CORS causes PutMethod operation: Method already exists ...

[chrisgilmerproj]

When I use the new CORS settings I get an error. Here is my method:

@app.route('/',             
           methods=['OPTIONS', 'HEAD', 'GET', 'POST'],
           cors=True)
def do_something():  

Gives me this error when I deploy:

. env/bin/activate; chalice deploy --no-autogen-policy
Updating lambda function...
Regen deployment package...
Sending changes to lambda.
Lambda deploy done.
API Gateway rest API already found.
Deleting root resource id
Done deleting existing resources.
Traceback (most recent call last):
  File "/home/chrisgilmerproj/myapp/api/env/bin/chalice", line 11, in <module>
    load_entry_point('chalice==0.3.0', 'console_scripts', 'chalice')()
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/chalice/cli/__init__.py", line 265, in main
    return cli(obj={})
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/click/core.py", line 716, in __call__
    return self.main(*args, **kwargs)
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/click/core.py", line 696, in main
    rv = self.invoke(ctx)
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/click/core.py", line 1060, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/click/core.py", line 889, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/click/core.py", line 534, in invoke
    return callback(*args, **kwargs)
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/chalice/cli/__init__.py", line 175, in deploy
    d.deploy(config)
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/chalice/deployer.py", line 246, in deploy
    config)
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/chalice/deployer.py", line 682, in deploy
    return self._create_resources_for_api(config, rest_api_id)
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/chalice/deployer.py", line 738, in _create_resources_for_api
    route_builder.build_resources(url_trie)
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/chalice/deployer.py", line 298, in build_resources
    current['resource_id'], current['route_entry'].methods)
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/chalice/deployer.py", line 916, in create_preflight_method
    authorizationType='NONE',
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/botocore/client.py", line 159, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/home/chrisgilmerproj/myapp/api/env/local/lib/python2.7/site-packages/botocore/client.py", line 494, in _make_api_call
    raise ClientError(parsed_response, operation_name)
botocore.exceptions.ClientError: An error occurred (ConflictException) when calling the PutMethod operation: Method already exists for this resourcemyapp

When I turn off CORS like this:

@app.route('/',             
           methods=['OPTIONS', 'HEAD', 'GET', 'POST'],
           cors=False)
def do_something():  

It totally works.

I just wanted to report this in case you knew of an easy fix. I'll provide more info if it will help.

[jamesls]

This is because of the OPTIONS method you have called out in your methods=[...]. When cors=True, we automatically inject an OPTIONS method to support preflight requests. This will cause the error because we'll also try to create another OPTIONS method the points to your view function.

If you don't need the OPTIONS method, the simplest fix would be to remove it from your methods=[].

That error message should be better though.

[chrisgilmerproj]

Thank you for fixing this!