Individual skill

mime-type

Use when auditing server configuration or diagnosing broken resources. Applies to any web server serving HTML, CSS, JS, images, fonts, or other static assets.

skills/mime-type/SKILL.md

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Observed behavior: Network or broad shell
Last checked: Nov 9, 2026

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Repository stars (not skill ratings): 74,696
Repository last updated: Oct 31, 2026
License: MIT

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frontend Repository topic
front-end-development Repository topic
front-end-developer-tool Repository topic
guidelines Repository topic
checklist Repository topic
reference Repository topic
web-development Repository topic
html Repository topic
css Repository topic
javascript Repository topic
engineering Derived category

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SKILL.mdcore · 2,205 bytes
references/rule.mddoc · 4,183 bytes

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# MIME Type Validation

Incorrect MIME types cause browsers to block stylesheets and scripts (MIME sniffing is disabled by X-Content-Type-Options: nosniff), breaking page rendering and signalling poor site quality to crawlers.

## Quick Reference

- The Content-Type header must match the actual file type being served
- HTML pages must be served as text/html; charset=utf-8
- CSS files must be served as text/css and JavaScript as text/javascript
- Incorrect MIME types cause browsers to block or mishandle resources

## Check

For key pages and their linked resources, inspect the HTTP Content-Type response header. Verify HTML responses use text/html; charset=utf-8, CSS uses text/css, JS uses text/javascript, and images use image/jpeg, image/png, etc.