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> SSL_write() will only return with success, when the complete contents
> of B<buf> of length B<num> has been written. This default behaviour
> can be changed with the SSL_MODE_ENABLE_PARTIAL_WRITE option of
> L<SSL_CTX_set_mode(3)|SSL_CTX_set_mode(3)>. When this flag is set,
> SSL_write() will also return with success, when a partial write has been
> successfully completed. In this case the SSL_write() operation is considered
> completed. The bytes are sent and a new SSL_write() operation with a new
> buffer (with the already sent bytes removed) must be started.
> A partial write is performed with the size of a message block, which is
> 16kB for SSLv3/TLSv1.
>