[网络协议]The HTTP header line [http Method: POST] does not conform to RFC 7230 and has been ignored

今天遇到一个比较基础，又没遇到过的问题。

这是使用httpClient调用接口的时候报的错误，错误就是http的请求头不正确。但是调用接口的是共用方法，以前都是正常用的，怎么这次就不行了呢？换了一个请求方法就好了。

话不多说，直接看解决方案。两个post请求的方法，总有一个是适合你的。根据自己项目的选择的httpClient版本进行选择不同的方法。

方法一：

public static String doPostJson(String url, String json,String token_header) throws Exception {
    // 创建Httpclient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    CloseableHttpResponse response = null;
    String resultString = "";
    try {
        // 创建Http Post请求
        HttpPost httpPost = new HttpPost(url);
        // 创建请求内容
        httpPost.setHeader("HTTP Method","POST");
        httpPost.setHeader("Connection","Keep-Alive");
        httpPost.setHeader("Content-Type","application/json;charset=utf-8");
        httpPost.setHeader("x-authentication-token",token_header);
        StringEntity entity = new StringEntity(json);
        entity.setContentType("application/json;charset=utf-8");
        httpPost.setEntity(entity);
        // 执行http请求
        response = httpClient.execute(httpPost);
        if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
            resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
        }
    } catch (Exception e) {
        throw e;
    } finally {
        try {
            if(response!=null){
                response.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return resultString;
}

方法二：

public static String doPostForBooking(String urles, String json) throws Exception {
    HttpURLConnection connection = null;
    BufferedReader br = null;
    InputStream inputStream = null;
    // 存放数据
    StringBuffer sbf = new StringBuffer();
    try {
        // 创建远程url连接对象
        URL url = new URL(urles);
        // 通过远程url连接对象打开一个连接，强转成httpURLConnection类
        connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("POST");
        // 允许写出
        connection.setDoOutput(true);
        // 允许读入
        connection.setDoInput(true);
        // 不使用缓存
        connection.setUseCaches(false);
        // 设置参数类型是json格式
        connection.setRequestProperty("Content-Type", "application/json;charset=utf-8");
        connection.connect();
        String body = json;
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(connection.getOutputStream(), "utf-8"));
        writer.write(body);
        writer.close();
        // 通过connection连接，获取输入流
        int responseCode = connection.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            inputStream = connection.getInputStream();
            // 将输入流转换为字符串
            // 封装输入流is，并指定字符集
            br = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
            String temp = null;
            while ((temp = br.readLine()) != null) {
                sbf.append(temp);
                sbf.append("\r\n");
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (null != br) {
            try {
                br.close();
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        if (null != inputStream) {
            try {
                inputStream.close();
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        // 关闭远程连接
        connection.disconnect();
    }
    return sbf.toString().replaceAll("(\r\n|\n)", "");
}