> For the complete documentation index, see [llms.txt](https://docs.disasm.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.disasm.dev/incapsula/utmvc.md).
# UTMVC
The UTMVC challenge is a legacy challenge and is often no longer required, but some sites do still use it.
## How do I know if I need to solve UTMVC?
If you try to access a protected site, the server may return this block page:
```html
```
If you see this, you usually need to solve UTMVC.
## How do I solve the challenge?
1. Perform a GET request to the script `src` in the block page.
* Here it is `/_Incapsula_Resource?SWJIYLWA=5074a744e2e3d891814e9a2dace20bd4,719d34d31c8e3a6e6fffd425f7e032f3`, but it will be different for you, so parse it from the page.
2. The GET returns an obfuscated JavaScript challenge script. Base64-encode the response and send it as the `script` parameter to our API (see the [API Reference](/incapsula/api-reference.md)).
3. The API returns a JSON object with two values: `___utmvc` and `SWHANEDL`.
4. If `SWHANEDL` has a value, make a GET request to `/_Incapsula_Resource?SWHANEDL=` followed by the value returned from the API.
5. Add the `___utmvc` cookie to your requests.
6. Perform a GET request to `/_Incapsula_Resource?SWKMTFSR=1&e=0.47671500400673494`. Replace `0.47671500400673494` with a random value below 1 with 15 decimal places - in JavaScript, `Math.random()` does this.
7. If the `___utmvc` cookie was accepted, the response body contains `1`.
8. Retry the original blocked request; it should now succeed. The screenshot below shows an example of the request sequence.
---
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