android - URL 验证工作正常但保持连接并限制任何进一步的请求

Question

public class UrlVarificationTask extends AsyncTask<Void, Void, Integer> {

    private String url;
    private UrlVarificationDelegate delegate;
    private HttpURLConnection huc;

    public UrlVarificationTask(String url, UrlVarificationDelegate delegate) {
        this.url = url;
        this.delegate = delegate;
    }

    @Override
    protected void onPreExecute() {

        super.onPreExecute();
    }

    @Override
    protected Integer doInBackground(Void... params) {
        int responseCode = 0;
        try {
            System.setProperty("http.keepAlive", "false");
            URL u = new URL(url);
            huc = (HttpURLConnection) u.openConnection();
            huc.setRequestMethod("HEAD");
            huc.connect();
            responseCode = huc.getResponseCode();

        } catch (MalformedURLException mal) {
            responseCode = -555;
        } catch (IOException io) {
            responseCode = -444;
        } catch (Exception ex) {
            responseCode = -333;
            ex.printStackTrace();
        }

        if (huc != null) {
            try {
                huc.getInputStream().close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            huc.disconnect();
        }

        Logger.debug("Response Code==" + responseCode);
        return responseCode;
    }

    @Override
    protected void onPostExecute(Integer responseCode) {
        delegate.urlVarificationResponseCode(responseCode);
        super.onPostExecute(responseCode);
    }

}

我使用上面的 dode 来验证 url，

如果 HEAD 给我响应代码 200，那么只有我打开一个 url 到 webview。

但是一旦我调用它，它就会保持连接并且即使在关闭后也不允许任何其他 http 请求，该怎么办？

Safe use of HttpURLConnection

Answer 1

huc.setRequestProperty("keep-alive", "false");

这是因为 HttpURLConnection 保持连接有效，因此我们无法发出进一步的请求，因此将 keep-alive 设置为 false 可以解决此问题。