{"model":"qwen-max","input":{"messages":[{"role": "system","content":"You are a helpful assistant."},{"role":"user","content":"入参"}]},"parameters":{}}
这样能正确返回。

{"model":"qwen-max","input":{"messages":[{"role": "system","content":"You are a helpful assistant."},{"role":"user","content":"入参"},{"role": "system","content":"首次返回的文本"},{"role":"user","content":"继续"}]},"parameters":{}}
这样写提示错误信息，message的大概意思是body格式错误。

{"model":"qwen-max","input":{"messages":[{"role":"user","content":"继续"}]},"parameters":{}}
这样写，会回复 有什么问题需要帮忙什么的...。