Google Places Autocomplete会话令牌过期时间及有效性咨询

Great question—let’s unpack this clearly, since the behavior you’re seeing might seem contradictory to the official docs at first glance.

First, let’s cut to the chase: session tokens are NOT permanently tied to a specific IP, nor are they ever intended to be permanent. The official note about expiring after "a few minutes" is the intended behavior, even if your testing showed otherwise.

Here’s why you might have gotten valid responses with the same token days apart:

• Caching edge cases: Google’s servers might cache autocomplete responses for identical requests (same input, key, and token) even after the token itself has expired. This isn’t a sign the token is still active—it’s just the API serving a cached result to optimize performance.
• Flexible expiry windows: While Google states tokens expire quickly, the exact timing isn’t a hard, fixed number. There might be a small grace period or variability in how expiry is enforced, but this is not something you can rely on.
• Non-strict error handling: The API might not immediately reject an expired token with a hard error. Instead, it might treat the request as a new, unassociated session (which could still return valid results, but defeats the token’s purpose of grouping requests for billing).

Remember, the core purpose of a session token is to group sequential autocomplete requests from the same user (e.g., as they type a location) into a single session for accurate billing (Google charges per session, not per request). Reusing tokens long-term breaks this logic and could lead to unexpected billing or inconsistent behavior.

Best Practices #

• Generate a new session token every time a user starts a new search flow (e.g., when they click into the search input, or start typing a new query).
• Don’t rely on expired tokens working—treat the "few minutes" expiry as a hard rule, even if you see occasional exceptions.

内容的提问来源于stack exchange，提问作者Asaf HorVitz