How to do Proxy Authentication

Question

Plz reply..

Thanks

How to make Proxy authentication in MFC. I use InternetSetOption method for it.But still i get ERROR_INTERNET_CONNOT_CONNECT.

in this i does not want to prompt the dialog box to take username and pwd , i do it hardcode,But i dosenot want to do this bcz every client have diff user name and pwd.What is possibility to tackle this.

Is any example for

Basic authentication scheme, where the user name and password are sent in cleartext to the server.

Challenge-response schemes, which allow for a challenge-response format.

Thanks..

I am use this code , Using this code GET method will work fine but POST didnot..

HINTERNET hOpenHandle,  hConnectHandle, hResourceHandle;
DWORD dwError, dwErrorCode;

hOpenHandle = InternetOpen("Example", 
                           INTERNET_OPEN_TYPE_PRECONFIG, 
                           NULL, NULL, 0);

hConnectHandle = InternetConnect(hOpenHandle,
                                 "www.server.com", 
                                 INTERNET_INVALID_PORT_NUMBER, ..why this Invalid port is used
                                 NULL,
                                 NULL, 
                                 INTERNET_SERVICE_HTTP,
                                 0,0);

hResourceHandle = HttpOpenRequest(hConnectHandle, "GET",
                                  "/premium/default.htm",
                                  NULL, NULL, NULL, 
                                  INTERNET_FLAG_KEEP_CONNECTION, 0);

resend:

HttpSendRequest(hResourceHandle, NULL, 0, NULL, 0);

// dwErrorCode stores the error code associated with the call to
// HttpSendRequest.  

dwErrorCode = hResourceHandle ? ERROR_SUCCESS : GetLastError();

dwError = InternetErrorDlg(hwnd, hResourceHandle, dwErrorCode, 
                           FLAGS_ERROR_UI_FILTER_FOR_ERRORS | 
                           FLAGS_ERROR_UI_FLAGS_CHANGE_OPTIONS |
                           FLAGS_ERROR_UI_FLAGS_GENERATE_DATA,
                           NULL);

if (dwError == ERROR_INTERNET_FORCE_RETRY)
    goto resend;

// Insert code to read the data from the hResourceHandle
// at this point.

shrikant gurav · Answer

Respescted Sir Your help is very very IMP for me... I am facing problem of Proxy Authatication  I use InternetSetOption method to set UserName ans PWD but i dont want this method to ask user to give your UName & PWD. At same when i use this method (InternetSetOption) POST method failbut GET work fine.I use code given in MSDN. Now i want one solution that user does not require to give his UName & PWD for proxy Authentication.Digital Authentication is some thing Hard to understand. What is exact in my mind: Suppose i give Username and PWD hardcode in Code for all my product.So that no need to ask user for Uname & pwd but all client which r using this produt have same username and pwd.So is write way to do. Code which i wrote: hOpenHandle = InternetOpen(Example INTERNET_OPEN_TYPE_PRECONFIG ProxyAdd NULL 0); hConnectHandle = InternetConnect(hOpenHandle  www.pxlsoft.com  INTERNET_INVALID_PORT_NUMBER //Why this ...I use 443 it is not working. NULLNULL INTERNET_SERVICE_HTTP00); hResourceHandle = HttpOpenRequest(hConnectHandle POST/url/filenameNULL NULL NULL INTERNET_FLAG_KEEP_CONNECTION // i want to use INTERNET_FLAG_SECURE  0); InternetSetOption(hResourceHandle INTERNET_OPTION_PROXY_USERNAME strUsername cchUserLength+1); cchPasswordLength = strlen(strPassword); InternetSetOption(hResourceHandle INTERNET_OPTION_PROXY_PASSWORD strPassword cchPasswordLength+1); Thanks shrikant. shrikant.gurav@pxlsoft.com

Raj Kumar · Answer

Method 1: Modify the Visual Studio 2005 configuration file loadTOCNode(2 'workaround'); If the proxy server uses Windows authentication the Visual Studio 2005 Help system cannot provide Windows credentials to the proxy server. You can modify the Visual Studio 2005 configuration file to work around this issue. When you do this the Visual Studio 2005 Start Page is not affected and this page downloads content correctly. To make Visual Studio 2005 provide Windows credentials to the proxy server either replace the code in the configuration file with the following code or add the code starting with the tag and ending with the tag to the configuration file. Notes • You must insert the correct proxy server address for your network in the following line of code: proxy bypassonlocal=True proxyaddress=http://yourproxy:port#/ • The configuration file has the following file name: Drive :\Program Files\Common Files\Microsoft Shared\Help 8\Dexplore.exe.config • If you use the integrated Help viewer you must add the XML code to the configuration file. The configuration file has the following file name: Drive :\Program Files\Microsoft Visual Studio 8\Common7\IDE\Devenv.exe.config Method 2: Use the integrated Web browser in Visual Studio 2005 loadTOCNode(2 'workaround'); In certain cases the proxy server may use another authentication scheme such as LDAP-based authentication on a UNIX box. However there is no guaranteed way to make the Visual Studio 2005 Help system provide the needed credentials to the proxy server. The Visual Studio 2005 client must be designed to prompt the user for credentials when the proxy server requests credentials. However this prompting mechanism does not exist in Visual Studio 2005. You may be able to work around this issue by using the integrated Web browser in Visual Studio 2005. To do this follow these steps: 1. Start Visual Studio 2005. 2. On the View menu point to Other Windows  and then click Web Browser . An authentication message may appear when the integrated Web browser tries to access a Web site. If you are prompted for authentication credentials go to step 3. 3. Enter a valid username and password. The Visual Studio 2005 Start Page and Visual Studio 2005 online Help may now function correctly.