[Snyk] Security upgrade rack from 1.6.4 to 3.0.0

[ryanmcmorrowsnyk]

Snyk has created this PR to fix 1 vulnerabilities in the rubygems dependencies of this project.

Snyk changed the following file(s):

• Gemfile
• Gemfile.lock

Breaking Change Assessment! <- Click to expand>.

Breaking Change Assessment: High 🔴
This upgrade from Rack v1.6 to v3.0 spans two major versions with significant breaking changes to the core Rack specification, middleware, and server handlers. Direct upgrade without code modification is not possible.

Actionable Items:

• SPEC Compliance: The Rack 3 SPEC requires changes to how responses are handled. Response status must be an integer, headers must be a non-frozen hash with lowercase keys, and the response body may be a streaming object.
• Middleware & Handlers: Several built-in handlers (FCGI, SCGI, Thin) and `rackup` itself have been removed or extracted into separate gems. If your application relies on these, you must add the new gems to your Gemfile.

Source: Rack Changelog
Recommendation: This is a major refactoring effort. Review the official Rack 3 Upgrade Guide and changelogs to address the extensive API and specification changes before merging.

Privacy Note 🤖: This is an AI summary generated using only our own internal data. No customer data is ever used in this process.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Web Cache Poisoning SNYK-RUBY-RACK-1061917	188

---

Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

---

Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs.

For more information:
🧐 View latest project report
📜 Customise PR templates
🛠 Adjust project settings
📚 Read about Snyk's upgrade logic

---

Learn how to fix vulnerabilities with free interactive lessons:

🦉 Learn about vulnerability in an interactive lesson of Snyk Learn.