Obtains an input stream for the next part.
When dealing with a multipart response the input stream needs to be wrapped in a MultipartInputStream and this function or its async counterpart need to be called to obtain the first part for reading.
After calling this function, [[email protected]_headers] 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.
| this | |
| cancellable |
a Cancellable |
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a new InputStream, or null if there are no more parts |