Grouding on gemini 2 REST API

[jbg469]

I manage to curl a reply as so here

curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash-exp:generateContent?key=KEY"
-H 'Content-Type: application/json'
-X POST
-d '{
"contents": [{
"parts":[{"text": "Write a story about a magic backpack."}]
}]
}'

---

this works for gemini 1.5

echo '{"contents":
[{"parts": [{"text": "What is the current Google stock price?"}]}],
"tools": [{"google_search_retrieval": {
"dynamic_retrieval_config": {
"mode": "MODE_DYNAMIC",
"dynamic_threshold": 1,
}
}
}
]
}' > request.json

curl -X POST "https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-pro-002:generateContent?key=KEY"
-H "Content-Type: application/json"
-d @request.json > response.json

cat response.json

---- however with gemini 2.0 :

echo '{"contents":
[{"parts": [{"text": "What is the current Google stock price?"}]}],
"tools": [{"google_search": {
"dynamic_retrieval_config": {
"mode": "MODE_DYNAMIC",
"dynamic_threshold": 1,
}
}
}
]
}' > request.json

curl -X POST "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash-exp:generateContent?key=KEY"
-H "Content-Type: application/json"
-d @request.json > response.json

cat response.json
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 874 0 572 100 302 1568 828 --:--:-- --:--:-- --:--:-- 2394
{
"error": {
"code": 400,
"message": "Invalid JSON payload received. Unknown name "dynamic_retrieval_config" at 'tools[0].google_search': Cannot find field.",
"status": "INVALID_ARGUMENT",
"details": [
{
"@type": "type.googleapis.com/google.rpc.BadRequest",
"fieldViolations": [
{
"field": "tools[0].google_search",
"description": "Invalid JSON payload received. Unknown name "dynamic_retrieval_config" at 'tools[0].google_search': Cannot find field."
}
]
}
]
}
}

I can't seem to find relevant docs on the REST API I am constrained to this version and can't use the python library at the moment