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自从上周四我们一直在经历从Google App Engine发布的urlfetch错误。通常这些时间会持续数个小时，并导致我们的应用程序在授权期间失败通过OAuth2操场进行测试有时也会出现问题。URL抓取和oAuth2游乐场500错误
从操场试图为它报告辅币授权代码时：
Something bad happened: 500 HTTP error.
Message: 500 Server Error
Error: Server Error
The server encountered an error and could not complete your request.
If the problem persists, please report your problem and mention this
error message and the query that caused it
在我们的代码报告的授权请求：
Uncaught exception from servlet
com.google.apphosting.api.DeadlineExceededException: This request (3544c942ab0ce9ec) started at 2013/06/11 11:17:17.608 UTC and was still executing at 2013/06/11 11:18:17.027 UTC.
at sun.misc.Unsafe.park(Native Method)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(AbstractQueuedSynchronizer.java:1033)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1326)
at com.google.common.util.concurrent.AbstractFuture$Sync.get(AbstractFuture.java:268)
at com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:96)
at com.google.appengine.tools.development.TimedFuture.get(TimedFuture.java:57)
at com.google.common.util.concurrent.ForwardingFuture.get(ForwardingFuture.java:69)
at com.google.apphosting.runtime.ApiProxyImpl.doSyncCall(ApiProxyImpl.java:230)
at com.google.apphosting.runtime.ApiProxyImpl.access$000(ApiProxyImpl.java:67)
at com.google.apphosting.runtime.ApiProxyImpl$1.run(ApiProxyImpl.java:201)
at com.google.apphosting.runtime.ApiProxyImpl$1.run(ApiProxyImpl.java:198)
at java.security.AccessController.doPrivileged(Native Method)
at com.google.apphosting.runtime.ApiProxyImpl.makeSyncCall(ApiProxyImpl.java:198)
at com.google.apphosting.runtime.ApiProxyImpl.makeSyncCall(ApiProxyImpl.java:67)
at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:111)
at com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch(URLFetchServiceImpl.java:38)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.fetchResponse(URLFetchServiceStreamHandler.java:417)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getInputStream(URLFetchServiceStreamHandler.java:296)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getResponseCode(URLFetchServiceStreamHandler.java:149)
at com.google.api.client.http.javanet.NetHttpResponse.<init>(NetHttpResponse.java:37)
at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:95)
at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:980)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:412)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:345)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:463)
at com.ourapp.server.OAuthMethods2.handleCallbackIfRequired(OAuthMethods2.java:127)
at com.ourapp.server.OAuthServlet2.handleCallbackIfRequired(OAuthServlet2.java:81)
at com.ourapp.server.AuthLandingServlet.handleCallbackIfRequired(AuthLandingServlet.java:1)
at com.ourapp.server.AuthLandingServlet.doGet(AuthLandingServlet.java:30)
或以其他形式
Uncaught exception from servlet
java.net.SocketTimeoutException: Timeout while fetching URL: https://accounts.google.com/o/oauth2/token
at com.google.appengine.api.urlfetch.URLFetchServiceImpl.convertApplicationException(URLFetchServiceImpl.java:142)
at com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch(URLFetchServiceImpl.java:43)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.fetchResponse(URLFetchServiceStreamHandler.java:417)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getInputStream(URLFetchServiceStreamHandler.java:296)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getResponseCode(URLFetchServiceStreamHandler.java:149)
at com.google.api.client.http.javanet.NetHttpResponse.<init>(NetHttpResponse.java:37)
at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:95)
at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:980)
at com.google.api.client.auth.oauth2.TokenRequest.executeUnparsed(TokenRequest.java:299)
at com.google.api.client.auth.oauth2.TokenRequest.execute(TokenRequest.java:323)
at com.google.api.client.auth.oauth2.Credential.executeRefreshToken(Credential.java:607)
at com.google.api.client.googleapis.auth.oauth2.GoogleCredential.executeRefreshToken(GoogleCredential.java:324)
at com.google.api.client.auth.oauth2.Credential.refreshToken(Credential.java:526)
at com.google.api.client.auth.oauth2.Credential.intercept(Credential.java:287)
at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:836)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:412)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:345)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:463)
at com.ourapp.server.AuthLandingServlet.doGet(AuthLandingServlet.java:34)
导致超时的确切代码是：
GoogleTokenResponse response = new GoogleAuthorizationCodeTokenRequest(
transport,
jsonFactory,
clientSecrets.getWeb().getClientId(),
clientSecrets.getWeb().getClientSecret(),
code,
clientSecrets.getWeb().getRedirectUris().get(0)).execute();
任何想法与AppEngine有什么关系？
Google已通过其停机通知组确认此问题：https：//groups.google.com/forum/?fromgroups#!topic/google-appengine-downtime-notify/TqKVL9TNq2A –