public SELF pathPrefix(String prefix) {
        pathBuilders.add(Route.builder().pathPrefix(requireNonNull(prefix, "prefix")));
        return self();
    }
Sets the specified prefix which is a directory that an {@link HttpService} will be bound under.
{@code pathPrefix("/my/path")} is identical to {@code path("prefix:/my/path")}.

@throws IllegalArgumentException if the specified path pattern is invalid
core/src/main/java/com/linecorp/armeria/server/AbstractBindingBuilder.java