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|
=encoding utf-8
=head1 Name
stream_processing - How nginx processes a TCP/UDP session
=head1
A TCPE<sol>UDP session from a client is processed
in successive steps called B<phases>:
=over
=item
C<Post-accept>
The first phase after accepting a client connection.
The L<ngx_stream_realip_module|ngx_stream_realip_module>
module is invoked at this phase.
=item
C<Pre-access>
Preliminary check for access.
The
L<ngx_stream_limit_conn_module|ngx_stream_limit_conn_module>
and
L<ngx_stream_set_module|ngx_stream_set_module>
modules are invoked at this phase.
=item
C<Access>
Client access limitation before actual data processing.
At this phase,
the L<ngx_stream_access_module|ngx_stream_access_module>
module is invoked,
for L<njs|index>,
the L<ngx_stream_js_module> directive
is invoked.
=item
C<SSL>
TLSE<sol>SSL termination.
The L<ngx_stream_ssl_module|ngx_stream_ssl_module>
module is invoked at this phase.
=item
C<Preread>
Reading initial bytes of data into the
L<preread buffer|ngx_stream_core_module>
to allow modules such as
L<ngx_stream_ssl_preread_module|ngx_stream_ssl_preread_module>
analyze the data before its processing.
For L<njs|index>,
the L<ngx_stream_js_module> directive
is invoked at this phase.
=item
C<Content>
Mandatory phase where data is actually processed, usually
L<proxied|ngx_stream_proxy_module> to
L<upstream|ngx_stream_upstream_module> servers,
or a specified value
is L<returned|ngx_stream_return_module> to a client.
For L<njs|index>,
the L<ngx_stream_js_module> directive
is invoked at this phase.
=item
C<Log>
The final phase
where the result of a client session processing is recorded.
The L<ngx_stream_log_module|ngx_stream_log_module>
module is invoked at this phase.
=back
|
