java - apache httpclient 内容长度问题

Question

我正在尝试使用 Apache Httpclient 将一些 JSON 发布到休息服务。但是，我收到此错误:

    Exception in thread "main" org.apache.http.ProtocolException: Content-Length header already present

---

UsernamePasswordCredentials defaultcreds = new UsernamePasswordCredentials(USER,
            PASS);


    HttpHost targetHost = new HttpHost("localhost", 8080, "http");

    DefaultHttpClient httpclient = new DefaultHttpClient();

    httpclient.getCredentialsProvider().setCredentials(
            new AuthScope(targetHost.getHostName(), targetHost.getPort()),
            new UsernamePasswordCredentials(USER, PASS));


    HttpPost httpPost = new HttpPost(urlSuffix) {};

    JSONObject holder = new JSONObject();
    holder.put("name", "this is a folder");


    StringEntity se = new StringEntity(holder.toString());

    httpPost.setHeader("Accept", "application/json");
    httpPost.setHeader("Content-type", "application/json");
    httpPost.setEntity(se);



    HttpResponse resp = httpclient.execute(targetHost,httpPost);

    System.out.println("Resp->" + resp.getStatusLine().getStatusCode());

---

我已经阅读了它，因为我已经设置了两次内容长度，但我不确定如何修复它。

Answer 1

我意识到自从有人提出这个问题以来已经有一段时间了，但这是我找到的解决方案:如果您无法更改客户端 jar，我使用的解决方法是:

httpClient.removeRequestInterceptorByClass(org.apache.http.protocol.RequestContent.class);

Apache的http客户端有一个请求拦截器，自动计算并添加content length header，这也是ws库完成的。使用上面的代码，这个拦截器被排除在请求处理之外。