client.execute()执行超时后也没有返回值,偶发

Question

问题遇到的现象和发生背景

client.execute(method, context)执行超时后也没有返回值,入参打印后等超时时间(6秒)后下面的日志也没打印,方法最后返回了null

问题相关代码，请勿粘贴截图

public static String httpRequestToString(String url, String requestMethod,
        Map<String, String> params, String lx,String ...auth){
    //接口返回结果
    String methodResult = null;
    try {
        String parameters = "";
        boolean hasParams = false;
        //将参数集合拼接成特定格式，如name=zhangsan&age=24
        for(String key : params.keySet()){
            String value = URLEncoder.encode(params.get(key), "UTF-8");
            parameters += key +"="+ value +"&";
            hasParams = true;
        }
        if(hasParams){
            parameters = parameters.substring(0, parameters.length()-1);
        }
        //是否为GET方式请求
        boolean isGet = "get".equalsIgnoreCase(requestMethod);
        boolean isPost = "post".equalsIgnoreCase(requestMethod);
        boolean isPut = "put".equalsIgnoreCase(requestMethod);
        boolean isDelete = "delete".equalsIgnoreCase(requestMethod);

        //创建HttpClient连接对象
        DefaultHttpClient client = new DefaultHttpClient();
        HttpRequestBase method = null;
        if(isGet){
            url += "?" + parameters;
            method = new HttpGet(url);
        }else if(isPost){
            method = new HttpPost(url);
            HttpPost postMethod = (HttpPost) method;
            StringEntity entity = new StringEntity(parameters);
            postMethod.setEntity(entity);
        }else if(isPut){
            method = new HttpPut(url);
            HttpPut putMethod = (HttpPut) method;
            StringEntity entity = new StringEntity(parameters);
            putMethod.setEntity(entity);
        }else if(isDelete){
            url += "?" + parameters;
            method = new HttpDelete(url);
        }
        method.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 6000);
        //设置参数内容类型
        method.addHeader("Content-Type",lx);
        //httpClient本地上下文
        HttpClientContext context = null;
        if(!(auth==null || auth.length==0)){
            String username = auth[0];
            String password = auth[1];
            UsernamePasswordCredentials credt = new UsernamePasswordCredentials(username,password);
            //凭据提供器
            CredentialsProvider provider = new BasicCredentialsProvider();
            //凭据的匹配范围
            provider.setCredentials(AuthScope.ANY, credt);
            context = HttpClientContext.create();
            context.setCredentialsProvider(provider);
        }
        //访问接口，返回状态码
        log.info("client执行入参method:{},context:{},",method,context);
        HttpResponse response = client.execute(method, context);
        log.info("client执行的返参{},",response);
        //返回状态码200，则访问接口成功
        if(response.getStatusLine().getStatusCode()==200){
            methodResult = EntityUtils.toString(response.getEntity());
        }
        client.close();
    }catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }catch (IOException e) {
        e.printStackTrace();
    }
    return methodResult;
}

运行结果及报错内容

方法最后返null,请求后的日志也没打印,偶发的,

我的解答思路和尝试过的方法

我想要达到的结果