> For the complete documentation index, see [llms.txt](https://neomatrixcode.gitbook.io/merly/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://neomatrixcode.gitbook.io/merly/guide/custom-404-handler.md).
# Custom 404 Handler
It is possible to return a personalized message when a route cannot be found.
## notfound
The notfound method allows you to customize the response of the 404 error code, it is possible to pass the html code in string format to the method.
```julia
notfound("""
Not found
404, Not found
""")
```
It is also possible to pass a path that includes the name of the html file to use. The path will start from the directory where the program is located or from the path specified as a base.
```julia
notfound("folder/notfound.html")
```