Interaction Between Flutter and FastAPI

Ubuntu 20.04LTS, with Python 3.8 for FastAPI, and Flutter 2.8.1, with Android SDK version 32.0.0.

I am trying to send a Map from Flutter to FastAPI.I have figured out how to POST, but how can I receive it from FastAPI side?

Is database necessary?

Flutter side:

import 'src/models/keywords_model.dart';import 'package:flutter/material.dart';import 'package:http/http.dart' show get, post;import 'dart:convert';class SearchScreen extends StatefulWidget {  const SearchScreen(List<KeywordsModel> keywords, {Key? key}) : super(key: key);  @override  _SearchScreenState createState() => _SearchScreenState();}class _SearchScreenState extends State<SearchScreen> {  final _formKey = GlobalKey<FormState>();  final List<String> keywords = [];  final Map<String, dynamic> keywordsMap = {};  Future<void> postKeywords(parsedJson) async {    await post(Uri.http("10.0.2.2:8000", "/search"), body: parsedJson);  }  @override  Widget build(BuildContext context) {    return Scaffold(      floatingActionButton: FloatingActionButton(        child: Icon(Icons.search),        onPressed: () {          print('---------------' * 20);          for (int i = 0 ; i < keywords.length ; i++) {            keywordsMap["$i"] = keywords[i];          }          var parsedJson = json.encode(keywordsMap);          postKeywords(parsedJson);        },      ),/// Skipped many lines    );  }}

FastAPI side:

from fastapi import FastAPIimport jsonapp = FastAPI()@app.post("/search/")async def receive_keywords():"""What to Put Here?"""    json.loads(?????)