But I want to make my question more precise:

Is it possible to the this jsonrpc working with a session_id of a public user? (not logged in)

import requests

import json

url = "https://73515246-18-0-all.runbot185.odoo.com/web/dataset/call_kw/forum.post/web_search_read"

payload = json.dumps({

"id": 1,

"jsonrpc": "2.0",

"method": "call",

"params": {

"model": "res.partner",

"method": "web_search_read",

"args": [],

"kwargs": {

"specification": {

"name": {}

},

"order": "name",

"domain": [],

"context": {

"uid": None

}

}

}

})

headers = {

'Content-Type': 'application/json',

'Cookie': 'session_id=clfQpy5iv6hb5cq9VacECtum8t2bPZ1OhBwZ5AEr9ya_4xj-I84eUSrEJKSOLhCy9JcXhpOq8QSmusQ3S08M'

}

response = requests.request("GET", url, headers=headers, data=payload)

print(response.text)

Just create a publicly accessible controller and use as any REST.
For example, the below GET endpoint can be accessed by just visiting /thank_you.

from odoo import http

class ThankYouController(http.Controller):

​@http.route('/thank_you', auth='public', methods=['GET'], type='http')

​def thank_you(self, **kwargs):

​ ​return "THANK YOU"