AWS API Gateway: Use Mock Integration to echo response body

Question

I am trying to use the Mock integration to just "echo" back me the JSON body that I sent. However, I just can't get it to work. I can return any arbitrary JSON body from my "POST - Integration Response", but the request JSON is never found via $input.json('$'). I have been able to successfully echo back any query parameters.

My API has a single "/" path and a single method defined (POST). The exported yaml is here .

Any idea as to what may be going on?

score 30 · Answer 1 · answered Apr 28 '20 at 14:17

30

I've found this to actually be possible, although a little hacky. First, in the integration request mapping template you store the body in a path parameter.

#set($context.requestOverride.path.body = $input.body)
{
  "statusCode": 200,
}

Then in the integration response mapping template you fetch it back and return it.

#set($body = $context.requestOverride.path.body)
{
  "statusCode": 200,
  "body": $body,
}

This seems to even work well with larger payloads.

answered Apr 28 '20 at 14:17

matthewdaniel

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This work for me, also to add to the, if you want to parse body and extract it we can use `"someVar": $util.parseJson($body).someVar,` – Tarek El-Mallah Dec 07 '20 at 03:22

score 11 · Accepted Answer · answered Dec 22 '17 at 18:02

11

Unfortunately this is not supported. In the mapping template for "Integration Response", $input represents the payload received from the integration response (which is empty in the case of a MOCK integration.

answered Dec 22 '17 at 18:02

jackko

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Ah, wait. How can I access the input query parameters then? – user23714 Dec 23 '17 at 22:43
I would like to know as well if this is possible now. – Robert Garcia Feb 22 '19 at 23:48
Query params and headers pass as usual for me (using method request passthrough template). but the body is always {} from Mock. – antonioortegajr Apr 04 '19 at 17:41
1

not sure if it is "supported" but there is a way to do this. See my answer below. – matthewdaniel Jun 30 '20 at 18:05

score 1 · Answer 3 · answered Apr 02 '19 at 03:10

1

You can set up a lambda function for echoing purposing, something like that:

exports.handler = async (event) => {
    return event;
};

answered Apr 02 '19 at 03:10

user2095948

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AWS API Gateway: Use Mock Integration to echo response body

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