Re: How to get proxy settings for use with CFStream?
Re: How to get proxy settings for use with CFStream?
- Subject: Re: How to get proxy settings for use with CFStream?
- From: Josh Graessley <email@hidden>
- Date: Tue, 28 May 2013 12:59:02 -0700
Not my area of expertise, so I’m a little fuzzy on the details, but maybe this will give you a hint that will help.
Some proxy settings may involve running a java script to evaluate what proxy to use. I think that’s what kCFProxyTypeAutoConfigurationURL means. You may need to use something like CFNetworkCopyProxiesForAutoConfigurationScript to run the script.
If there’s any way you can use NSURLRequest/NSURLConnection instead, the world of hurt known as proxies will no longer be your problem :)
-josh
On May 28, 2013, at 12:51 PM, Jens Alfke <email@hidden> wrote:
> I have some code that uses CFReadStreamCreateForHTTPRequest to send an HTTP request. I have a bug report that this fails with a POSIX error 60 (ECONN) in an environment where a proxy server has to be used to reach outside HTTP servers. I looked at the docs and sure ‘nuf, CFStream doesn’t use the system proxy settings the way NSURLConnection does. Crap.
>
> I added the following code, but the user reports that it still doesn’t work for him:
>
> CFDictionaryRef proxySettings = CFNetworkCopySystemProxySettings();
> if (proxySettings) {
> CFArrayRef proxies = CFNetworkCopyProxiesForURL((__bridge CFURLRef)url, proxySettings);
> if (CFArrayGetCount(proxies) > 0) {
> CFTypeRef proxy = CFArrayGetValueAtIndex(proxies, 0);
> NSLog(@"Changes feed using proxy %@", proxy);
> bool ok = CFReadStreamSetProperty(cfInputStream, kCFStreamPropertyHTTPProxy, proxy);
> Assert(ok);
> CFRelease(proxies);
> }
> CFRelease(proxySettings);
> }
>
> The output of that NSLog shows that the proxy dictionary he’s getting is:
>
> { kCFProxyAutoConfigurationURLKey = "http://bgproxy.XXXX/wpad.dat";;
> kCFProxyTypeKey = kCFProxyTypeAutoConfigurationURL; }
>
> This doesn’t look right. It’s a specification of where to read the proxy settings from, not an actual proxy setting, and it doesn’t match the proxy keys defined in the CFStream documentation (i.e. “kCFStreamPropertySOCKS*”.) So how do I get the actual proxy settings?
>
> (This is complicated by the fact that I don’t have access to a firewalled network that uses an HTTP proxy, so I can’t reproduce the problem directly.)
>
> —Jens
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