SetRequestMethod fails on XULRunner 9.0.1

Hi All,

I am using XULRunner 9.0.1 and having one sample application that will send the "POST" data to the server but while setting the post parameter below is the code.

ns_smartptr postStream(nsCreateInstance("@mozilla.org/io/string-input-stream;1"));

postStream->SetData(<post_data>, <post_data_length>);

nsIUploadChannel *uploadChannel; ((nsIHttpChannel *)channel)->QueryInterface(NS_GET_IID(nsIUploadChannel), (void **)&uploadChannel);

uploadChannel->SetUploadStream(postStream, NS_LITERAL_CSTRING("application/x-www-form-urlencoded"), -1);

nsresult ww = ((nsIHttpChannel *)channel)->SetRequestMethod(NS_LITERAL_CSTRING("POST"));

After setting the "SetUploadStream" It required to set "POST" method again because it is reseting the method to "PUT".

In above code "SetRequestMethod" API is getting failed and giving error NS_ERROR_NOT_AVAILABLE (0x80040111).

Can anyone tell what is wrong with this ?