# URL Filter

An URL filter excludes certain URL types from execution.

URLs can be filtered out based on a number of criteria, which can be used together or separately as needed:

^ Filer ^ Description ^ Comment ^
| Binary Data | Non-[ASCII](/glossary/a/ascii) content data with a `200 (ok)` [status code](/glossary/h/http_code). | This will strip away all images and other kinds of binary data. |
| CSS, JS (HTML Only) | Text/[ASCII](/glossary/a/ascii) data not in HTML format with a `200 (ok)` [status code](/glossary/h/http_code). | This will strip away [CSS](/glossary/c/css) and JavaScript files. |
| Cached Data (304) | Browser-side cached URLs received with a `304 (found)` [status code](/glossary/h/http_code).  | Recommended. |
| Errors | All errors [status code](/glossary/h/http_code) `400` and above, and all URLs with an incomplete response. | If not enabled, a reported error will count as a successful connection. |
| Host | [Hostname](/glossary/h/hostname) exclusion/inclusion filtering. |  |


## Hostname Exclusion/Inclusion

Host filtering can be used to exclude and/or include traffic from particular [hostnames](/glossary/h/hostname).

The filter can consist of a list of hostnames, separated by comma.

You can also explicitly exclude hosts by adding `!` before the hostname.

### Examples

```
www.example.com,media.example.com
```

All traffic *not* from `www.example.com` or `media.example.com` will be excluded.


```
!media.example.com
```

Traffic from `media.example.com` will be excluded.