Handle python session requests/response in modify_chunk_response plugin

[ananth-sivam]

@abhinavsingh
I have used the modify_chunk_response plugin to modify an upstream response header and publish it to client.
Here the client is using python requests.Session() to do GET/POST/PUT via https.

Below is the UT that I have to mimick the client and the last assert is failing as assert 'https://httpbin.org/get' == 'https://httpbin.org/post'

UT
session = requests.Session()
r1 = session.get( "https://httpbin.org/get", proxies={"https": "http://127.0.0.1:8899"}, verify=False, )
assert r1.json().get("url") == "https://httpbin.org/get"
r2 = session.post( "https://httpbin.org/post", proxies={"https": "http://127.0.0.1:8899"}, verify=False, )
assert r2.json().get("url") == 'https://httpbin.org/post'

OR below was executed after starting the python -m proxy --plugins proxy.plugin.ModifyChunkResponsePlugin

r1 = session.get( "http://httpbin.org/get", proxies={"http": "http://127.0.0.1:8899"}, verify=False, );print("R1: ",r1.json().get("url"));r2 = session.post( "http://httpbin.org/post", proxies={"http": "http://127.0.0.1:8899"}, verify=False, );print("R2: ",r2.json().get("url"));

Below is the print output
R1: http://httpbin.org/get
R2: http://httpbin.org/get

proxy version: 2.4.3
Any help is appreciated.