# Correcting Request URLs with Python Serverless Functions

**Published:** February 2, 2021 | **Authors:** Nathan Rajlich

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At the moment, the URLs of incoming requests to Python Serverless Functions deployed on Vercel are decoded automatically.

Because this behavior is not consistent with a "standalone" Python server, Vercel will stop decoding them for newly created Serverless Functions starting **March 2nd, 2021**. Existing Deployments will not be affected.

As an example, take a look at the Python Serverless Function code shown above and imagine that the URL of the incoming request ends in `/hi%21`:

- With the incorrect behavior, `self.path` will be set to `/hi!`.
- With the updated correct behavior, `self.path` will be set to `/hi%21`, which matches the behavior of the built-in `HTTPServer` class in Python.

To try out this change, define a `FORCE_RUNTIME_TAG` Environment Variable for your project, set it to `canary` and create a new Deployment.

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