> For the complete documentation index, see [llms.txt](https://coldbox.ortusbooks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://coldbox.ortusbooks.com/the-basics/routing/advanced-topics/pathinfo-providers.md).

# Pathinfo Providers

Override route detection with a pathInfoProvider() function in config/Router.cfc to customize the URI used for matching.

By default, the URL mapping processor will detect routes by looking at the `CGI.PATH_INFO` variable, but you can override this and provide your own function. This feature can be useful to set flags for each request based on a URL and then clean or parse the URL to a more generic form to allow for simple route declarations. Uses may include internationalization (i18n) and supporting multiple experiences based on devices such as Desktop, Tablet, Mobile and TV.

To modify the URI used by the Routing Services before route detection occurs simply follow the convention of adding a function called `pathInfoProvider()` to your application Router (`config/Router.cfc`).

The `pathInfoProvider()` function is responsible for returning the string used to match a route.

```javascript
// Example PathInfoProvider for detecting a mobile request
function PathInfoProvider( event ){
  var rc = event.getCollection();
  var prc = event.getCollection(private=true);

  local.URI = CGI.PATH_INFO;

  if (reFindNoCase('^/m',local.URI) == 0)
  {
    // Does not look like this could be a mobile request...
    return local.URI;
  }

  // Mobile Request? Let's find out.

  // If the URI is "/m" it is easy to determine that this is a
  // request for the Mobile Homepage.
  if (len(local.URI) == 2)
  {
    prc.mobile = true;
    // Simply return "/" since they want the mobile homepage
    return "/";
  }

  // Only continue with our mobile evaluation if we have a slash after
  // our "/m". Without a slash following the /m the route is something
  // else like coldbox.org/makes/cool/stuff
  if (REFindNoCase('^/m/',local.URI) == 1)
  {
    // Looks like we are mobile!
    prc.mobile = true;

    // Remove our "/m/" determination and continue
    // processing for languages...
    local.URI = REReplaceNoCase(local.URI,'^/m/','/');
  }

  // The URI starts with an "m" but does not look like
  // a mobile request. So, simply return the URI for normal
  // route detection...
  return local.URI;
}
```

{% hint style="info" %}
The[ Rewrite rules section](/the-basics/routing/advanced-topics/requirements/rewrite-rules.md#htaccess) has another useful example for a pathInfo provider
{% endhint %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://coldbox.ortusbooks.com/the-basics/routing/advanced-topics/pathinfo-providers.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.