defaultwebproxy - Developer IT

How to remove proxy from WebRequest and leave DefaultWebProxy untouched

- by Elephantik

I use FtpWebRequest to do some FTP stuff and I need to connect directly (no proxy). However WebRequest.DefaultWebProxy contains IE proxy settings (I reckon). WebRequest request = WebRequest.Create("ftp://someftpserver/"); // request.Proxy is null here so setting it to null does not have any effect WebResponse response = request.GetResponse(); // connects using WebRequest.DefaultWebProxy My code is a piece in a huge application and I don't want to change WebRequest.DefaultWebProxy because it is global static property and it can have adverse impact on the other parts of the application. Any idea how to do it?

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What's the difference between GlobalProxySelection.Select and WebRequest.DefaultWebProxy?

- by dr. evil

What's the difference between GlobalProxySelection.Select and WebRequest.DefaultWebProxy? Seems like they are doing the exact same thing.

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What is the relationship between WebProxy & IWebProxy with respect to WebClient?

- by Streamline

I am creating an app (.NET 2.0) that uses WebClient to connect (downloaddata, etc) to/from a http web service. I am adding a form now to handle allowing proxy information to either be stored or set to use the defaults. I am a little confused about some things. First, some of the methods & properties available in either WebProxy or IWebProxy are not in both. What is the difference here with respect to setting up how WebClient will be have when it is called? Secondly, do I have to tell WebClient to use the proxy information if I set it using either WebProxy or IWebProxy class elsewhere? Or is it automatically inherited? Thirdly, when giving the option for the user to use the default proxy (whatever is set in IE) and using the default credentials (I assume also whatever is set in IE) are these two mutually exclusive? Or you only use default credentials when you have also used default proxy? This gets me to the whole difference between WebProxy and IWebProxy. WebRequest.DefaultProxy is a IWebPRoxy class but UseDefaultCredentials is not a method on the IWebProxy class, rather it is only on WebProxy and in turn, How to set the proxy to the WebRequest.DefautlProxy if they are two different classes? Here is my current method to read the stored form settings by the user - but I am not sure if this is correct, not enough, overkill, or just wrong because of the mix of WebProxy and IWebProxy: private WebProxy _proxyInfo = new WebProxy(); private WebProxy SetProxyInfo() { if (UseProxy) { if (UseIEProxy) { // is doing this enough to set this as default for WebClient? IWebProxy iProxy = WebRequest.DefaultWebProxy; if (UseIEProxyCredentials) { _proxyInfo.UseDefaultCredentials = true; } else { // is doing this enough to set this as default credentials for WebClient? WebRequest.DefaultWebProxy.Credentials = new NetworkCredential(ProxyUsername, ProxyPassword); } } else { // is doing this enough to set this as default for WebClient? WebRequest.DefaultWebProxy = new WebProxy(ProxyAddress, ParseLib.StringToInt(ProxyPort)); if (UseIEProxyCredentials) { _proxyInfo.UseDefaultCredentials = true; } else { WebRequest.DefaultWebProxy.Credentials = new NetworkCredential(ProxyUsername, ProxyPassword); } } } // Do I need to WebClient to absorb this returned proxy info if I didn't set or use defaults? return _proxyInfo; } Is there any reason to not just scrap storing app specific proxy information and only allow the app the ability to use the default proxy information & credentials for the logged in user? Will this ever not be enough if using HTTP? Part 2 Question: How can I test that the WebClient instance is using the proxy information or not?

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HttpWebRequest giving "target machine actively refused" error

- by user1371314

I am trying to access a URI through HttpWebRequest and am getting the "target machine actively refused" error. I know from a machine that has no proxy this works fine and i know my corp internet uses a PAC file to determine the proxy however it doesnt seem to be picking this up for me. Here is what i know: My app.config has I presume i dont need to specify WebRequest.DefaultWebProxy but that makes no difference I can explictly set the proxy with WebProxy and NetworkCredentials which works Any ideas? Anybody have experience with PAC files and why I can access the target through IE but not through code. obviously if i hardcode the proxy it all works so it would seem that this same proxy is not being auto detected?

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Codemetric optimized httpwebrequest in C#

- by Omegavirus

Hello, the problem is the httpwebrequest method in my c# program. visual studio gives it a metric of 60, thats pretty lame.. so how can i program it more efficient? (: my actual code: public string httpRequest(string url) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Method = "GET"; request.Proxy = WebRequest.DefaultWebProxy; request.MediaType = "HTTP/1.1"; request.ContentType = "text/xml"; request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.2.12) Gecko/20101026 Firefox/3.6.12"; HttpWebResponse response = (HttpWebResponse)request.GetResponse(); StreamReader streamr = new StreamReader(response.GetResponseStream(), Encoding.UTF8); String sresp = streamr.ReadToEnd(); streamr.Close(); return sresp; } thanks for helping. ;)

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.NET proxy detection

- by Ziplin

I am having an issue with .NET detecting the proxy settings configured through internet explorer. I'm writing a client application that supports proxies, and to test I set up an array of 9 squid servers to support various authentication methods for HTTP and HTTPs. I have a script that updates IE to whichever configuration I choose (which proxy, detection via "Auto", PAC, or hardcode). I have tried the 3 methods below to detect the IE configuration through .NET. On occassion I notice that .NET picks up the wrong set of proxy servers. IE has the correct settings, and if I browse the web with IE, I can see I am hitting the correct servers via wireshark. WebRequest.GetSystemWebProxy().GetProxy(destination); GlobalProxySelection.Select.GetProxy(destination); WebRequest.DefaultWebProxy Here are the following tips I have: My script sets a PAC file on a webserver, and updates the configuration in IE, then clears IE's cache .NET seems to get "stuck" on a certain proxy configuration, and I have to set another configuration for .NET to realize there was a change. Occasionally it seems to pick some random set of servers (I'm sure they're not random, just a set of servers I used once and are in some cached PAC file or something). As in, I will check the proxy for the destination "https://www.secure.com" and I may have IE configured for and thus expect to get "http://squidserver:18" and instead it will return "http://squidserver:28" (port 18 runs NTLM, 28 runs without authentication). All the squid servers work. This does not appear to be an issue on XP, only Vista, 2003, and windows 7. Hardcoding the proxy servers in IE ALWAYS works Time always solves the issue - if I leave the computer for about 20 or 30 minutes and come back, .NET picks up the correct proxy settings, as if a cached PAC script expired.

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