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Implement If-Match Precondition Update in Python

A mock resource store that uses the If-Match header's ETag to guard updates, preventing overwrites from stale clients.

from dataclasses import dataclass
from typing import Optional


@dataclass
class Resource:
    id: str
    version: int = 1
    data: str = ""
    etag: str = "etag-1"


class MockResourceStore:
    def __init__(self):
        self.resources = {}

    def update(self, resource_id: str, new_data: str, if_match: Optiona…

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