更新后谷歌云端点回调答案

【问题标题】：google cloud endpoint callback after update更新后谷歌云端点回调
【发布时间】：2013-03-15 14:03:11
【问题描述】：

是否可以使用云端点方法作为上传回调？ uploadUrl 是使用 blobservice 生成的。

String url = blobstoreService.createUploadUrl("/_ah/api/project/v1/uploadcallback" , options);

目前，我从应用引擎服务器收到 404 响应。

我从本地测试服务器收到以下异常：

HTTP ERROR 500

Problem accessing /_ah/upload/agtrdWJpdHktdGVzdHIbCxIVX19CbG9iVXBsb2FkU2Vzc2lvbl9fGAEM. Reason:

    Unexpected character ('-' (code 45)) in numeric value: expected digit (0-9) to follow minus sign, for valid numeric value
 at [Source: java.io.StringReader@3d3f1775; line: 1, column: 3]

Caused by:

com.google.appengine.repackaged.org.codehaus.jackson.JsonParseException: Unexpected character ('-' (code 45)) in numeric value: expected digit (0-9) to follow minus sign, for valid numeric value
 at [Source: java.io.StringReader@3d3f1775; line: 1, column: 3]
    at com.google.appengine.repackaged.org.codehaus.jackson.JsonParser._constructError(JsonParser.java:1432)
    at com.google.appengine.repackaged.org.codehaus.jackson.impl.JsonParserMinimalBase._reportError(JsonParserMinimalBase.java:385)
    at com.google.appengine.repackaged.org.codehaus.jackson.impl.JsonParserBase.reportUnexpectedNumberChar(JsonParserBase.java:960)
    at com.google.appengine.repackaged.org.codehaus.jackson.impl.ReaderBasedParser._handleInvalidNumberStart(ReaderBasedParser.java:957)
    at com.google.appengine.repackaged.org.codehaus.jackson.impl.ReaderBasedParser.parseNumberText(ReaderBasedParser.java:671)
    at com.google.appengine.repackaged.org.codehaus.jackson.impl.ReaderBasedParser.nextToken(ReaderBasedParser.java:476)
    at com.google.appengine.repackaged.org.codehaus.jackson.map.ObjectMapper._initForReading(ObjectMapper.java:2761)
    at com.google.appengine.repackaged.org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2709)
    at com.google.appengine.repackaged.org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1854)
    at com.google.api.server.spi.tools.devserver.RestApiServlet$LilyRequestMarshaller.createBackendRequestBody(RestApiServlet.java:76)
    at com.google.api.server.spi.tools.devserver.RestApiServlet$LilyRequestMarshaller.marshall(RestApiServlet.java:59)
    at com.google.api.server.spi.tools.devserver.RestApiServlet$LilyRequestMarshaller.access$100(RestApiServlet.java:54)
    at com.google.api.server.spi.tools.devserver.RestApiServlet.service(RestApiServlet.java:144)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97)
    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:94)
    at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:327)
    at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
    at com.google.appengine.api.blobstore.dev.UploadBlobServlet.handleUpload(UploadBlobServlet.java:432)
    at com.google.appengine.api.blobstore.dev.UploadBlobServlet.access$000(UploadBlobServlet.java:71)
    at com.google.appengine.api.blobstore.dev.UploadBlobServlet$1.run(UploadBlobServlet.java:117)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.google.appengine.api.blobstore.dev.UploadBlobServlet.doPost(UploadBlobServlet.java:114)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:123)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:61)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:94)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:409)
    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$RequestHandler.content(HttpConnection.java:938)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

【问题讨论】：

标签： google-app-engine google-cloud-endpoints

【解决方案1】：

来自Uploading a Blob：

表单必须包含文件上传字段，并且表单的 enctype 必须设置为multipart/form-data。当用户提交表单时， POST 由创建 Blob 的 Blobstore API 处理。 API 还为 blob 创建一条信息记录并将记录存储在数据存储，并将重写的请求传递给您的应用程序给定路径作为 blob 键。

由于 Endpoints 不（据我所知）接受 multipart/form-data 作为有效编码，因此这不起作用。您看到的错误消息是因为 Endpoint 需要 JSON。

【讨论】：

感谢您的回答，我将监控请求响应以检查其构建方式。

【解决方案2】：

我遇到了完全相同的问题。看来这是端点的问题以及正在发布 JSON 的事实。

最后，我只是走出了 Endpoints 框架，让一个自定义 servlet 处理 POST。

到目前为止，其他所有内容仍在端点内。

【讨论】：