docs: update config: ref #2800 & #2837

docs/tendermint-core/configuration.md

@@ -68,6 +68,17 @@ filter_peers = false
 # TCP or UNIX socket address for the RPC server to listen on
 laddr = "tcp://0.0.0.0:26657"
 
+# A list of origins a cross-domain request can be executed from
+# Default value '[]' disables cors support
+# Use '["*"]' to allow any origin
+cors_allowed_origins = "[]"
+
+# A list of methods the client is allowed to use with cross-domain requests
+cors_allowed_methods = "[HEAD GET POST]"
+
+# A list of non simple headers the client is allowed to use with cross-domain requests
+cors_allowed_headers = "[Origin Accept Content-Type X-Requested-With X-Server-Time]"
+
 # TCP or UNIX socket address for the gRPC server to listen on
 # NOTE: This server only supports /broadcast_tx_commit
 grpc_laddr = ""