google-app-engine - 在托管虚拟机的本地开发环境中运行 Web 应用程序时出现 appengine.NewContext 错误

Question

我正在尝试在我的开发环境中使用本地托管虚拟机运行应用引擎的演示之一。当代码尝试为请求创建新上下文 (appengine.NewContext(r)) 时，请求会因 panic 而失败:

func handle(w http.ResponseWriter, r *http.Request) {
   if r.URL.Path != "/" {
    http.NotFound(w, r)
    return
   }

   c := appengine.NewContext(r)
   log.Infof(c, "Serving the front page.")
   tmpl.Execute(w, time.Since(initTime))
}

appengine.NewContext(r) 产生此错误:

2015/05/30 01:01:27 appengine: NewContext passed an unknown http.Request 
2015/05/30 01:01:27 http: panic serving 192.168.59.3:51889: appengine: NewContext passed an unknown http.Request 
goroutine 115 [running]: 
net/http.func·011() 
 /usr/local/go/src/net/http/server.go:1130 +0xbb 
log.Panic(0xc2080c6b10, 0x1, 0x1) 
 /usr/local/go/src/log/log.go:307 +0xb9 
google.golang.org/appengine/internal.WithContext(0x7f7072110508, 0xc20800a380, 0xc208031110, 0x0, 0x0) 
 google.golang.org/appengine/internal/api.go:247 +0x158 
google.golang.org/appengine.WithContext(0x7f7072110508, 0xc20800a380, 0xc208031110, 0x0, 0x0) 
 google.golang.org/appengine/appengine.go:35 +0x4e 
google.golang.org/appengine.NewContext(0xc208031110, 0x0, 0x0) 
 google.golang.org/appengine/appengine.go:28 +0x7f 
main28149.handle(0x7f70721103d0, 0xc208062d20, 0xc208031110) 
 helloworld.go:28 +0x8f 
net/http.HandlerFunc.ServeHTTP(0x8662e0, 0x7f70721103d0, 0xc208062d20, 0xc208031110) 
 /usr/local/go/src/net/http/server.go:1265 +0x41 

net/http.(*ServeMux).ServeHTTP(0xc208038e40, 0x7f70721103d0, 0xc208062d20, 0xc208031110) 
 /usr/local/go/src/net/http/server.go:1541 +0x17d 
net/http.serverHandler.ServeHTTP(0xc2080600c0, 0x7f70721103d0, 0xc208062d20, 0xc208031110) 
 /usr/local/go/src/net/http/server.go:1703 +0x19a 
net/http.(*conn).serve(0xc208062c80) 
 /usr/local/go/src/net/http/server.go:1204 +0xb57 
created by net/http.(*Server).Serve 
 /usr/local/go/src/net/http/server.go:1751 +0x35e

Dockerfile 是:

FROM gcr.io/google_appengine/go-compat
RUN rm -rf /goroot && mkdir /goroot && curl https://storage.googleapis.com/golang/go1.4.2.linux-amd64.tar.gz | tar xvzf - -C /goroot --strip-components=1
ADD . /app
RUN /bin/bash /app/_ah/build.sh

docker 镜像中似乎没有正确设置 appengine 环境。

如果有任何关于如何解决此问题的建议，我将不胜感激。

谢谢!

Answer 1

来自 Go App Engine for Managed VMs

appengine.Context has been replaced with the Context type from golang.org/x/net/context.