Solved

HttpWebRequest Open Connection

Posted on 2013-06-04
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Last Modified: 2013-06-05
I cannot imagine why this has been so hard for me.

I'm trying to post some XML to a site...which I can do and get the initial response

I then want to keep that connection open indefinately and simply accept whatever data comes at me and pass it along to SQL..

So far, I can connect...post my command...and get the initial response and send to SQL.

But I cannot get any subsequent data.

Does this need to be done with Threading?  Async?
I'm lost.
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Question by:lrbrister
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Expert Comment

by:Ron Malmstead
ID: 39223286
I don't believe this is possible.

The web server gets a request, and returns a response.
To get more responses, you have to send more requests.

Curious to see other experts input on this.
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Author Comment

by:lrbrister
ID: 39223623
xuserx2000,

It seems to me that as long as I send an HTTP 1.1 command and keep the connection alive and also get chuncked data...that should do it.

Can someone let me know if my logic is flawed, and if so, why

and

What would another solution be?
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Expert Comment

by:Ron Malmstead
ID: 39223655
Possibly async client side java code, using ajax?
..that would be my best guess.
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Author Comment

by:lrbrister
ID: 39223664
xuserx2000P

Any links to a solution that you know of?
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Expert Comment

by:Ron Malmstead
ID: 39223754
http://api.jquery.com/jQuery.ajax/


I still think this would be a "polling" solution though.  Seems to me the nature of a webserver is to get a url request and return a response.  A client browser renders elements when it gets a response.

Basically, you would be sending requests every "x" milliseconds to a webservice or page..from the client side java code on a timer, and processing the responses client side so the page doesn't have to be reloaded.  This would "appear" to be a continuous connection, though it actually isn't.

In a console or windows app, with a sockets connection, you could process data as it is being recieved..and leave the connection open.  But you're programming for a browser.. I just don't think it's possible, unless someone else can show me it is, that's my answer.
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Author Comment

by:lrbrister
ID: 39223862
xuserx200

Thanks.
This is being done in WinForms.

Do you have an example of a sockets connection to an outside source?
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Ron Malmstead earned 500 total points
ID: 39223877
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Author Closing Comment

by:lrbrister
ID: 39223903
Just so I have a way in, I think I can get some kind of solution

Whether its a socket...or a "polling" solution.

Thanks
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LVL 25

Expert Comment

by:Ron Malmstead
ID: 39223910
Here's another snippet I found using the WebClient class.
Looks promising...
-------------------------------------------------------------------------------------
using (var client = new WebClient())
using (var reader = new StreamReader(client.OpenRead(uri), Encoding.UTF8, true))
{
    string line;
    while ((line = reader.ReadLine()) != null)
    {
        Console.WriteLine(line);
    }
}
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