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radicle-explorer/explorer/docs/api-changes.md
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Daniel Norman e1f7a40c63 httpd: Set up the tag release flow
- Rename RADICLE_VERSION to RADICLE_HTTPD_VERSION, apart from
  heartwood's RADICLE_VERSION
- Add Unreleased sections to the changelog and API changes log, so
  patches add their highlights as they land
- Replace the release patch with a signed tag that one delegate
  pushes
- Stop pushing the tag from upload: the delegate who makes the tag
  pushes it
- Remove build/changelog
- Add build/prepare to rename the Unreleased sections, in POSIX sh
  and awk
- Ask a major release to set the target date to drop the previous
  major
- Fix the signing key setup: use the bare key that build/tag
  compares against
2026-10-29 18:32:03 +01:00

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# httpd API changes
Breaking changes to the httpd API that are between expand and contract.
[ADR 0001](adr/0001-expand-and-contract-api-changes.md) has the rules.
- When a change expands, add a section under `## Unreleased`, and add its
removals to the table.
- When a release ships, build/prepare renames `## Unreleased` to its version.
When the release bumps the major, add a target date to drop the previous major
in `## Support`. Its `## API changes` notes come from its sections and from
the server removals.
- When code is removed, delete its row. When a change has no rows left, delete
its section.
## Support
Explorer supports httpd 0.28.0 and newer, set by `minimumSupportedVersion` in
`http-client/lib/compat.ts`. No target dates are set yet.
## Removals
| When | Side | Change | Remove |
| ------------------------- | ------ | --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Explorer drops httpd 0.26 | Client | Stats endpoints | `getCommitCountBySha` and `getDiffStats` in `http-client/lib/repo.ts` |
| Explorer drops httpd 0.30 | Client | API at `/api` | `/api/v1` in `http-client/lib/fetcher.ts`, `apiBase` in `workers/open-graph/index.js`, and in the tests under `tests/visual/desktop/` and `tests/e2e/` |
| Explorer drops httpd 0.30 | Client | Repo facts | `legacyMetaSchema`, `crefsPayloadSchema` and `legacyRepoFields` in `http-client/lib/compat.ts`; `normalizeRepo` in `workers/open-graph/index.js` |
| Explorer drops httpd 0.30 | Client | Release scope | `legacyReleasesQuery`, `legacyScopeReleases` and `legacyHasOtherReleases` in `http-client/lib/compat.ts` |
| Explorer drops httpd 0.30 | Client | Release support | `releasesSupported` in `http-client/lib/compat.ts` |
| Major after client switch | Server | API at `/api` | The `/v1` nest in `crates/radicle-httpd/src/api.rs` |
| A major release | Server | Repo facts | Legacy `meta` and `head` in `crates/radicle-httpd/src/api.rs` |
| A major release | Server | Release scope | `allAuthors` in `crates/radicle-httpd/src/api/query.rs` |
## Unreleased
### API at `/api`
- Added: httpd serves the API at `/api`, and still at `/api/v1`.
- Changed in place: the API root reports `path` as `/api`. The old index at
`/api`, which only linked to `/v1`, is gone. No client reads either.
- Read by: client, Open Graph worker. Both call `/api/v1` until explorer drops
httpd 0.30, because older httpd serves only that path. So httpd keeps `/v1`
until the first major release after they switch.
### Repo facts
- Added: `cobs`, with the release buckets, and a qualified `defaultBranch`,
outside the project payload. The legacy `meta` (counts and `head`) stays
inside it.
- Changed in place: `meta.releases` counts `delegate` plus `other`, not every
release object. When httpd cannot count, it leaves the field out instead of
sending 0. Older clients parse both, because the field was always optional.
- Changed in place: only `repos/:rid` sends the release buckets and
`meta.releases`. Repo lists leave both out, because counting reads every
release of each repo.
- Read by: client, Open Graph worker.
### Release scope
- Added: the releases query takes `scope` (`trusted` or `untrusted`).
`allAuthors` stays.
- Read by: client.
### Release support
- Added: `/info` reports `httpd.releases`, whether httpd was built with release
support. Without it, a repo with no release count could be a node without
releases or a count that failed.
- Read by: client. On older httpd, it reads a release count as support.
### Version
- Removed: `apiVersion` in the API root. The client no longer checks it, and
released clients do not read it.
- Added: the client reads `version` in the API root, and warns on nodes older
than `minimumSupportedVersion`.
- This is a removal, so the release bumps the major.
## 0.27.0
### Stats endpoints
- Added: `stats/commits/:sha` and `diff/:base/:oid/stats`. The client falls back
to the tree stats and the full diff.
- Read by: client.