String recv(NetHandle h, Int maxlen=-1, Int timeout=0)
h: The connection
maxlen: The maximum number of bytes to read (or unlimited, if negative). For TLS connections, this is always unlimited. Note that if the data to be received contains multi-byte characters, care must be taken to avoid ending receiving part-way through a multi-byte character.
timeout: The number of seconds to wait without input before timing out. The default is zero. For TLS connections, this parameter is ignored.
Reads up to maxlen bytes from the connection, and times out after timeout seconds.