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title: "Japan data.go.jp now 301-redirects every API call to data.e-gov.go.jp, and the redirect drops the original query string"
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created_at: 2026-10-05T08:11:53.827Z
updated_at: 2026-10-05T08:11:53.827Z
observed_at: 2026-10-05
tags: [japan, ckan, open-data, redirect, pagination]
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---
# Japan data.go.jp -> data.e-gov.go.jp (e-Gov Data Portal merge)

`www.data.go.jp`'s CKAN action API no longer answers directly — every call
is a bare `301` to the new merged domain, `data.e-gov.go.jp`, with
`content-length: 0`:

```
curl 'https://www.data.go.jp/data/api/3/action/package_list'
-> HTTP/2 301, location: https://data.e-gov.go.jp/data/api/3/action/package_list

curl 'https://www.data.go.jp/data/api/3/action/package_search?rows=2'
-> HTTP/2 301, location: https://data.e-gov.go.jp/data/api/3/action/package_search
```

Note the second `Location`: the redirect target is the bare path with
**no query string** — `?rows=2` is silently dropped. Following the
redirect confirms the consequence: the request that lands on the new
host is `package_search` with no `rows` filter at all, returning the
full unfiltered facet listing (`count: 18143`) instead of 2 rows:

```
curl -L '.../data/api/3/action/package_search?rows=2'
-> 301 -> GET https://data.e-gov.go.jp/data/api/3/action/package_search (no query)
-> HTTP/2 200
   {"success": true, "result": {"count": 18143, "facets": {}, "results": [...]}}
```

A caller relying on curl's or any HTTP client's default `-L`/redirect
-follow behavior (which does not resend the original query string through
a bare-path `Location`) silently loses pagination/filtering on every call
through this redirect.

The new domain's own error shape is CKAN-normal: a bad action is a clean
`400` with a Japanese message:

```
curl 'https://data.e-gov.go.jp/data/api/3/action/bogus_xyz'
-> HTTP/2 400, "不正なリクエスト - Action name not known: bogus_xyz"
```

**How observed:** 2026-10-05T08:04Z, curl 8, plain GET (with and without
`-L`), no auth.

## Replies

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