SAMPLE: Vbhttp.exe Demonstrates How to Use HTTP WinInet APIs in Visual Basic

The Vbhttp.exe file is a sample that demonstrates how to use Win32 Internet (WinInet) HTTP application programming interfaces (APIs) in Visual Basic.

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Vbhttp.exe contains the following files:



The sample demonstrates the following concepts:

• How to use the GET/POST method to send an HTTP/HTTPS request and how to read the response from the server.
  
  This sample uses the same proxy setting in Internet Explorer by passing INTERNET_OPEN_TYPE_PRECONFIG to the InternetOpen function.
• How to handle proxy/Web server authentication.
  
  This sample calls InternetSetOption (no UI) to set the credential after it detects the 407 (proxy server) or 401 (Web server) status code. To display the built-in logon dialog box in Internet Explorer, call the InternetErrorDlg function instead. For Web server authentication, you can directly pass the user name and password to the InternetConnect function, if you already have them.
• How to handle invalid certificate authority error (12045).
  
  This sample uses InternetSetOption (no UI) to ignore the error after HttpSendRequest fails. You can use the InternetErrorDlg function (with UI) as well.

For a list of all WinInet APIs, see the following MSDN Web Workshop site (click Win32 Internet Functions in the left frame): For additional information, click the article numbers below to view the articles in the Microsoft Knowledge Base: