Http请求入参问题

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通过http请求指令，调用AI接口，响应一直有问题，感觉是入参的格式问题，但不知道怎么解决，求助大佬们。

具体流程如下：

运行后的响应信息：

xbot_visual_web_service_rest_response(status_code=400, content_type='application/json', content_encoding='', content='{"error":{"message":"JSON parse error: Unexpected character (\'\'\' (code 39)): was expecting double-quote to start field name; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Unexpected character (\'\'\' (code 39)): was expecting double-quote to start field name\\n at [Source: (org.springframework.util.StreamUtils$NonClosingInputStream); line: 6, column: 28] (through reference chain: com.wd.paas.api.domain.v4.chat.ChatCompletionRequest[\\"messages\\"]->java.util.ArrayList[0]->com.wd.paas.api.domain.v4.chat.ChatMessage[\\"content\\"])","code":"400"}}')