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By default, have libpq set the TLS extension "Server Name Indication" (SNI). This allows an SNI-aware SSL proxy to route connections. (This requires a proxy that is aware of the PostgreSQL protocol, not just any SSL proxy.) In the future, this could also allow the server to use different SSL certificates for different host specifications. (That would require new server functionality. This would be the client-side functionality for that.) Since SNI makes the host name appear in cleartext in the network traffic, this might be undesirable in some cases. Therefore, also add a libpq connection option "sslsni" to turn it off. Discussion: https://www.postgresql.org/message-id/flat/7289d5eb-62a5-a732-c3b9-438cee2cb709%40enterprisedb.com
The PostgreSQL contrib tree
---------------------------
This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree. This does not preclude their
usefulness.
User documentation for each module appears in the main SGML
documentation.
When building from the source distribution, these modules are not
built automatically, unless you build the "world" target. You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.
Some directories supply new user-defined functions, operators, or
types. To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command. In a fresh database,
you can simply do
CREATE EXTENSION module_name;
See the PostgreSQL documentation for more information about this
procedure.