Google App Engine：405 Method GET is not allowed for this resource

Question

我在使用 GAE 在我的 Web 应用程序中实现上传功能时遇到了困难。在 /signup 页面提交后，它重定向到 /upload_file 页面，同时提示错误 405 Method Get not allowed，我期待看到上传表单。

（得到一些参考：https://github.com/GoogleCloudPlatform/python-docs-samples/blob/master/appengine/blobstore/main.py）

感谢任何帮助！

主要python脚本中的部分代码：

class FileUploadFormHandler(BaseHandler): 
# BaseHandler is a subclass of webapp2.RequestHandler.
    def get(self):
        # create an upload URL for the form that the user will fill out
        upload_url = blobstore.create_upload_url('/upload_file')

        self.render('upload-file.html', upload_url = upload_url)

class FileUploadHandler(blobstore_handlers.BlobstoreUploadHandler):
    def post(self):

        upload = self.get_uploads('file')[0]  ## 'file' is a var in the upload-file.html
        blob_key = upload.key()
        blob_reader = blobstore.BlobReader(blob_key) # instantiate a BlobReader for a given BlobStore value.
        locations = parsefile(blob_reader)
        img_url = generate_url(locations=locations)
        self.redirect('/view_map/%s' % img_url)

app = webapp2.WSGIApplication([('/', Home),
                           ('/signup', Register),
                           ('/login', Login),
                           ('/logout', Logout),
                           ('/upload_file', FileUploadHandler),
                           ('/view_map/([^/]+)?', ViewMap)
                           ],
                          debug=True)

Answer 1

在/signup页面提交后，重定向到/upload_file页面，同时提示错误405 Method Get not allowed，我期待看到上传表单。

我认为这就是问题所在。注册后，您将重定向到映射到FileUploadHandler 的/upload_file 页面，如下所示：('/upload_file', FileUploadHandler),。现在请注意，FileUploadHandler 没有 get 方法 来处理您的重定向。

我认为您想要实现的是在注册后呈现您的upload_file 模板（其中包含您的上传表单），并且您已经在class FileUploadFormHandler 中设置了逻辑。所以你应该将/upload_file 路由映射到FileUploadFormHandler

在为用户填写的表单创建上传 URL 时，您还需要一个路由来处理对您的 FileUploadHandler 的调用。

如：

class FileUploadFormHandler(BaseHandler): 

    def get(self):
        # upload_url handles the POST call to FileUploadHandler
        upload_url = blobstore.create_upload_url('/upload')
        self.render('upload-file.html', upload_url = upload_url)

...

app = webapp2.WSGIApplication(
    [('/upload', FileUploadHandler),
     ('/upload_file', FileUploadFormHandler),
    ], debug=True)

---

注意：您可能应该想出较少混淆的 url 路径；)