httpclient 4 header问题

Question

PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
            cm.setMaxTotal(MAX_CONNECTIONS);
            cm.setDefaultMaxPerRoute(MAX_CONNECTIONS);
            httpClient = HttpClients.custom()
                    .setConnectionManager(cm)
                    .setDefaultHeaders(defaultHeader())
                    .build();

    private List<Header> defaultHeader() {
        ArrayList<Header> headers = new ArrayList<Header>();
        Header header = new BasicHeader(HttpHeaders.USER_AGENT, UserAgent);
        headers.add(header);
        if (!StringUtils.isEmpty(referer)) {
            headers.add(new BasicHeader(HttpHeaders.REFERER, referer));
        }
        if (!StringUtils.isEmpty(cookie)) {
            headers.add(new BasicHeader("Cookie", cookie));
        }
        return headers;
    }

返回的数据 

 [HTTP_CONNECTION] => Keep-Alive

 [HTTP_USER_AGENT] => Apache-HttpClient/4.3.3 (java 1.5)

怎么header 中的 USER_AGENT 还是默认的呢?

如果在这里设置header 就没问题

HttpGet request = new HttpGet(url);
request.addHeader(HttpHeaders.USER_AGENT, UserAgent);

Answer 1

不行 返回还是 [HTTP_CONNECTION] => Keep-Alive [HTTP_USER_AGENT] => Apache-HttpClient/4.3.3 (java 1.5)

Answer 2

HttpClientBuilder httpClientBuilder =
                HttpClientBuilder.create()
                        .setUserAgent("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.114 Safari/537.36");
        //httpclient = HttpClients.createDefault();
        httpclient = httpClientBuilder.build();