---
title: Proxy transformations
description: Proxy transformations are used to rewrite requests and responses as they pass through the PingDirectoryProxy server. Proxy data transformations are helpful for clients that use an old schema or that contain a hard-coded schema.
component: pingdirectory
version: 11.0
page_id: pingdirectory:pingdirectoryproxy_server_administration_guide:pd_proxy_transformations
canonical_url: https://docs.pingidentity.com/pingdirectory/11.0/pingdirectoryproxy_server_administration_guide/pd_proxy_transformations.html
revdate: April 25, 2024
---

# Proxy transformations

Proxy transformations are used to rewrite requests and responses as they pass through the PingDirectoryProxy server. Proxy data transformations are helpful for clients that use an old schema or that contain a hard-coded schema.

Use the PingDirectoryProxy server proxy transformations to:

* Provide a distinghuished name (DN) and attribute mapping *(tooltip: \<div class="paragraph">
  \<p>Matching corresponding attributes between an IdP and an SP to identify federated users or add supplemental user information.\</p>
  \</div>)* altering both requests to the server as well as responses from the server.

  For example, a client sends a request to `o=example.com` even though the directory server handling the request uses `dc=example,dc=com`. The PingDirectoryProxy server can transparently remap the request so that the server can process it and map it back to the original DN of the client request when the value is returned.

* Alternatively, if a client tries to use the attribute `userID`, the PingDirectoryProxy server can map it to `uid` before sending the request on to the backend LDAP server. The PingDirectoryProxy server then remaps the response to `userID` when the value is returned.

* Suppress a specified attribute so that it is never returned to clients. Also, it can cause the server to reject requests which target that particular attribute.

* Prevent entries that match a given search filter from being returned to clients.

For more information about configuring proxy transformations, see [Configuring proxy transformations](pd_proxy_config_proxy_transformations.html).