代码在哪里?您的问题还有其他细节吗?对于正确的解决方案，请始终在您的问题中提供完整的详细信息.

在这里可能的情况
需要帮助带有:远程服务器返回了意外的响应:(400)错误的请求." [

Where is the code & other details in your question? For right solutions always provide complete details in your question.

Here possible cases
Need help with: "The remote server returned an unexpected response: (400) Bad Request."[^]