Problem with WinHttpSendRequest

Are you sure about the 6th parameter? IMO that one should be 'bstrHeaders.length() + m_requestBody.GetSize()', since the docs for 'WinHttpSendRequest()' (http://msdn.microsoft.com/en-us/library/aa384110(VS.85).aspx) describe that as

"dwTotalLength [in]
An unsigned long integer value that contains the length, in bytes, of the total data sent. This parameter specifies the Content-Length header of the request."

No.  RFC 2068 says that Content-Length is the length of the message-body, i.e., all data following the headers.  The 5th and 6th parameters should be the same.

Did you remember to specify the byte length (not the character length) for parameters 5 and 6?   Parameter 2 is measured in characters but parameters 5 and 6 are measured in bytes.

Your Content-Type is utf-8.  Did you remember to first encode m_requestBody in UTF-8?
 
You need to systematically modify your program to determine which parameter is bad.  First try WinHttpSendRequest(GetHandle(), WINHTTP_NO_ADDITIONAL_HEADERS, 0, WINHTTP_NO_REQUEST_DATA, 0, 0, 0).  If that works, then add the headers.  If that works, then add the request body.  Keep adding parameters until you find the bad one.

Good luck!

Thanks.

For header information i am using _bstr_t and for length i m calling its .length method. So it will always be in characters. For post request body i am using byte buffer which i populated from file reading. So its length i am passing as bytes length.

One concern as u mentioned, how can i encode the files (say some image file)  binary data to UTF8 data.
Can u plz help me here.

Use WideCharToMultiByte(CP_UTF8,...)

Binary data should not be encoded in UTF8.  There are some codepoints in UCS that are invalid (such as U+FFFF) and won't encode property in UTF8.

Since you are transferring binary data you can use a neutral character set such as "Windows-1252".   In this case don't call WideCharToMultiByte;  simply transmit the message body as-is.

I am reading the image file in byte array and assigning it to m_requestBody. And i am directly passing it as parameter in WinHttpSendRequest API. It means no need to change anything there?

Moreover i tried all the options as u mentioned previously. I tried to pass total length as header + content. And as well as only content length as 2nd last param. But nothing worked.

I also tried WinHttpSendRequest(GetHandle(), WINHTTP_NO_ADDITIONAL_HEADERS, 0, WINHTTP_NO_REQUEST_DATA, 0, 0, 0) and passing params in stages. But it failed when i post that file which is having chinese name.

I also tried to add content+length and transfer encoding in header but it also didnt work.

Try renaming the file?

Yes as i told previosuly if i rename the file to english name then it works fine.

But i am using "POST" verb for posting the image file to the web server using HTTP.
And i am passing additional header which u can see in my posted question and the file's binary data as parameters. Moreover while opening the HTTP request i m calling OpenRequest(strVerb, strUrl); method. Where i am passing "POST" as first param and URL of web server as 2nd param. I am not passing any file name here.

Additional header:
Slug: glº.3gp
Authorization: WSSE profile="UsernameToken"
X-WSSE: UsernameToken Username="ik_test", PasswordDigest="d4koksdiAAHQAxUg+9A5MJhBkIY=", Nonce="KJHYTG9tLLP09TYxODE4ZmNiMWNjNjMzMWY4DjBmZjksNTzssss3w", Created="2009-07-30T05:56:16Z"
Content-Type: video/3gp; charset=utf-8

As u can see if Slag tag contians chinese characer then WinHttpSendRequest returns invalid parameter error. Otherwise it works for all files. If u will see chinese character are only present in the header at one place only nowhere else. If i just rename the same file to english characters then it posted successfully.

Do u mean to say that i should do some kind of encoding in the header part?