AWS API Gateway Appending Query String Twice - terraform

Question

I am trying to setup a simple demo endpoint via AWS API Gateway. Bellow is Terraform manifest which describes it.
It is essentially a GET /demo/hello/world endpoint which accepts a query string parameter return_to.
The terraform correctly creates all resources in AWS.
However, when I then make a request to gateway at /demo/hello/world?return_to=bbb, the backend service receives this request:
/demo/hello/world%3Freturn_to=bbb?return_to=bbb
As you can see the ?return_to=bbb from API Gateway is being URL encoded as if it were part of the path and then another query string is appended at the end.
Anybody could help me out how to fix this? I have been going through all the settings for few hours and can't figure out what is the issue and how to fix it.
resource "aws_api_gateway_rest_api" "api" {
name = "origin-${var.name}.${data.terraform_remote_state.setup.outputs.domain-name}"
description = "Proxy to handle requests to our API test"
}
resource "aws_api_gateway_resource" "demo" {
depends_on = ["aws_api_gateway_rest_api.api"]
rest_api_id = "${aws_api_gateway_rest_api.api.id}"
parent_id = "${aws_api_gateway_rest_api.api.root_resource_id}"
path_part = "demo"
}
resource "aws_api_gateway_resource" "hello" {
depends_on = ["aws_api_gateway_rest_api.api", "aws_api_gateway_resource.demo"]
rest_api_id = "${aws_api_gateway_rest_api.api.id}"
parent_id = "${aws_api_gateway_resource.demo.id}"
path_part = "hello"
}
resource "aws_api_gateway_resource" "world" {
depends_on = ["aws_api_gateway_rest_api.api", "aws_api_gateway_resource.hello"]
rest_api_id = "${aws_api_gateway_rest_api.api.id}"
parent_id = "${aws_api_gateway_resource.hello.id}"
path_part = "world"
}
resource "aws_api_gateway_method" "hello-world" {
depends_on = ["aws_api_gateway_resource.world"]
rest_api_id = "${aws_api_gateway_rest_api.api.id}"
resource_id = "${aws_api_gateway_resource.world.id}"
http_method = "GET"
authorization = "NONE"
request_parameters = {
"method.request.querystring.return_to" = true
}
}
resource "aws_api_gateway_integration" "hello-world" {
depends_on = ["aws_api_gateway_method.hello-world"]
rest_api_id = "${aws_api_gateway_rest_api.api.id}"
resource_id = "${aws_api_gateway_resource.world.id}"
http_method = "${aws_api_gateway_method.hello-world.http_method}"
integration_http_method = "GET"
type = "HTTP"
uri = "http://${lookup(var.demo-map, var.environment)}/demo/hello/world"
connection_type = "VPC_LINK"
connection_id = "${data.aws_api_gateway_vpc_link.vpclink.id}"
request_parameters = {
"integration.request.querystring.return_to" = "method.request.querystring.return_to"
}
}

Answer 1

I had the same error. Having the query parameters in the aws_api_gateway_method and removing from aws_api_gateway_integration solved my problem