When dealing with a multipart response the input stream needs to be wrapped
in a #SoupMultipartInputStream and this function or its async counterpart
need to be called to obtain the first part for reading.
After calling this function,
soup.multipart_input_stream.MultipartInputStream.getHeaders can be used to obtain the
headers for the first part. A read of 0 bytes indicates the end of
the part; a new call to this function should be done at that point,
to obtain the next part.
Obtains an input stream for the next part.
When dealing with a multipart response the input stream needs to be wrapped in a #SoupMultipartInputStream and this function or its async counterpart need to be called to obtain the first part for reading.
After calling this function, soup.multipart_input_stream.MultipartInputStream.getHeaders can be used to obtain the headers for the first part. A read of 0 bytes indicates the end of the part; a new call to this function should be done at that point, to obtain the next part.