwebsite .com
mywebsite.com receives response
....
mywebsite.com POSTs a tenth request to providerwebsite .com
mywebsite.com receives response
What I would like to happen is (asynchronously ):
Person visits mywebsite.com and fills out a form
mywebsite.com POSTs one request to providerwebsite .com
mywebsite.com POSTs a second request to providerwebsite .com
mywebsite.com receives a response to first request
....
mywebsite.com POSTs a tenth request to providerwebsite .com
mywebsite.com receives a response to ninth request
mywebsite.com receives a response to tenth request
The above is just an example - the responses should be able to arrive in any
order asynchronously. The problem is that each request can take up to 800
ms to respond, times 10 synchronous requests = 8 seconds... way too long...
The idea is that if I can send all ten requests asynchronously, the results
should start being returned much faster.
Is this even possible with ASP.NET and IIS?
Nov 14 '06
14  2558 
"Mike C#" <xy*@xyz.comwro te in message
news:8b******** ********@newsfe 12.lga...
>
"John Saunders" <john.saunder s at trizetto.comwro te in message
news:u9******** ******@TK2MSFTN GP03.phx.gbl...
>"Mike C#" <xy*@xyz.comwro te in message
news:y6******* ******@newsfe11 .lga...
>>Hi all,
Is it possible to make 10 POST requests from ASP.NET asynchronously? I
have been working on this problem for a few days now, and I seem to keep
running up against IIS limitations. Basically here's the process as it
works now (synchronously) :
It is an IIS limit, as you say. It has nothing to do with ASP.NET.
The only ASP.NET relation is that you probably aren't calling Dispose on
your proxy objects, so you're not closing the connections.
John
I'm properly disposing of everything, so it falls back to IIS? Thanks.
It still has nothing to do with IIS, especially not on Windows Server 2003.
IIS is not involved - the network message goes straight from HTTP.SYS into
the ASP.NET worker process (w3wp).
Thus wrote Mike C#,
Thus sayeth Joerg Jooss,
>That is not likely -- the processing time for an individual request
does not improve by a client-side optimization. If resource
contention comes into play, it may even get worse. Yet, the overall
processing time for the page that kicks off those 10 requests should
be reduced unless you have a severe bottleneck in your system (such
as a deadlock).
I'm not trying to reduce the processing time for individual requests.
That is a constant I have no control over, like the speed of light. I
am trying to reduce the load time of my page by making 10 requests
asynchronously instead of 1 request...wait. ..1 response...1
request...wait. ..etc. synchronously.
>>Is this even possible with ASP.NET and IIS?
The 10 connections limitation only applies for non-server Windows
versions. It is not an IIS issue per se.
I ran into this particular problem on Windows Server 2003. I'm told
by a co-worker that there are some limitations built into the HTTP
standard which may be the root of my problem. He also suggested there
is some registry setting to get around it, but he couldn't tell me
where he found this information, so I'll keep Googling it.
Ah, silly me. Forgot that all these requests access the same site.
Yes, HTTP 1.1 recommends to limit the number of persistent and non-persistent
connections to a site to 2 and 4 respectively. In ASP.NET, this value is
10 by default.
You can override this value using ServicePointMan ager.DefaultPer sistentConnecti onLimit
or in config:
<configuratio n>
<system.net>
<connectionMana gement>
<add address = "*" maxconnection = "2" />
</connectionManag ement>
</system.net>
</configuration>
BTW, the registry keys you're looking for have been described in microsoft.publi c.dotnet.langua ges.csharp
just two days ago.
Cheers,
--
Joerg Jooss ne********@joer gjooss.de
Thus wrote Joerg,
[...]
Ah, silly me. Forgot that all these requests access the same site.
Geez,
make that "requests originate from the same site".
--
Joerg Jooss ne********@joer gjooss.de
"John Saunders" <john.saunder s at trizetto.comwro te in message
news:uK******** ******@TK2MSFTN GP03.phx.gbl...
It still has nothing to do with IIS, especially not on Windows Server
2003. IIS is not involved - the network message goes straight from
HTTP.SYS into the ASP.NET worker process (w3wp).
I gave up on it and created a separate class that calls WinHTTP directly.
It's a lot more work, but it's fasssst.
Thanks.
"Joerg Jooss" <ne********@joe rgjooss.dewrote in message
news:94******** *************** ***@msnews.micr osoft.com...
Ah, silly me. Forgot that all these requests access the same site.
Yes, HTTP 1.1 recommends to limit the number of persistent and
non-persistent connections to a site to 2 and 4 respectively. In ASP.NET,
this value is 10 by default.
You can override this value using
ServicePointMan ager.DefaultPer sistentConnecti onLimit or in config:
<configuratio n>
<system.net>
<connectionMana gement>
<add address = "*" maxconnection = "2" />
</connectionManag ement>
</system.net>
</configuration>
BTW, the registry keys you're looking for have been described in
microsoft.publi c.dotnet.langua ges.csharp just two days ago.
Thanks Joerg. I went ahead and wrote a class to access WinHttp functions
directly. It's hella fast, and works great. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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