---
title: "Reference: Feature Flags"
manual: "Headless"
version: "main"
permalink: "https://docs.typo3.org/permalink/friendsoftypo3/headless:ref-feature-flags@main"
source: "Reference/FeatureFlags.rst"
rendered: "2026-10-14T09:29:03+00:00"
---

# Reference: Feature Flags {#ref-feature-flags}

Quick lookup. For per-flag descriptions and usage see
[Configuration](https://docs.typo3.org/permalink/friendsoftypo3/headless:configuration@main).

## Active in 5.x {#active-in-5-x}

| Flag | Effect |
| --- | --- |
| `headless.storageProxy` | Route processed file URLs through `frontendFileApi`. |
| `headless.elementBodyResponse` | On POST/PUT/DELETE, return just the element matching `responseElementId` from the body. |
| \`headless.overrideFluidTemplates | Swap `ViewFactoryInterface` for `HeadlessViewFactory`. Required to render raw-PHP templates per view. |
| `headless.cookieDomainPerSite` | Per-site `cookieDomain` injection middleware. |
| `headless.assetsCacheBusting` | Append `?<mtime>` to processed-file URLs. |
| `headless.prettyPrint` | `JSON_PRETTY_PRINT` on every encoder output. |

## Availability by version {#availability-by-version}

| Flag | 2.x | 3.x | 4.x | 5.x |
| --- | --- | --- | --- | --- |
| FrontendBaseUrlInPagePreview | available | removed | removed | removed |
| headless.frontendUrls | >= 2.5 | available | removed | removed |
| headless.storageProxy | >= 2.4 | available | available | available |
| headless.redirectMiddlewares | >= 2.5 | available | available | removed (auto-on when EXT:redirects is installed) |
| headless.nextMajor | >= 2.2 | currently not used | currently not used | removed |
| headless.elementBodyResponse | >= 2.6 | available | available | available |
| headless.simplifiedLinkTarget | >= 2.6 | removed | not available | not available |
| headless.jsonViewModule | not available | >= 3.0 | >= 3.0 | removed (module discontinued) |
| headless.workspaces | not available | >= 3.1 | removed (auto-on with EXT:workspaces) | removed (works without a flag) |
| headless.pageTitleProviders | not available | not available | >= 4.2.3 <= 4.4 | removed |
| headless.overrideFluidTemplates | not available | not available | available | available (reworked, see UPGRADE.md) |
| headless.cookieDomainPerSite | not available | not available | available | available |
| headless.assetsCacheBusting | not available | not available | available | available |
| headless.prettyPrint | not available | not available | available | available |