检查API Gateway的路由设置，确保较特定的路由被放在更通用的路由之前。

例如，在API Gateway中有两个路由规则，一个是“/books”和另一个是“/books/{isbn}”。如果请求的URL是“/books/123”，API Gateway应该匹配较特定的路由“/books/{isbn}”，而不是更通用的路由“/books”。

以下是一个使用API Gateway的Lambda代理集成的示例代码。它展示了如何在API Gateway中设置路由优先级：

{
    "swagger": "2.0",
    "info": {
        "title": "My Book API",
        "version": "1.0"
    },
    "paths": {
        "/books": {
            "get": {
                "responses": {
                    "200": {
                        "description": "Returns a list of all books"
                    }
                },
                "x-amazon-apigateway-integration": {
                    "httpMethod": "GET",
                    "type": "aws_proxy",
                    "uri": "arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME"
                }
            }
        },
        "/books/{isbn}": {
            "get": {
                "responses": {
                    "200": {
                        "description": "Returns a book by ISBN"
                    }
                },
                "x-amazon-apigateway-integration": {
                    "httpMethod": "GET",
                    "type": "aws_proxy",
                    "uri": "arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME"
                }
            }
        }
    }
}