来自GAE Java的HTTP GET [英] Http GET from GAE Java

问题描述

好吧，我真的希望我可以在不询问这里的情况下处理这个问题，但我不能：（
）这个想法非常简单，你有这个链接 http://cetatenie.just.ro/ ，该链接很重要，因为它适用于其他人。

你想在GAE上执行一个HTTP GET - 本地现在，就是这样！

如果我在主类中执行它，如下所示：

pre $ HttpClient httpClient = new DefaultHttpClient（）;
HttpGet httpGet = new HttpGet（http://cetatenie.just.ro/ ）;
HttpResponse response = httpClient.execute（httpGet）;


然后解析响应一切都很好，现在我在GAE - 本地（在Eclipse - > Run As - > Web Application）中执行相同的（几乎）操作，并借助于Eclipse GAE插件。

  FetchOptions fetchOptions = FetchOptions.Builder.withDeadline（50000）; 
 HTTPRequest request = new HTTPRequest（new U RL（http://cetatenie.just.ro/），HTTPMethod.GET，fetchOptions）; 
 System.out.println（ULR  - >+ request.getURL（））; 
 URLFetchService服务= URLFetchServiceFactory.getURLFetchService（）; 
 HTTPResponse response = service.fetch（request）; 
 System.out.println（RESPONSE_CODE  - >+ response.getResponseCode（））; 
 String responseAsString = new String（response.getContent（））; 
 System.out.println（RESPONSE_AS_STRING  - >+ responseAsString）; 
  

我总是得到一个Http 500错误代码。我知道这表示服务器存在问题，但是它是如何从我的独立应用程序中运行的？

GAE做了些什么吗？

问候，
尤金。

解决方案

这实际上很简单 - 发送请求时，我缺少两个头（看起来像GAE就像一个telnet - 除非指定它们，否则不会发送任何头文件）。无论如何，这是我补充说：

  URL url = new URL（http://cetatenie.just.ro）; 
 URLConnection urlConnection = url.openConnection（）; 
 urlConnection.setRequestProperty（Host，cetatenie.just.ro）; 
 urlConnection.setRequestProperty（User-Agent，Mozilla / 5.0（X11; Linux i686; rv：7.0.1）Gecko / 20100101 Firefox / 7.0.1）; 
  

Well, I really hoped I could handle this without asking here, but I can't :( The idea is pretty simple, you have this link http://cetatenie.just.ro/ and the link is important, because it works for others.

You want to perform a HTTP GET on it from GAE - locally for now, that's it!

If I do it in main class, something like this :

HttpClient httpClient = new DefaultHttpClient();    
HttpGet httpGet = new HttpGet("http://cetatenie.just.ro/");
HttpResponse response = httpClient.execute(httpGet);

And then parse the response everything is fine, now I do the same (almost) thing in GAE - locally (in Eclipse --> Run As --> Web Application), with the help of the Eclipse GAE plugin.

FetchOptions fetchOptions = FetchOptions.Builder.withDeadline(50000);
HTTPRequest request = new HTTPRequest(new URL("http://cetatenie.just.ro/"), HTTPMethod.GET, fetchOptions);
System.out.println("ULR-->" + request.getURL());    
URLFetchService service = URLFetchServiceFactory.getURLFetchService();
HTTPResponse response = service.fetch(request);
System.out.println("RESPONSE_CODE-->" + response.getResponseCode());
String responseAsString = new String(response.getContent());
System.out.println("RESPONSE_AS_STRING-->" + responseAsString);

I always get a Http 500 error code. I know that this indicates on a server problem, but how come it works from my stand-alone application?

Is GAE doing something fishy?

Regards, Eugene.

解决方案

Damn! This was easy actually - when sending the request I was missing two headers (seems like GAE is like a telnet - not sending any headers unless you specify them). Anyhow here is what I added:

 URL url = new URL("http://cetatenie.just.ro");
 URLConnection urlConnection = url.openConnection();
 urlConnection.setRequestProperty("Host", "cetatenie.just.ro");
 urlConnection.setRequestProperty("User-Agent", "Mozilla/5.0 (X11; Linux i686; rv:7.0.1) Gecko/20100101 Firefox/7.0.1");

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