Cheng Peng Cheng Peng - 7 months ago 61
Python Question

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

I'm stuck at a point to implement the upload function in my web application using GAE. After submitting at /signup page, it redirects to /upload_file page, while it prompts the error 405 Method Get not allowed, and I was expecting to see the upload form.

(Got some Reference from: https://github.com/GoogleCloudPlatform/python-docs-samples/blob/master/appengine/blobstore/main.py)

Appreciate any help!

Part of the code in a main python script:

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

After submitting at /signup page, it redirects to /upload_file page, while it prompts the error 405 Method Get not allowed, and I was expecting to see the upload form.

I think herein lies the problem. After sign up you're redirecting to /upload_file page which is mapped to FileUploadHandler, as follows: ('/upload_file', FileUploadHandler),. Now note that FileUploadHandler has no get method to handle your redirect.

What I reckon you wanted to achieve is to render your upload_file template(which contains your upload form) after signup and you already have the logic setup in class FileUploadFormHandler. So you should instead map the /upload_file route to FileUploadFormHandler

Also you will need a route to handle the call to your FileUploadHandler when creating the upload url for the form the user will fill.

such as:

class FileUploadFormHandler(BaseHandler): 
    def get(self):
        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)

NOTE: You should probably come up with less confusing url paths ;)

Comments