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You can configure CloudFront to return a specific object (the default root object) when an end user requests the root URL for your distribution instead of an object in your distribution. Specifying a default root object avoids exposing the contents of your distribution.
For example, the following request points to the object
The following request points to the root URL of the same distribution instead of to a specific object:
When you define a default root object, an end-user request that calls the root of your distribution returns the default
root object. For example, if you designate the file
index.html as your default root object,
a request for:
However, if you define a default root object, an end-user request for a subdirectory of your distribution
does not return the default root object. For example, suppose
index.html is your default root object and
that CloudFront receives an end-user request for the
install directory under your CloudFront distribution:
CloudFront will not return the default root object even if a copy of
index.html appears in the
The behavior of CloudFront default root objects is different from the behavior of Amazon S3 index documents. When you configure an Amazon S3 bucket as a website and specify the index document, Amazon S3 returns the index document even if a user requests a subdirectory in the bucket. (A copy of the index document must appear in every subdirectory.) For more information about configuring Amazon S3 buckets as websites and about index documents, see the Hosting Websites on Amazon S3 chapter in the Amazon Simple Storage Service Developer Guide.
Remember that a default root object applies only to your CloudFront distribution. You still need to manage security for your origin. For example, if you are using an Amazon S3 origin, you still need to set your Amazon S3 bucket ACLs appropriately to ensure the level of access you want on your bucket.
If you don't define a default root object, requests for the root of your distribution pass to your origin server. If you are using an Amazon S3 origin, any of the following might be returned:
A list of the contents of your Amazon S3 bucket—Under any of the following conditions, the contents of your origin are visible to anyone who uses CloudFront to access your distribution:
Your bucket is not properly configured.
The Amazon S3 permissions on the bucket associated with your distribution and on the objects in the bucket grant access to everyone.
An end user accesses your origin using your origin root URL.
A list of the private contents of your origin—If you configure your origin as a private distribution (only you and CloudFront have access), the contents of the Amazon S3 bucket associated with your distribution are visible to anyone who has the credentials to access your distribution through CloudFront. In this case, users are not able to access your content through your origin root URL. For more information about distributing private content, see Serving Private Content through CloudFront.
Error 403 Forbidden—CloudFront returns this error if the permissions on the Amazon S3 bucket associated with your distribution or the permissions on the objects in that bucket deny access to CloudFront and to everyone.
To avoid exposing the contents of your download distribution or returning an error, perform the following procedure to specify a default root object for your distribution.
To specify a default root object for your distribution
Upload the default root object to the origin that your distribution points to.
The file can be any type supported by CloudFront. For a list of constraints on the file name, see the description of the
DefaultRootObject element in
DistributionConfig Complex Type.
If the file name of the default root object is too long or contains an invalid character, CloudFront returns the error
HTTP 400 Bad Request - InvalidDefaultRootObject. In addition, CloudFront caches the code for five minutes and
writes the results to the access logs.
Confirm that the permissions for the object grant CloudFront at least
For more information about Amazon S3 permissions, see Access Control in the Amazon Simple Storage Service Developer Guide. For information on using the Amazon S3 console to update permissions, go to the Amazon Simple Storage Service Console User Guide.
Update your distribution to refer to the default root object using the CloudFront console or the CloudFront API.
To specify a default root object using the CloudFront console:
Sign in to the AWS Management Console and open the Amazon CloudFront console at https://console.aws.amazon.com/cloudfront/.
In the list of distributions in the top pane, select the distribution to update.
In the Distribution Details pane, on the General tab, click Edit.
In the Edit Distribution dialog box, in the Default Root Object field, enter the file name of the default root object.
To save your changes, click Yes, Edit.
To update your configuration using the CloudFront API, you specify a value for the
element in your distribution. For information about using the CloudFront API to specify a default root object, see
PUT Distribution Config in the Amazon CloudFront API Reference.
Confirm that you have enabled the default root object by requesting your root URL. If your browser doesn't display the default root object, perform the following steps:
Confirm that your distribution is fully deployed by viewing the status of your distribution in the CloudFront console.
Repeat Steps 2 and 3 to verify that you granted the correct permissions and that you correctly updated the configuration of your distribution to specify the default root object.