synapse. Nginx config for sharing the same hostname between Matrix and website. Static well-known inside Nginx config example.

synapse/nginx/site-and-matrix-example.conf

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+# HTTP with HTTPS redirect
+server {
+  listen       80;
+  server_name  www.domain.tld domain.tld;
+  return       301 https://domain.tld$request_uri;
+}
+
+# Main domain
+server {
+  listen 443 ssl http2;
+
+  # Matrix server
+  # For the federation port
+  listen 8448 ssl default_server;
+  listen [::]:8448 ssl default_server;
+
+  server_name domain.tld;
+
+  access_log /var/log/nginx/domain.tld.access;
+  error_log /var/log/nginx/domain.tld.error;
+
+  # Certificate config
+  include ssl/domain.tld.conf;
+
+  # ========= Web-site section =========
+
+  # Site files directory
+  root /var/www/domain.tld/web;
+
+  charset utf-8;
+
+  include config/wordpress.conf;
+  #include config/static_max_cache.conf;
+  #include config/gzip.conf;
+
+  # ========= Matrix server section =========
+
+  # Sliding Sync Proxy
+  location ~ ^/(client/|_matrix/client/unstable/org.matrix.msc3575/sync) {
+    proxy_pass http://localhost:8889;
+    proxy_set_header X-Forwarded-For $remote_addr;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    proxy_set_header Host $host;
+  }
+
+  # Synapse
+  # https://github.com/matrix-org/sliding-sync?tab=readme-ov-file#same-hostname
+  location ~ ^(\/_matrix|\/_synapse\/client) {
+    proxy_set_header X-Forwarded-For $remote_addr;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    proxy_set_header Host $host;
+
+    # Nginx by default only allows file uploads up to 1M in size
+    # Increase client_max_body_size to match max_upload_size defined in homeserver.yaml
+    client_max_body_size 50M;
+
+    proxy_pass http://localhost:8008;
+  }
+
+  # Matrix WKD
+  # Client
+  location /.well-known/matrix/client {
+    add_header Content-Type application/json;
+    return 200 '{"m.homeserver": {"base_url":"https://domain.tld/"}, "org.matrix.msc3575.proxy": {"url": "https://domain.tld"}}';
+  }
+
+  # Server
+  # https://matrix-org.github.io/synapse/latest/delegate.html#well-known-delegation
+  # https://spec.matrix.org/latest/server-server-api/#server-discovery
+  location /.well-known/matrix/server {
+    add_header Content-Type application/json;
+    return 200 '{"m.server": "domain.tld:8448"}';
+  }
+}