It is documented in the Streaming Replication Protocol section, but was
missing from the list of options in StartupMessage description.
+
+
+ replication>
+
+
+ Used to connect in streaming replication mode, where a small
+ set of replication commands can be issued instead of SQL
+ statements. Value can be true>,
+ false>, or database>, and the default
+ is false>. See
+ for details.
+
+
+
In addition to the above, any run-time parameter that can be