Cache Poisoning DoS on updates.rockstargames.com

In this report, the researcher discovered that there was a cache poisoning weakness on `updates.rockstargames.com` due to an unkeyed header, `trailer`. By sending this header, an attacker could cause the cache to save a malformed response with status code 400. An example of such a request, as provided by the researcher: ``` GET /patches/gtaiv/notes_title_update_6/GTAIVPC_TU6_Patch_Notes_FR.txt?donotpoisoneveryone=1 HTTP/1.1 Host: updates.rockstargames.com trailer: 1 ``` To resolve this issue, our team worked together with our CDN provider. The host no longer returns/saves a 400-code response when this header is sent in a request, and legitimate users can no longer be denied access to this content.