How to set Winhttp proxy Windows?
In this article we are going to discuss the configuration and usage of a proxy for WinHTTP in Windows. A proxy server, as its name indicates, does two tasks: First it receives incoming requests to the hostname of the proxy, then it forwards the request to the target host on the remote network. For instance, you may be writing a web browser at your computer and want to access Yahoo Finance website but unfortunately you are behind your company firewall, which intercepts incoming connections by default. In that case your browser gets the IP address of the proxy server but the proxy server, because it is behind the firewall, can not forward the request to the correct website. So if your browser has an option to set a proxy settings then your proxy settings will allow you to connect to the target host. You can either use the same proxy settings you used before, or you can create a new proxy settings (ie you will select another proxy) for each connection with the proxy server. For this purpose you need to understand Winhttp.
There are four interfaces in Winhttp; you can specify any of them. The WinHttpSetProxy function sets both outgoing and incoming proxies, and WinHttpSetOption sets the outgoing proxy only. The function returns WINHTTPERRORPROXYINUSE if the request must be resent to the proxy. WinHttpGetProxyForUrl() returns a proxy identifier to be set as the outgoing proxy. WinHttpSetProxy uses the first protocol family specified (WinHttpProtocolFamilies) for both outgoing and incoming proxy servers. With WinHttpSetOption it is possible to set the proxy server only for incoming requests (for instance, you have some dynamic IP address, which changes frequently. If you want to change the host you visited only at some particular times you may want to specify your specific IP addresses for incoming requests).
When you use WinHttpSetProxy() function it sets both outgoing and incoming proxies. For instance, if you want to set Winhttp proxy server to "www.microsoft.com", for outgoing traffic and you want to specify port 8080 for incoming traffic, you can use the following example.
In this case, WinHttpSetProxy() function sets the Winhttp proxy as both the outgoing and incoming proxy, and sets 8080 port for incoming traffic.
How do I set proxy settings in Winhttp?
I have some old Winhttp code that connects to a remote site.
The connection works fine except that I get an error indicating I am on a proxy server and the remote site wants my UserAgent to be changed from HTTP/1.0 to HTTP/1.
The code was written before the problem became critical so it does not even contain my username or password. I tried adding the proxy details in the code but no luck.
Dim Http As New WinHttp.WinHttpRequest Try. Http.CookieContainer = New CookieContainer() Http.KeepAlive = True Http.Proxy = Proxy Http.Address = "proxy.com:3128"
Http.BypassRules.Add()
Http.ProxyAuthentication = False Http.UseProxy = True 'This connection is good. Http.Open("GET", "") Http.Send() Catch ex As WebException. MessageBox.Show("There was a problem while trying to connect. " & vbCrLf & ex.ToString)
Finally. Http.Dispose() End Try. I found the solution. You need to set the HTTPUSERAGENT, HOST, SERVER variables to change the required parts of the WinHTTP request.
I had the code already set a HOST variable but it did not specify the correct value. In the end I used the Proxy server's IP address as a Server variable. I don't know how to get the port so there is no SERVER variable but you can find the port value by using Google.
Dim Request As New WinHttp.WinHttpRequest
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