服务器返回HTTP响应代码：400 [英] Server returned HTTP response code: 400

问题描述

我正在尝试从URL获取InputStream。该URL可以从Firefox打开。它返回一个json，我已经在Firefox中安装了一个用于查看json的插件，所以我可以在那里查看它。

I am trying to get an InputStream from a URL. The URL can be a opened from Firefox. It returns a json and I have installed an addon for viewing json in Firefox so I can view it there.

所以我试图从Java中获取它：

So I tried to get it from Java by:

URL url = new URL(urlString);
URLConnection urlConnection = url.openConnection();
BufferedReader reader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));

但它在urlConnection.getInputStream（）中抛出IOException。

But it is throwing an IOException in urlConnection.getInputStream().

我也尝试过：

HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = url.openStream();

但没有运气。

任何信息很可观。提前致谢。

Any information is appreciable. Thanks in advance.

推荐答案

谢谢大家。这是一个奇怪的问题，但最后我解决了它。

Thank you everybody. This is a weird problem but at last I solved it.

我要求的网址是

http://api.themoviedb.org/2.1/Movie.search/en/json/api_key/a nightmare on elm street 

现在浏览器在内部用％20替换榆树街上的噩梦之间的空格并进行解析。这就是请求的服务器可以响应该请求的原因。但是从Java开始，我没有用％20替换那个空格，所以它变成了Bad Request，来源。

Now browser replaces the spaces between "a nightmare on elm street" by "%20" internally and parses. That is why the requested server can response by that request. But From Java I didn't replaced that spaces by "%20", so it turns into Bad Request, source.

现在它正在运作。

BufferedReader reader = new BufferedReader(new InputStreamReader(((HttpURLConnection) (new URL(urlString)).openConnection()).getInputStream(), Charset.forName("UTF-8")));

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