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Showing content from https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/forward-custom-headers.html below:

Add custom headers to origin requests

You can configure CloudFront to add custom headers to the requests that it sends to your origin. You can use custom headers to send and gather information from your origin that you don’t get with typical viewer requests. You can even customize the headers for each origin. CloudFront supports custom headers for custom origins and Amazon S3 origins.

You can use custom headers, such as the following examples:

Identifying requests from CloudFront

You can identify the requests that your origin receives from CloudFront. This can be useful if you want to know if users are bypassing CloudFront, or if you’re using more than one CDN and you want information about which requests are coming from each CDN.

Determining which requests come from a particular distribution

If you configure more than one CloudFront distribution to use the same origin, you can add different custom headers in each distribution. You can then use the logs from your origin to determine which requests came from which CloudFront distribution.

Enabling cross-origin resource sharing (CORS)

If some of your viewers don’t support cross-origin resource sharing (CORS), you can configure CloudFront to always add the Origin header to requests that it sends to your origin. Then you can configure your origin to return the Access-Control-Allow-Origin header for every request. You must also configure CloudFront to respect CORS settings.

Controlling access to content

You can use custom headers to control access to content. By configuring your origin to respond to requests only when they include a custom header that gets added by CloudFront, you prevent users from bypassing CloudFront and accessing your content directly on the origin. For more information, see Restrict access to files on custom origins.

To configure a distribution to add custom headers to requests that it sends to your origin, update the origin configuration using one of the following methods:

• CloudFront console – When you create or update a distribution, specify header names and values in the Add custom headers settings. For more information, see Add custom header.

• CloudFront API – For each origin that you want to add custom headers to, specify the header names and values in the CustomHeaders field inside Origin. For more information, see CreateDistribution or UpdateDistribution in the Amazon CloudFront API Reference.

If the header names and values that you specify are not already present in the viewer request, CloudFront adds them to the origin request. If a header is present, CloudFront overwrites the header value before forwarding the request to the origin.

For the quotas that apply to origin custom headers, see Quotas on headers.

You can’t configure CloudFront to add any of the following headers to requests that it sends to your origin:

• Cache-Control

• Connection

• Content-Length

• Cookie

• Host

• If-Match

• If-Modified-Since

• If-None-Match

• If-Range

• If-Unmodified-Since

• Max-Forwards

• Pragma

• Proxy-Authenticate

• Proxy-Authorization

• Proxy-Connection

• Range

• Request-Range

• TE

• Trailer

• Transfer-Encoding

• Upgrade

• Via

• Headers that begin with X-Amz-

• Headers that begin with X-Edge-

• X-Real-Ip

When CloudFront forwards a viewer request to your origin, CloudFront removes some viewer headers by default, including the Authorization header. To make sure that your origin always receives the Authorization header in origin requests, you have the following options:

• Add the Authorization header to the cache key using a cache policy. All headers in the cache key are automatically included in origin requests. For more information, see Control the cache key with a policy.

• Use an origin request policy that forwards all viewer headers to the origin. You cannot forward the Authorization header individually in an origin request policy, but when you forward all viewer headers CloudFront includes the Authorization header in viewer requests. CloudFront provides a managed origin request policy for this use case, called Managed-AllViewer. For more information, see Use managed origin request policies.

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