Access headers in AWS API Gateway using HTTP Proxy? - aws-api-gateway

Question

I'm using AWS API Gateway and it's HTTP Proxy,
I need to pass Authorization header to my endpoint through AWS API Gateway
Things I've tried:
Setting Method Request like so,
Integration Request setup
This doesn't work, my app doesn't receive the Authorization header,
Also I've tried using mapping template
{
"method": "$context.httpMethod",
"body" : $input.json('$'),
"headers": {
#foreach($param in $input.params().header.keySet())
"$param": "$util.escapeJavaScript($input.params().header.get($param))" #if($foreach.hasNext),#end
#end
},
"queryParams": {
#foreach($param in $input.params().querystring.keySet())
"$param": "$util.escapeJavaScript($input.params().querystring.get($param))" #if($foreach.hasNext),#end
#end
},
"pathParams": {
#foreach($param in $input.params().path.keySet())
"$param": "$util.escapeJavaScript($input.params().path.get($param))" #if($foreach.hasNext),#end
#end
}
}
This also doesn't work.
How can this be accomplished?

Answer 1

API Gateway strips the AWS SigV4 Authorization header due to security reasons. If you are using other Authorization mechanism like OAuth, the header wouldn't be stripped.

Answer 2

Recently I had to try using an API Gateway HTTP proxy to pass an AWS SigV4 HTTP request to an endpoint.
After testing and debugging found that the Authorization is being consumed and not passed!
So while sending the request to the API Gateway - I sent Authorization and a copy of the Authorization as another header "myauth". (I was able to do this since the request is coming from my own client.)
In the method request I added Authorization and myauth as HTTP Headers
Method Request - HTTP Headers
In the Integration Request - HTTP Headers I mapped myauth to Authorization before it was forwarded to the endpoint
Integration Request - HTTP Headers
Dont know if this is the best way to do this or if there could be any potential issues but this worked! Hope this helps someone or gives some ideas.