Implemented Res.Type() Initial Logic to Specify Content-Type HTTP Response Header.

[muhammadzkralla]

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[Copilot]

Pull Request Overview

Introduces the Type method on Res to derive and store a MIME type from various inputs, and adds corresponding table-driven tests.

• Adds Res.Type(string) *Res to normalize extensions or full MIME types into res.ContentType.
• Introduces TestContentType to validate common mappings (json, html, text, xml, csv, image formats).

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
response.go	Implements Res.Type method with extension lookup and fallback logic.
response_test.go	Adds TestContentType to verify Type normalization across inputs.

Comments suppressed due to low confidence (2)

response.go:265

• The comment says the header is set, but the method only updates res.ContentType. Either update the doc to reflect the actual behavior or have the method also write to res.Headers["Content-Type"].

// Sets the `Content-Type` HTTP response header to the MIME type specified

response_test.go:323

• Tests verify res.ContentType but don't assert that the Headers map is updated. Add an assertion on res.Headers["Content-Type"] to cover header-writing behavior.

if res.ContentType != tt.expected {