Creates a new Message and sets it up to send multipart to uri via
POST.
To send a "multipart/form-data" POST, first create a Multipart, using FORM_MIME_TYPE_MULTIPART as the MIME type. Then use append_form_string and append_form_file to add the value of each form control to the multipart. (These are just convenience methods, and you can use append_part if you need greater control over the part headers.) Finally, call request_new_from_multipart to serialize the multipart structure and create a Message.
| uri |
the URI to send the form data to |
| multipart |
a "multipart/form-data" Multipart |
|
the new Message |