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Each replay uses a recreated ChatGPT interface so the placement can be read in its original conversational context. It is not a live or embedded chat.

1. ObservedAug 15, 2026Conversation1 turnsPlacementAfter turn 01 turns · After turn 0Replay chat
   Observed conversationAug 15, 2026 · interface recreation

   ChatGPTArchived view

   What does a 500 error mean compared with a 400 error?

   The difference is mainly who is considered responsible for the problem:

   • 400 error — Client-side error: The server received your request, but the request is invalid or malformed. Examples:

     • Missing or invalid parameters
     • Bad JSON
     • Invalid authentication format
     • Request doesn't meet the API's requirements

   • 500 error — Server-side error: Your request may be perfectly valid, but the server encountered an unexpected problem while trying to handle it. Examples:

     • Application bug/exception
     • Database failure
     • Server misconfiguration
     • Unexpected internal condition

   Easy way to remember:

   400 = “Your request is the problem.” 500 = “The server has a problem.”

   There are important variants too: 401/403 relate to authentication/authorization, 404 means the requested resource wasn't found, and 502/503/504 generally indicate problems involving a server or upstream service.

   

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