Http Client Protocol Issues (and other fun stuff I support)

Because of RFC 2616 section 8.1.4 ( http://www.w3.org/Protocols/rfc2616/rfc2616-sec8.html ) we have traditionally limited the number of persistent connections to 2 per server. This is because of the strong language in this RFC: " A single-user client...

I came across this problem. The key to this was that the documents opened fine when clicking on them, so I knew the Office installation itself was fine. Some rogue application on install or removal had apparently removed the appropriate Content Type registry...

This took me a couple of minutes to find so I thought I would share this here. I downloaded ProcMon (process monitor) and could view the help file. It would open but the right pane had a message: "Navigation to the webpage was canceled" The left pane...

I like to build and run with UAC on. When running the HttpCalculatorService example I got this error: Failure: errorCode=0x80070005 Unable to add URL to HTTP URL group. Access is denied. Running from an administrator command prompt I do not get the...

These options are well documented. Important notes: These flags affect the process that you set this option from. You do not need to pass an InternetHandle (but no error if you do). Sample code: bool abRes = false ; DWORD adOption = INTERNET_SUPPRESS_COOKIE_PERSIST;...

The documentation on this is very straight forward ( http://msdn.microsoft.com/en-us/library/aa385328(VS.85).aspx ). At the time of publishing however the documentation has a slight error. You cannot pass a handle in for the first argument. It must be...

With the release of Internet Explorer 8 comes a new option you can query for with programming with the WinInet APIs: INTERNET_OPTION_SERVER_CERT_CHAIN_CONTEXT. The MSDN documentation tells you it allows you to get the PCCERT_CHAIN_CONTEXT , and not much...

There are a couple of new Cookie flags introduced with the Internet Explorer 8 WinInet.dll. The INTERNET_COOKIE_HTTPONLY flag allows you to read the HttpOnly cookies in your WinInet Code. This flag is documented here: http://msdn.microsoft.com/en-us/library...

With the release of Internet Explorer 8 comes a new option for WinInet programming: INTERNET_OPTION_SUPPRESS_SERVER_AUTH. The MSDN documentation is very specific and describes how the option affects authorization, but I like to see things in action! How...

There can be many reasons for this error. In some cases this error can be confusing. I have seen a few instances where an ASP.Net webservice call resulted in this error. More perplexing is the fact that Internet Explorer on the same machine can reach...