Fetching all the values stored in Cache or Map without passing key as reference

[#1]

I want to fetch all the values I have stored in a Map using Management UI APIs as given in "Get KeyValue Map in an environment".

Issue 1:Accessing in API Proxy using ServiceCallout

So,I framed the url as "https://api.enterprise.apigee.com/v1/organizations...<OrganisationName>/environments/test/keyvaluemaps/<Map_Name>

And used it in ServiceCallOut policy in my API Proxy.I have also included Basic Authentication Policy before ServiceCallOut.But its throwing below error in APIProxy,

"Execution of ServiceCallout Service-Callout-1 failed. Reason: ResponseCode 401 is treated as error

tried using Service callout to my Map which I created in KeyValue Operation Policy"

Issue 2 : Accessing in UI http://apigee.com/docs/management/apis/get/organiz...

I tried creating a KeyValue Map using API http://apigee.com/docs/management/apis/post/organi... and tried to use Get API.That is working fine if both creation and fetch done through APIs.

But when I create a Map in KeyValueMap policy and try to get the value through API,its throwing me

HTTP/1.1 404 Not Found

{ "code": "keyvaluemap.service.keyvaluemap_doesnt_exist", "message": "KeyValueMap MyCollectionMap does not exist", "contexts": [] }

So,I am getting two different types of errors when accessing in two ways.Please post me what is the solution to fetch all the values in a Map using API Proxy.