URL: /rules/content/mime-type

---
title: "MIME Type Validation"
description: "Detects Content-Type header mismatches with file extensions"
---

Detects Content-Type header mismatches with file extensions

| | |
|---|---|
| **Rule ID** | `content/mime-type` |
| **Category** | [Content](/rules/content) |
| **Scope** | Per-page |
| **Severity** | warning |
| **Weight** | 5/10 |

## Solution

Incorrect MIME types break resource loading and waste crawl budget. Common issues include .js files served as text/html, images without image/* type, CSS without text/css. Fix server configuration to serve correct Content-Type headers. For Apache use .htaccess, for nginx use mime.types config.

## Enable / Disable

### Disable this rule

```toml squirrel.toml
[rules]
disable = ["content/mime-type"]
```

### Disable all Content rules

```toml squirrel.toml
[rules]
disable = ["content/*"]
```

### Enable only this rule

```toml squirrel.toml
[rules]
enable = ["content/mime-type"]
disable = ["*"]
```