# Routing traffic to different backends

In Transparent CDN, it is possible to have a **"multi-origin"** configuration, where objects can be retrieved from different backends based on any element present in the request made by the browser to Transparent CDN.

A typical use case could be to switch origins based on the URL, so that, as shown in the example, everything that arrives at <https://www.transparentcdn.com/blog> goes to the backend c83\_tcdn\_blog, which has been previously [set up.](/getting-started/dashboard/auto-provisioning/backends.md)

```javascript
sub vcl_recv{
  if (req.http.host == "www.transparentcdn..com"){ 
    set req.backend_hint = c83_tcdn.backend();
  } 
  if ((req.http.host == "www.transparentcdn.com") && (bereq.url ~ "/blog")) {
    set req.backend_hint = c83_tcdn_blog.backend();
  }
}
```

The same logic presented here can be used to switch backends based on, as mentioned, any other element present in the request, such as a cookie or any other header.


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# Agent Instructions: Querying This Documentation

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

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.transparentedge.eu/guides/enrutando-el-trafico-a-distintos-backend.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.