Emitted after receiving the Status-Line and response headers.
See also [[email protected]_header_handler] and [[email protected]_status_code_handler], which can be used to connect to a subset of emissions of this signal.
If you cancel or requeue msg while processing this signal, then the current HTTP I/O will be stopped after this signal
emission finished, and msg's connection will be closed. (If you need to requeue a message--eg, after handling authentication
or redirection--it is usually better to requeue it from a [signal@Message:SoupMessage:got-body] handler rather than a [
signal@Message:SoupMessage:got_headerss] handler, so that the existing HTTP connection can be reused.)