Have a look at this stanza in homeserver.yaml :

"# The absolute URL to the web client which /_matrix/client will redirect

to if 'webclient' is configured under the 'listeners' configuration.

This option can be also set to the filesystem path to the web client

which will be served at /_matrix/client/ if 'webclient' is configured

under the 'listeners' configuration, however this is a security risk:

https://github.com/matrix-org/synapse#security-note

#web_client_location: https://riot.example.com/
"

It refers to the client......... that is the point where my brain falis to compute.

In reply to @dalek:matrix.org
I gave it all a quick read through before i actually start my installation...
In reality, I already have Synaps installed but broken, so I need to follow your guide and make sure my installation is 'aligned' on it as regards the important points....

I think i could indeed make some helpful contributions here.....

For a start. "After the Synapse installation, we will configure it to run under the local IP address" ......... Well, in reality, most people don't have any use for running Synapse as a local instance...... What they want to do, is to put it on the Web, on a real IP address,.

In my own case, I have it on a server that has half a dozen IP addresses, so the 'default server' configuration of Nginx does not help me..... I need the configuration tailored for one particular IP address