HTTP Headers Analysis for https://developers.r25.jp

Detected Technologies from Headers

See all in URL Inspect 2

AWS CloudFront

Envoy

HTTP Security Headers

Status

Strict-Transport-Security

Missing

Not configured

Content-Security-Policy

Missing

Not configured Analyze

Content-Security-Policy-Report-Only

Missing

Not configured Analyze

X-Frame-Options

Excellent

DENY

X-Content-Type-Options

Good

nosniff

Referrer-Policy

Missing

Not configured

Permissions-Policy

Missing

Not configured

Recommendations

• Add Strict-Transport-Security header with max-age of at least 1 year
• Add Content-Security-Policy header to prevent XSS attacks
• Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
• Consider adding Permissions-Policy to control browser features

Performance Headers

Connection

Performance

close

Transfer-Encoding

Performance

chunked

Vary

Performance

Accept-Encoding

connection: close
transfer-encoding: chunked
vary: Accept-Encoding

Caching Headers

Cache-Control

Caching

private, no-cache, no-store, max-age=0, must-revalidate

cache-control: private, no-cache, no-store, max-age=0, must-revalidate

Content Headers

Content-Type

Content

text/html; charset=utf-8

content-type: text/html; charset=utf-8

Server Headers

Server

istio-envoy

server: istio-envoy

CORS Headers

No CORS headers found

Cookies Headers

Set-Cookie

Cookies

set-cookie: NEXT_LOCALE=ja; Path=/; Expires=Tue, 18 May 2027 04:14:25 GMT; Max-Age=31536000; SameSite=lax

Other Headers

Date

Other

Mon, 18 May 2026 04:14:25 GMT

Link

Other

URL /_next/static/media/24f6ebe2756575bd-s.p.woff2

rel=preload as=font crossorigin type=font/woff2

URL /_next/static/media/b957ea75a84b6ea7-s.p.woff2

rel=preload as=font crossorigin type=font/woff2

Via

Other

1.1 a035f6df76b0fcf3f3f167c837fad7ee.cloudfront.net (CloudFront)

X-Amz-Cf-Id

Other

KvN0Es08X8GXi_gzZNDww6XXZfruZhU0W2TBm77UbN3GGNl55ikOqw==

X-Amz-Cf-Pop

Other

IAD89-P3

X-Cache

Other

Miss from cloudfront

X-Envoy-Upstream-Service-Time

Other

43

X-Middleware-Rewrite

Other

/ja/welcome

date: Mon, 18 May 2026 04:14:25 GMT
link: </_next/static/media/24f6ebe2756575bd-s.p.woff2>; rel=preload; as="font"; crossorigin=""; type="font/woff2", </_next/static/media/b957ea75a84b6ea7-s.p.woff2>; rel=preload; as="font"; crossorigin=""; type="font/woff2"
via: 1.1 a035f6df76b0fcf3f3f167c837fad7ee.cloudfront.net (CloudFront)
x-amz-cf-id: KvN0Es08X8GXi_gzZNDww6XXZfruZhU0W2TBm77UbN3GGNl55ikOqw==
x-amz-cf-pop: IAD89-P3
x-cache: Miss from cloudfront
x-envoy-upstream-service-time: 43
x-middleware-rewrite: /ja/welcome

Recommendations

Enable compression (gzip/brotli) to improve performance