1. 在main.tf文件中定义API Gateway的资源。以下是一个示例：

resource "aws_api_gateway_rest_api" "cors_api" {
  name = "cors-api-example"
  description = "An example API Gateway with CORS enabled"
}

resource "aws_api_gateway_resource" "cors_resource" {
  rest_api_id = "${aws_api_gateway_rest_api.cors_api.id}"
  parent_id   = "${aws_api_gateway_rest_api.cors_api.root_resource_id}"
  path_part   = "cors"
}

resource "aws_api_gateway_method" "cors_options" {
  rest_api_id = "${aws_api_gateway_rest_api.cors_api.id}"
  resource_id = "${aws_api_gateway_resource.cors_resource.id}"
  http_method = "OPTIONS"

  response_parameters = {
    "method.response.header.Access-Control-Allow-Methods" = "'GET,PUT,POST,DELETE'"
    "method.response.header.Access-Control-Allow-Headers" = "'Content-Type,X-Amz-Date,Authorization,X-Api-Key,X-Amz-Security-Token'"
  }

  # Enable Mock integration
  request_parameters {
    "integration.request.header.Content-Type" = "'application/json'"
    "integration.request.header.X-Amz-Invocation-Type" = "'Event'"
  }

  integration {
    type = "MOCK"
    passthrough_behavior = "WHEN_NO_TEMPLATES"

    request_templates = {
      "application/json" = "{ \"statusCode\": 200 }"
    }
  }

  method_responses {
    status_code = 200

    response_parameters = {
      "method.response.header.Access-Control-Allow-Methods" = true,
      "method.response.header.Access-Control-Allow-Headers" = true
    }
  }
}

resource "aws_api_gateway_method" "cors_method" {
  rest_api_id = "${aws_api_gateway_rest_api.cors_api.id}"
  resource_id = "${aws_api_gateway_resource.cors_resource.id}"
  http_method = "POST"

  request_validator_id = "${aws_api_gateway_request_validator.cors_request_validator.id}"

  integration {
    type = "AWS_PROXY"
    uri = "${var.lambda_function_invoke_arn}"
    passthrough_behavior = "WHEN_NO_TEMPLATES"
    http_method = "POST"

    request_parameters = {
      "integration.request.header.Content-Type" = "'application/json'"
    }
  }

  method_responses {
    status_code = "200"
  }
}

resource "aws_api_gateway_request_validator" "cors_request_validator" {
  name = "cors_request_validator"
  rest_api_id = "${aws_api_gateway_rest_api.cors_api.id}"
  validate_request_body = false
  validate_request_parameters = false
}

resource "aws_lambda_permission" "cors_api_invoke_lambda_permission" {
  statement_id = "AllowAPIGatewayInvoke"