Question

当我向指定的网址发布帖子请求时，我遇到了Google App Engine超时的问题。当我在hurl.it处进行测试请求时，它完全正常。当我在本地服务器上运行代码时，运行完全正常。当我将其部署到Google App Engine并在线测试时，无论我给出多少超时限制（测试最多1分钟），它都会超时。我不知道是什么导致它在网上而不是在本地发生错误。这是我出错时的代码和堆栈跟踪：

package com.servlet.thing;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.net.ssl.HttpsURLConnection;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@SuppressWarnings("serial")
public class ServletThingServlet extends HttpServlet {
private static final String PASS = "testpassword123";

public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
    URL url = new URL("https://api.roblox.com/login/v1");
    HttpURLConnection con = (HttpURLConnection) url.openConnection();
    //URLConnection con = url.openConnection();
    con.setConnectTimeout(60000);
    // Doesn't get past here online
    resp.getWriter().println("connected");

    con.setDoOutput(true);
    con.setRequestMethod("POST");
    resp.getWriter().println("checkpoint 1");

    OutputStreamWriter writer = new OutputStreamWriter(con.getOutputStream());
    writer.write("username=TestPromotionAcc&password=" + PASS);
    writer.flush();
    writer.close();
    resp.getWriter().println("checkpoint 2");

    HashMap<String, List<String>> map = (HashMap<String, List<String>>) con.getHeaderFields();

    if (con.getResponseCode() == HttpURLConnection.HTTP_OK || con.getResponseCode() == HttpURLConnection.HTTP_NOT_FOUND) {
        StringBuffer response = new StringBuffer();
        String line;

        BufferedReader reader = new BufferedReader(new InputStreamReader(con.getInputStream()));

        while ((line = reader.readLine()) != null) {
            response.append(line);
        }

        System.out.println("--- HEADER FIELDS ---\n");

        for (Map.Entry<String, List<String>> entry : map.entrySet()) {
            if (entry.getKey().equalsIgnoreCase("set-cookie")) {
                System.out.println("Value : " + entry.getValue());
                resp.getWriter().println("Set cookies: " + entry.getValue());
            }
        }

        reader.close();
        System.out.println(response.toString());
    } else {
        resp.getWriter().println(con.getResponseCode() + ": " + con.getResponseMessage());
    }
}
}

这是堆栈跟踪：

来自servlet的未捕获异常 java.net.SocketTimeoutException：获取URL时超时：http://api.roblox.com/login/v1 在com.google.appengine.api.urlfetch.URLFetchServiceImpl.convertApplicationException（URLFetchServiceImpl.java:179）在com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch（URLFetchServiceImpl.java:45）在com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler $ Connection.fetchResponse（URLFetchServiceStreamHandler.java:543）在com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler $ Connection.getInputStream（URLFetchServiceStreamHandler.java:422）在com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler $ Connection.getResponseCode（URLFetchServiceStreamHandler.java:275）在com.servlet.thing.ServletThingServlet.doGet（ServletThingServlet.java:30）在javax.servlet.http.HttpServlet.service（HttpServlet.java:617）在javax.servlet.http.HttpServlet.service（HttpServlet.java:717）在org.mortbay.jetty.servlet.ServletHolder.handle（ServletHolder.java:511）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1166）在com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter（ParseBlobUploadFilter.java:125）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter（SaveSessionFilter.java:37）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter（JdbcMySqlConnectionCleanupFilter.java:60）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter（TransactionCleanupFilter.java:48）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在org.mortbay.jetty.servlet.ServletHandler.handle（ServletHandler.java:388）在org.mortbay.jetty.security.SecurityHandler.handle（SecurityHandler.java:216）在org.mortbay.jetty.servlet.SessionHandler.handle（SessionHandler.java:182）在org.mortbay.jetty.handler.ContextHandler.handle（ContextHandler.java:765）在org.mortbay.jetty.webapp.WebAppContext.handle（WebAppContext.java:418）在com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle（AppVersionHandlerMap.java:257）在org.mortbay.jetty.handler.HandlerWrapper.handle（HandlerWrapper.java:152）在org.mortbay.jetty.Server.handle（Server.java:326）在org.mortbay.jetty.HttpConnection.handleRequest（HttpConnection.java:542） at org.mortbay.jetty.HttpConnection $ RequestHandler.headerComplete（HttpConnection.java:923）在com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable（RpcRequestParser.java:76）在org.mortbay.jetty.HttpConnection.handle（HttpConnection.java:404）在com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest（JettyServletEngineAdapter.java:145）在com.google.apphosting.runtime.JavaRuntime $ RequestRunnable.run（JavaRuntime.java:511）在com.google.tracing.TraceContext $ TraceContextRunnable.runInContext（TraceContext.java:446）在com.google.tracing.TraceContext $ TraceContextRunnable $ 1.run（TraceContext.java:453）在com.google.tracing.CurrentContext.runInContext（CurrentContext.java:274）在com.google.tracing.TraceContext $ AbstractTraceContextCallback.runInInheritedContextNoUnref（TraceContext.java:312）在com.google.tracing.TraceContext $ AbstractTraceContextCallback.runInInheritedContext（TraceContext.java:304）在com.google.tracing.TraceContext $ TraceContextRunnable.run（TraceContext.java:450）在com.google.apphosting.runtime.ThreadGroupPool $ PoolEntry.run（ThreadGroupPool.java:235）在java.lang.Thread.run（Thread.java:745）

Answer 1

根据我的经验，截止日期不会在当地执行。如果您的请求exceeds 60 seconds，则会发生超时。为了克服这个问题，我将请求包装在一个任务中，这个任务有更宽松的10分钟来完成任务。要检查的其他事项 - 您是否正在运行应用实例，或者应用引擎是否必须启动新实例来处理openConnection？

发布请求在线时间，但不是本地[Google App Engine]

1 个答案: