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POCreating robust HTTP connection for dummy users with WinINET
 

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  1. POCreating robust HTTP connection for dummy users with WinINET
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    <p>I'm making a program which downloads a simple file from internet on Windows, using Wininet family API because I want to utilize its IE-compatible proxy behavior. As you all know, current IE has several proxy settings: auto-detect (WPAD), auto-configure (PAC), manually single URL, proxy servers per protocol, socks, direct, ... For most users, the "direct download" works fine; however for some users (especially those behind firewall / NAT), they always need special proxy settings when making connections.</p> <p>It's painful to write code to handle all these cases so I hope WinINET with <code>InternetOpen (INTERNET_OPEN_TYPE_PRECONFIG)</code> can help me. It does for most users, however I still find some users complaining connection failure. These user may have very special network environments (eg, need username/password auth for proxy) and direct connection does not work for them.</p> <p>Sometimes dummy users had wrong configuration, and I'd like wininet to try "all" possible proxy settings for me; unfortunately the <code>INTERNET_OPEN_TYPE_PRECONFIG</code> will only try the one that user configured, not "every possible proxy settings".</p> <p>So my question is, how do I make a program with most strong ability to workaround all http connection (especially for proxy configuration) for dummy users (i.e, they don't understand how to configure their system)? Is there any suggested way to make HTTP connections without the need to take care of proxy stuff? (i.e., a "super" connection solver which will try all possible proxy settings), or if there's any method to tell WinINET to enable all its proxy settings to create connection?</p>
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    1. USJustin Grant
    1. USFrancis
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    1. COFrancis, I've encountered this problem. The simple solution does not exist; there are too many variables and grinding through the scenarios as Justin describes is the only sure-fire method. Even worse, that is all only for Internet Explorer -- with the growing market share of Firefox, methods to get Firefox proxy settings should be added for a complete list.
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    2. CO@J.J. - Good point. I thought about the firefox case when I originally wrote the answer and was going to come back to add a step about Firefox. Your comments reminded me to do this! See new step #4 below. :-)
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      1. USJustin Grant
    3. COToo bad there is no simple solution... It's also interesting that there's also no library wrapping all these painful stuff. I've tried libcurl and libproxy, but they are in fact working in their own way and does not really work like IE's way.
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