Your Keep-Alive Is Lying to You: Six Connection Myths I Measured on a Free Model Server

说明与用途

在免费模型 API 上，空闲后延迟会增加 4‑5 倍。需要测量真实延迟并相应调整重试/超时策略。

问题

Developers rely on keep‑alive and retry advice without measuring real latency on free model endpoints, leading to mis‑tuned timeout and retry logic.

结果

Free tier endpoints exhibit significantly higher latency after idle periods; keep‑alive does not mitigate this. Developers should measure latency and adjust retry/timeout logic accordingly.

工作流

• 1. Write a probe script that warms the connection and records latency.
• 2. Run the probe with a specified idle gap (e.g., 300 s) for multiple rounds.
• 3. Record and analyze latency for warm and idle requests.
• 4. Repeat the test using a persistent connection (keep‑alive) to compare performance.
• 5. Adjust client retry and timeout settings based on observed latency patterns.

证据

Notice something? The warm baseline is ~400 ms. The idle requests are 4-5x slower. Every single time.

来源

Free tiers have SLAs. They have capacity guarantees. Free tiers don't.

来源