Google My Business information using Nifi

[#1]

I am working on the data extract from google my business api. To achieve this there is oauth2 process involved.First we need to get a uri for authorization and the we will get the response , In the response header we will get an url with code and we need to use a post command with that code to get a access token. My question is if i use invokehttpprocessor how can i get the response header back so that i can extract code from it.

[#2]

The response headers all come back as attributes in the FlowFile that goes to the downstream queue. See the following example for more details.

I've made a sample request to a test website on the internet:

I can then view the 'response' queue:

When I view the attributes in the FlowFile, I can get access to all of the HTTP headers that come back with the response: