Introduction to AWS S3 Routing Rules

Amazon S3 (Simple Storage Service) is one of the most popular services offered by AWS (Amazon Web Services), providing scalable object storage primarily used for backup, archiving, and big data analytics. A powerful feature of S3 is static website hosting, where you can assign routing rules to manage how incoming requests are processed. The S3 RoutingRule is particularly useful for managing redirects and conditionally rewriting object paths, enhancing the usability of your static website hosted on S3.

Understanding S3 Routing Rules

Amazon S3 RoutingRules allow you to redirect requests to another object or URL depending on specific conditions. They are defined inside the RoutingRules element of a bucket's website configuration.

Key Features of S3 Routing Rules

• Redirect to a different domain or within the same bucket: You can set up redirects that point to objects within the same bucket or to a completely different domain.
• Conditional requests: RoutingRules can operate based on multiple conditions like HTTP error codes or the prefix of the request object key.
• Operations on query strings: You can specify whether query strings should be forwarded to the destination URL or altered.

Defining a Routing Rule with Wildcards

A wildcard condition allows for greater flexibility in request redirection. Typically, wildcards are used to match object keys and rearrange them into a new format or simplify URL handling. For instance, you may want to redirect requests for any *.html file in a particular directory to a single file.

Technical Explanation

When defining a RoutingRule, the wildcard character * can be utilized in the prefix condition. Let's look at a specific example:

• The Condition checks if object keys start with app/ followed by any sequence of characters, indicated by *.
• If the condition is satisfied, the specified objects are redirected, replacing the prefix app/ with application/.