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even more clarification

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Richard van der Hoff 6 years ago
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specification/server_server_api.rst
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@ -71,36 +71,40 @@ This version of the specification is generated from
`matrix-doc <https://github.com/matrix-org/matrix-doc>`_ as of Git commit `matrix-doc <https://github.com/matrix-org/matrix-doc>`_ as of Git commit
`{{git_version}} <https://github.com/matrix-org/matrix-doc/tree/{{git_rev}}>`_. `{{git_version}} <https://github.com/matrix-org/matrix-doc/tree/{{git_rev}}>`_.
Server Discovery Server discovery
---------------- ----------------
Resolving Server Names Resolving server names
~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~
Each matrix homeserver is identified by a server name consisting of a hostname Each matrix homeserver is identified by a server name consisting of a hostname
and an optional port, as described by the `grammar <../appendices.html#server-name>`_. and an optional port, as described by the `grammar
<../appendices.html#server-name>`_. Server names should be resolved to an IP
address and port using the following process:
If the hostname is an IP literal, then that IP address should be used, together * If the hostname is an IP literal, then that IP address should be used,
with the given port number, or 8448 if no port is given. together with the given port number, or 8448 if no port is given.
Otherwise, if the port is present, then an IP address is discovered by looking * Otherwise, if the port is present, then an IP address is discovered by
up an AAAA or A record for the hostname, and the specified port is used. looking up an AAAA or A record for the hostname, and the specified port is
used.
If the hostname is not an IP literal and no port is given, the server is * If the hostname is not an IP literal and no port is given, the server is
discovered by first looking up a ``_matrix._tcp`` SRV record for the hostname, discovered by first looking up a ``_matrix._tcp`` SRV record for the
which may give a hostname (to be looked up using AAAA or A queries) and port. hostname, which may give a hostname (to be looked up using AAAA or A queries)
If the SRV record does not exist, then the server is discovered by looking up and port. If the SRV record does not exist, then the server is discovered by
an AAAA or A record on the hostname and taking the default fallback port number looking up an AAAA or A record on the hostname and taking the default
of 8448. fallback port number of 8448.
Homeservers may use SRV records to load balance requests between multiple TLS Homeservers may use SRV records to load balance requests between multiple TLS
endpoints or to failover to another endpoint if an endpoint fails. endpoints or to failover to another endpoint if an endpoint fails.
When making requests to servers, use the DNS name of the target server in the When making requests to servers, use the hostname of the target server in the
``Host`` header, regardless of the host given in the SRV record. For example, ``Host`` header, regardless of the any hostname given in the SRV record. For
if making a request to ``example.org``, and the SRV record resolves to ``matrix. example, if the server name is ``example.org``, and the SRV record resolves to
example.org``, the ``Host`` header in the request should be ``example.org``. The ``matrix.example.org``, the ``Host`` header in the request should be
port number for target server should not appear in the ``Host`` header. ``example.org``. The port number for target server should **not** appear in the
``Host`` header.
Server implementation Server implementation
~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~

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