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05.24.2004 at 12:54PM PDT, ID: 21000505
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Finding a proxy server for my application to use with a given URL

Tags: proxy, settings, detect
When there is no proxy server, my client software can do an http request and
get data from our server.  I know how to use a proxy server to make it work
when I know which proxy server and port to use.
The problem is that windows has so many ways to specify a proxy server in the control
panel for Internet Settings that I can't easily figure out which proxy server to use.
   - sometimes there is just one fixed proxy server
   - sometimes the server depends on the protocol
   - sometimes a javascript is used to figure out the proxy server
   - sometimes it uses "Automatically Detect Settings" to find the proxy server
Does windows have any API that I can use so that when I give it the URL I want
to connect to, it can return the proxy server and port that I need to use for this
connection?

If there is a standard API, then C/C++ functions or examples would be preferred.
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Question Stats
Zone: Programming
Question Asked By: bjornsone
Solution Provided By: jkr
Participating Experts: 1
Solution Grade: A
Views: 0
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05.24.2004 at 02:19PM PDT, ID: 11146775

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05.25.2004 at 05:38AM PDT, ID: 11151125

Rank: Genius

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05.27.2004 at 09:36PM PDT, ID: 11177431

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05.24.2004 at 02:19PM PDT, ID: 11146775
I found that WebProxy.GetProxy in the .NET framework could do the job, but I
don't want to force users to install .NET in order for our program to use the network.
Is there any way of using the standard windows functions to do this same
job without requiring any big installs?
 
05.25.2004 at 05:38AM PDT, ID: 11151125

Rank: Genius

The problem is that usually each piece of SW (i.e. browsers) handles it's own proxy settings. You could use e.g. http://support.microsoft.com/default.aspx?scid=kb;en-us;226473 ("HOWTO: Programmatically Query and Set Proxy Settings Under Internet Explorer")
Accepted Solution
 
05.27.2004 at 09:36PM PDT, ID: 11177431
The suggested answer does not actually give the proxy server in all cases.
The example shows that you can find out if the setting is autodetect or what
URL is specified for the java script, but it doesn't actual resolve this down to
what proxy server to use as a function of the desired url.

I did find functions in WinHttp.lib that support the required functionality.
Thanks for the help.
 
 
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