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POST method don't work, need example

I can't get the function CHttpFile::SendRequest to work
as I use the post method. The webserver is IIS 4.0.

I'm requesting an ASP and I get a CInternetException:
no 87, "Invalid parameter" (or something like that, I use
swedish so I get the message in swedish).

Do you have any working example code using post method
in CHttpFile?
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1 Solution
Here is some code I use to read from an ASP page:

int CJeffsHttpConnection::ConnectToURLandRead(CString url, CString *buffer)
      int rval = TRUE;

      DWORD dwHttpRequestFlags =
      const TCHAR szHeaders[] = _T("Accept: text/*\r\nUser-Agent: Your Appliction\r\n");

      CString strServerName;
      CString strObject;
      INTERNET_PORT nPort;
      DWORD dwServiceType;

      if (!AfxParseURL(url, dwServiceType, strServerName, strObject, nPort) ||
            dwServiceType != INTERNET_SERVICE_HTTP)
            cerr << _T("Error: can only use URLs beginning with http://") << endl;

      CInternetSession inetSession;
      CHttpConnection* pHttpConection = inetSession.GetHttpConnection( (LPCTSTR) strServerName);
      CHttpFile* pHttpFile = pHttpConection->OpenRequest(CHttpConnection::HTTP_VERB_POST,
                  strObject, NULL, 1, NULL, NULL, dwHttpRequestFlags);
snilssonAuthor Commented:

The example given of NotJeff is not an POST example,
it's just a modified GET example. He doesn't supply
any parameters (like "name=joe&userid=xx") and nothing
works in his example.
I can send a POST request to the websever but it doesn't recognize the parameters.
Odds are that you're not including the right headers with your request. Most ASP components are set up to expect a form when they receive a POST. As such, you should make sure the request you're sending is actually _sending_ a form.

You should be sending the header "Content-Type: application/x-www-form-urlencoded" with your request so the server (and the ASP processor) know you're sending along the encoded content of a form.

B ekiM

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snilssonAuthor Commented:
I am sorry mikeblas, but I have tried those headers
and it doesn't work.

IIS 4.0 just don't recognize the parameters, it's acting
like no parameters were sent, and my Request-object on the
ASP contains nothing.

This is not easy!!

snilssonAuthor Commented:
The IIS doesn't recognize the parameters I send
in my POST statement. The Request-object on the ASP
contains nothing.
Does the ASP work from a web browser?  If so, a very direct way to solve your problem is to use the browser to work the ASP while monitoring the communication with a network sniffer. You can see the exact request sent by the browser, and then replicate that request using WININET calls.

If you don't have access to a network sniffer, write a small ISAPI filter that logs the raw request text to a file.

B ekiM
My code works.  I use it in a real world released application.   On top of that I use IIS 4.0  and ASP pages to read all the application sent.  So yes the code does work.  i.e. I send
a url:  "http://www.mydomain.com/asps/validateuser.asp?Username=joe&Passcode=blow"

<% localUsername = Request.QueryString("Username") %>
<% localPasscode = Request.QueryString("Passcode") %>

fp_sQry = "select * from UserListTable where  User_ID='" + cstr(localUsername) + "'"

I agree with mikeblas.  You should first make a form
and make sure you can do it with a form on a web page.
Also please see the following code on the difference between getting variables from a form and from a URL on an ASP page

<p>Name entered via form is: <%= Request.Form("Username") %> </p>
<p>Name entered via url is: <%= Request.QueryString("Username") %> </p>
snilssonAuthor Commented:

I don't know what made my program work actually, but now
it's working. From the begining I couldn't use my webbrowser
to post to my ASP as well as my MFC-appl.
I did some changes in my program but no one of the suggested
but somehow it works now.

Mikeblas: Thank you for your help and comments.

NotJeff: Your last comment shows the use of the Querystring of
the Request-object. Your also supply "http://www.mydomain.com/asps/validateuser.asp?Username=joe&Passcode=blow", and isn't that how GET is done?
Anyway I'm sorry I questioned your code so hard in the first place - I just had a bad day. Thank you too.

How can I give anyone any points now for the help?
No one directly helped me but Mikeblas or NotJeff is worth
Hell I could use the points and this needs to be closed out!
snilssonAuthor Commented:
OK, NotJeff gets some easy points...
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