public VirtualHostBuilder baseContextPath(String baseContextPath) {
        this.baseContextPath = RouteUtil.ensureAbsolutePath(baseContextPath, "baseContextPath");
        return this;
    }
Sets the base context path for this {@link VirtualHost}.
Services and decorators added to this {@link VirtualHost} will
be prefixed by the specified {@code baseContextPath}.
core/src/main/java/com/linecorp/armeria/server/VirtualHostBuilder.java