increase matrix request-uri max size

config/hosts/matrix/nginx.nix

@@ -92,6 +92,8 @@
         # Then tell the realip_module to get the addreses from the proxy protocol
         # header.
         real_ip_header proxy_protocol;
+        # increase header buffer size because mjolnir sometimes uses very large URIs which nginx would normally block
+        large_client_header_buffers 4 16k;
       '';
     };