public Message crawl_an_url(String url) throws IOException {
        /*Funcao para fazer crawl a um URL pedido*/
        Message response_message;
        boolean partial_success = false;
        LinkedList<Pair<String, Integer>> ll = new LinkedList<>();
        ll.add(new Pair<>(url, 0));
        String token;
        HashSet<String> set;
        String current_url;
        Pair<String, Integer> p;
        int depth;
        while (ll.size()>0) {
            p = ll.removeFirst();
            current_url = p.getKey();
            depth = p.getValue();
            try {
                Document doc = Jsoup.connect(current_url).timeout(10000).execute().parse();
                StringTokenizer tokens = new StringTokenizer(doc.text());
                int countTokens = 0;
                while (tokens.hasMoreElements() && countTokens++ < 200) {
                    token = tokens.nextToken().toLowerCase();
                    if (this.word_index.containsKey(token)) {
                        set = this.word_index.get(token);
                    } else {
                        set = new HashSet<>();
                        this.word_index.put(token, set);
                    }
                    set.add(current_url);
                }
                Elements links = doc.select("a[href]");
                for (Element link : links) {
                    String new_url = link.attr("abs:href");
                    if (this.url_index.containsKey(new_url)) {
                        set = this.url_index.get(new_url);
                    } else {
                        set = new HashSet<>();
                        this.url_index.put(new_url, set);
                    }
                    set.add(current_url);
                    if (depth < 1) ll.add(new Pair<>(new_url, depth + 1));
                }
            } catch (IllegalArgumentException e){
                if(current_url.equals(url)){
                    response_message = new Message("type|index_status;successful|no;msg|Given url isn't valid");
                    return response_message;
                }else{
                    partial_success = true;
                }
            } catch (IOException e) {
                partial_success = true;
            }
        }
        write_to_file(this.word_index, f_word_index);
        write_to_file(this.url_index, f_url_index);
        if(partial_success){
            response_message = new Message("type|index_status;successful|partial;msg|Given url is valid but one or more url found in iteration is not");
        }else{
            response_message = new Message("type|index_status;successful|yes;msg|Given url is valid and was indexed");
        }
        return response_message;
    }