AWS EC2 HTTP Post內容大小限制

Question

我通過REST與我的EC2實例上的程序進行通信，並且一切都正常運行，直到通過POST請求發送的JSON大小達到〜20KB。當我在本地計算機Web服務器上運行代碼時，我沒有這些問題，但是當我將代碼上傳到EC2時，數據包永遠不會到達服務器。

亞馬遜是否阻止了大約20KB的數據包以防止DoS攻擊？如果是的話，我該如何刪除此功能。我需要能夠將至少500KB的JSON發佈到我的實例。

我正在運行Restlet 2.1並使用Google GSON 2.2.2所以要運行下面的代碼，您需要先前鏈接中的org.restlet.jar和gson.jar。

此代碼啓動一個的Restlet服務器上的EC2實例：

import org.restlet.Application; 
import org.restlet.Component; 
import org.restlet.Restlet; 
import org.restlet.data.Protocol; 
import org.restlet.routing.Router; 
import org.restlet.service.LogService; 

public class StringApplication extends Application { 
    public static final int PORT = 8005; 
    public static void main(String[] args) throws Exception { 

     Component component = new Component(); 
     component.setLogService(new LogService(false)); 

     component.getDefaultHost().attach(new StringApplication()); 

     component.getServers().add(Protocol.HTTP, PORT); 
     component.start(); 
    } 

    @Override 
    public synchronized Restlet createInboundRoot() { 
     Router router = new Router(getContext()); 
     router.attachDefault(StringResource.class); 
     return router; 
    } 
}  

這裏是我的Restlet資源代碼

import java.lang.reflect.Type; 
import java.util.ArrayList; 

import org.restlet.resource.Get; 
import org.restlet.resource.Post; 
import org.restlet.resource.ServerResource; 

import com.google.gson.Gson; 
import com.google.gson.reflect.TypeToken; 

public class StringResource extends ServerResource { 
    private static ArrayList<String> strings = new ArrayList<String>(); 

    @Get 
    public String getStrings() { 
    Gson gson = new Gson(); 
    String output = gson.toJson(strings); 
    return output; 
    } 

    @Post 
    public void postStrings(String input) { 
     Gson gson = new Gson(); 
     Type collectionType = new TypeToken<ArrayList<String>>() { 
     }.getType(); 
     strings = gson.fromJson(input, collectionType); 
    } 
} 

最後，這裏是我的代碼創建用於測試不同的數據包大小。計數= 100（10KB）有效，計數= 1000（100KB）超時。

import java.io.IOException; 
import java.lang.reflect.Type; 
import java.util.ArrayList; 

import org.restlet.Client; 
import org.restlet.Request; 
import org.restlet.Response; 
import org.restlet.data.MediaType; 
import org.restlet.data.Method; 
import org.restlet.data.Protocol; 
import org.restlet.representation.Representation; 

import com.google.gson.Gson; 
import com.google.gson.reflect.TypeToken; 

public class StringDemo { 

    private static final int COUNT = 1000; 
    private static final String STRING = "THIS IS MY VERY LONG STRING AND IT IS FUN TO READ"; 
    private static final String SERVER_ADDRESS = "http://localhost:" + StringApplication.PORT; 

    public static void main(String[] args) throws IOException { 
     Gson gson = new Gson(); 
     Client client = new Client(Protocol.HTTP); 
     Request request = new Request(); 
     request.setResourceRef(SERVER_ADDRESS); 
     request.setMethod(Method.POST); 
     ArrayList<String> strings = generateStrings(); 
     String json = gson.toJson(strings); 
     request.setEntity(json, MediaType.APPLICATION_JSON); 

     System.out.println("JSON bytesize " + json.length() * Character.SIZE/Byte.SIZE); 
     Response handle = client.handle(request); 
     Representation entity = handle.getEntity(); 

     if (handle.getStatus().isSuccess()) { 
      System.out.println("Successfully uploaded strings"); 
     } else { 
      System.out.println(entity != null ? entity.getText() : "no response from server"); 
     } 

     request = new Request(); 
     request.setResourceRef(SERVER_ADDRESS); 
     request.setMethod(Method.GET); 

     handle = client.handle(request); 
     entity = handle.getEntity(); 

     if (handle.getStatus().isSuccess()) { 
      Type collectionType = new TypeToken<ArrayList<String>>() { 
      }.getType(); 
      strings = gson.fromJson(entity.getReader(), collectionType); 
      System.out.println("Received " + strings.size() + " strings"); 
     } else { 

      System.out.println(entity != null ? entity.getText() : "no response from server"); 
     } 

    } 

    private static ArrayList<String> generateStrings() { 
     ArrayList<String> strings = new ArrayList<String>(COUNT); 
     for (int i = 0; i < COUNT; i++) { 
      strings.add(STRING); 
     } 
     return strings; 
    } 

} 

您必須SERVER_ADDRESS更改爲您運行的問題會消失，當您使用較大的一個實例上

Answer 1

代碼中的EC2實例。這些問題似乎與amazon提供的免費級機器的默認配置有關。