<!-- Add the related story/sub-task/bug number, like Resolves #123, or remove if NA --> **Related issues:** - Prevents unbounded split length exploits similar to https://nvd.nist.gov/vuln/detail/CVE-2025-30204 - Also removes parsing of request body for token, see https://github.com/fleetdm/fleet/issues/39659 - @iansltx I figured since this PR updates the code blocks in question, makes sense to [remove the body parsing here](https://github.com/fleetdm/fleet/pull/39427/changes#diff-83b0d73af21e81cf2c5ed4448718d0760543699fe6e36e401372467befea29edL30-L33), and clean up the [related dead code](https://github.com/fleetdm/fleet/blob/c1e3e89b5fd1986f87b5ac227ae85dbdea18f074/frontend/services/entities/installers.ts#L13) in a follow-up See https://fleetdm.slack.com/archives/C019WG4GH0A/p1770322925865209 - [x] Added/updated automated tests - [x] QA'd all new/changed functionality manually