How can I make apigateway forward root path to integrated http endpoint? - amazon-web-services

Question

I created a REST api gateway in AWS and configure it to pass through all requests to a http endpoint. The configuration I have is
After deploy to a stage (dev) it gives me an invoke URL, like https://xxxx.execute-api.ap-southeast-2.amazonaws.com/dev,
it works fine if I invoke the url by appending a sub path like: https://xxxx.execute-api.ap-southeast-2.amazonaws.com/dev/xxxxx`, I can see it forward the request to downstream http endpoint. However it doesn't forward any request if I invoke the base url: https://xxxx.execute-api.ap-southeast-2.amazonaws.com/dev. How can I make it work with the base invoke url without any subpath?
I tired to add an additional / path resource in API gateway but it doesn't allow me to add it.

Answer 1

The application must be able to receive requests at any path, including the root path: /. An API Gateway resource with a path of /{proxy+} captures every path except the root path. Making a request for the root path results in a 403 response from API Gateway with the message Missing Authentication Token.
To fix this omission, add an additional resource to the API with the path set to / and link that new resource to the same http endpoint as used in the existing /{proxy+} resource.
The updated OpenAPI document now looks like the following code example:
{
"openapi": "3.0",
"info": {
"title": "All-capturing example",
"version": "1.0"
},
"paths": {
"/": {
"x-amazon-apigateway-any-method": {
"responses": {},
"x-amazon-apigateway-integration": {
"httpMethod": "POST",
"type": "aws_proxy",
"uri": ""
}
}
},
"/{proxy+}": {
"x-amazon-apigateway-any-method": {
"responses": {},
"x-amazon-apigateway-integration": {
"httpMethod": "POST",
"type": "aws_proxy",
"uri": ""
}
}
}
}
}