The issue you're encountering seems to be related to how variables within system prompts are handled and replaced in the Dify workflow. In the LLM node, the message.content should be a string, but it appears to be an array of TextPromptMessageContent objects instead. This discrepancy is likely causing the "Bad Request Error" with error code 400.

To resolve this, ensure that the variables in the system prompt are correctly replaced with actual values before being passed to the LLM node. The message.content should be a single string after variable replacement, not an array. You might need to adjust the code to concatenate the data attributes of the TextPromptMessageContent objects into a single string before assigning it to message.content.

Additionally, verify that all required parameters, such as messages[0].content[0].type, are correctly set in the request payload. This will help prevent the "Missing required parameter" error.

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