AWS API Gateway: Pass Referrer URL

Question

Is it possible for requests to the API-Gateway to pass the referrer URL to Lambda? For example, I'd love to let my lambda functions know if a request comes from the domain "good.com" vs. "bad.com".

I'm familiar with the list of supported $context Variables and I know a referrer url is not in there. I'm wondering if there is another way. If it is possible, what steps do I need to take?

Federico klez Culloca · Accepted Answer · 2018-03-29 08:03:21Z

6

Here's how to do it.

As it turns out, the mapping template allows you to map HTTP headers, not just the list of supported variables in the documentation.
The HTTP header that contains the referrer domain is called "Origin". The header that contains the referer page URL is called "Referer".
So, for example, you can put this in your mapping template and it will grab the associated header information:
```
{
"origin" : "$input.params('origin')",
"referer" : "$input.params('referer')"
}
```

Origin grabs example.com. Referer grabs example.com/pagename

edited Mar 29, 2018 at 8:03

Federico klez Culloca

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answered Jun 20, 2016 at 7:28

user3303554

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4 Comments

bazaglia Over a year ago

It's returning null values for origin and referer headers. Although "$input.params('something')" works for any other HTTP-custom header. Any tip?

Jun Over a year ago

@FedericoklezCulloca Have u happened to see cases where there is no origin and no referer even though the requests are most probably invoked from a website?

Federico klez Culloca Over a year ago

@Jun I only fixed a missing quote in the answer. You should ask the user who wrote the answer.

Jun Over a year ago

@user3303554 Have u happened to see cases where there is no origin and no referer even though the requests are most probably invoked from a website? thanks

Community · Accepted Answer · 2017-05-23 10:30:40Z

1

It's an HTTP header, so if you are mapping HTTP headers in the template it will be passed to the Lambda function. Look at this answer for an example of how to map HTTP headers in the request template.

edited May 23, 2017 at 10:30

CommunityBot

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answered Jun 18, 2016 at 0:53

Mark B

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1 Comment

user3303554 Over a year ago

Thanks for the tip. It helped me answer question and I shared a specific answer below.

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