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我正在嘗試使用Google App Engine製作應用程序。部分功能要求我通過http從第三方服務器提取日曆數據。需要注意的是，我要連接的服務器不使用ssl。所以目標網址只包含「http：//」。在Google App Engine測試服務器上發出http請求時發生SSLHandshakeException（Java）
無論如何，我在普通Java應用程序中編寫了一些代碼作爲概念驗證。
try {
// Create url
URL targetUrl = new URL(target);
// Open the connection
URLConnection connection = targetUrl.openConnection();
// Create InputStream
InputStream inStream = connection.getInputStream();
// Parse calendar data using iCal4j
CalendarBuilder builder = new CalendarBuilder();
theCalendar = builder.build(inStream);
// Close the connection
inStream.close();
} catch(IOException e) {
e.printStackTrace();
} catch (ParserException e) {
e.printStackTrace();
}
因此，我在Java應用程序中運行了這段代碼，它像一個魅力一樣工作。看到它的工作後，我決定嘗試將相同的代碼放入我在Google App Engine項目中創建的測試servlet中。然而，在允許其執行，我得到這個錯誤：
javax.net.ssl.SSLHandshakeException: Could not verify SSL certificate for URL: http://the_url
at com.google.appengine.api.urlfetch.URLFetchServiceImpl.convertApplicationException(URLFetchServiceImpl.java:175)
at com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch(URLFetchServiceImpl.java:45)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.fetchResponse(URLFetchServiceStreamHandler.java:543)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getInputStream(URLFetchServiceStreamHandler.java:422)
at java.net.URL.openStream(URL.java:1037)
at com.amftech.website.CalendarServlet.doGet(CalendarServlet.java:36)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:134)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:95)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:508)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
我也注意到，在啓動服務器，下面的警告被輸出：
Jun 12, 2017 2:43:14 PM com.google.appengine.repackaged.com.google.protobuf.UnsafeUtil supportsUnsafeByteBufferOperations
WARNING: platform method missing - proto runtime falling back to safer methods: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "accessClassInPackage.sun.misc")
Jun 12, 2017 2:43:14 PM com.google.appengine.repackaged.com.google.protobuf.UnsafeUtil supportsUnsafeArrayOperations
WARNING: platform method missing - proto runtime falling back to safer methods: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "accessClassInPackage.sun.misc")
Jun 12, 2017 2:43:14 PM com.google.appengine.repackaged.com.google.protobuf.UnsafeUtil supportsUnsafeCopyMemory
WARNING: copyMemory is missing from platform - proto runtime falling back to safer methods.
我不知道，如果這些警告意味着什麼，但我認爲他們可能。我的測試服務器設置有問題嗎？我的項目設置？我搜索了整個互聯網，除了「確保您下載證書」之外沒有發現任何內容。但是我連接的服務器甚至不使用SSL，那麼爲什麼它會抱怨SSL握手呢？