> Application Request Routing is Microsoft's IIS extension for load balancing and reverse proxy: learn about its ARRAffinity cookie and GDPR. > > Canonical: https://www.flowconsent.com/en/services/hosting/application-request-routing Hosting # Application Request Routing Essential · [Official website](https://www.iis.net/downloads/microsoft/application-request-routing) Application Request Routing (ARR) is a Microsoft extension for IIS that routes HTTP requests between web servers. It provides reverse proxy, load balancing, URL rewriting rules and caching for sites hosted on Windows. To send a visitor back to the same server, it can set a session affinity cookie named ARRAffinity, which is generally treated as technically necessary. [Block Application Request Routing until consent](https://app.flowconsent.com/auth/sign-up?utm_source=flowconsent.com\&utm_medium=referral\&utm_campaign=hosting) · [Scan my site](https://www.flowconsent.com/en/scan) At a glance - Category [Hosting](https://www.flowconsent.com/en/services/hosting) - Consent Essential - Prior consent Required - Documented cookies 0 Compliance ## Application Request Routing and the GDPR Application Request Routing is classified as “Essential”. On a site that targets European visitors, it must only load after the visitor consents, and it must be listed in your cookie policy. Cookies and trackers ## What Application Request Routing sets and contacts The cookies of Application Request Routing are not documented in the catalog yet. To see what is actually set on your site, run a free scan. 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