zero cost failed requests 2

https://smart-wiki.win/index.php/Evaluating_the_Gemini_Flash_API_for_Cost-Effective_AI_Integration

When a request fails due to a server or network issue, you shouldn't be charged for that failed attempt. Zero cost failed requests means exactly that: if an API call or transaction doesn't go through, you're not billed. This helps prevent wasted spending on errors that aren't your fault.