Set the request body of a #SoupMessage.
If content_type is null and stream is not null the Content-Type header will not be changed if present. The request body needs to be set again in case msg is restarted (in case of redirection or authentication).
MIME Content-Type of the body, or null if unknown
a #GInputStream to read the request body from
the byte length of stream or -1 if unknown
Set the request body of a #SoupMessage.
If content_type is null and stream is not null the Content-Type header will not be changed if present. The request body needs to be set again in case msg is restarted (in case of redirection or authentication).