HTTP Headers Analysis for https://plaincode.nl

Detected Technologies from Headers

See all in URL Inspect 2

SvelteKit

Vercel

HTTP Security Headers

Status

Strict-Transport-Security

Present

max-age=63072000

Content-Security-Policy

Missing

Not configured Analyze

Content-Security-Policy-Report-Only

Missing

Not configured Analyze

X-Frame-Options

Missing

Not configured

X-Content-Type-Options

Missing

Not configured

Referrer-Policy

Missing

Not configured

Permissions-Policy

Missing

Not configured

Recommendations

• Increase HSTS max-age to at least 1 year and add includeSubDomains
• Add Content-Security-Policy header to prevent XSS attacks
• Add X-Frame-Options: DENY or SAMEORIGIN to prevent clickjacking
• Add X-Content-Type-Options: nosniff
• Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
• Consider adding Permissions-Policy to control browser features

Performance Headers

Connection

Performance

close

connection: close

Caching Headers

Age

Caching

0

Cache-Control

Caching

public, max-age=0, must-revalidate

Etag

Caching

"1wfhee4"

age: 0
cache-control: public, max-age=0, must-revalidate
etag: "1wfhee4"

Content Headers

Content-Length

Content

13852

Content-Type

Content

text/html

content-length: 13852
content-type: text/html

Server Headers

Server

Vercel

server: Vercel

CORS Headers

No CORS headers found

Cookies Headers

No cookies headers found

Other Headers

Date

Other

Tue, 24 Feb 2026 11:15:40 GMT

Link

Other

URL ./_app/immutable/assets/2.Po0PyXHU.css

rel=preload as=style nopush

URL ./_app/immutable/assets/4.4unHIdeq.css

rel=preload as=style nopush

URL ./_app/immutable/entry/start.7YXrxWGp.js

rel=modulepreload nopush

URL ./_app/immutable/chunks/entry.Ih0OfUMc.js

rel=modulepreload nopush

URL ./_app/immutable/assets/2.Po0PyXHU.css

rel=preload as=style nopush

URL ./_app/immutable/assets/4.4unHIdeq.css

rel=preload as=style nopush

URL ./_app/immutable/entry/start.7YXrxWGp.js

rel=modulepreload nopush

URL ./_app/immutable/chunks/entry.Ih0OfUMc.js

rel=modulepreload nopush

URL ./_app/immutable/chunks/scheduler.Ei81k1bk.js

rel=modulepreload nopush

URL ./_app/immutable/chunks/index.59JmzofH.js

rel=modulepreload nopush

URL ./_app/immutable/entry/app.rJ0nSDpQ.js

rel=modulepreload nopush

URL ./_app/immutable/chunks/index.bk_PJQIe.js

rel=modulepreload nopush

URL ./_app/immutable/nodes/0.WHb0hLTm.js

rel=modulepreload nopush

URL ./_app/immutable/nodes/2.RBkFUFBm.js

rel=modulepreload nopush

URL ./_app/immutable/chunks/Translate.orGNy7yT.js

rel=modulepreload nopush

URL ./_app/immutable/nodes/4.sme8l7nq.js

rel=modulepreload nopush

X-Sveltekit-Page

Other

true

X-Vercel-Cache

Other

MISS

X-Vercel-Id

Other

iad1::fra1::jtplx-1771931740077-eef9710fb7bf

date: Tue, 24 Feb 2026 11:15:40 GMT
link: <./_app/immutable/assets/2.Po0PyXHU.css>; rel="preload";as="style"; nopush, <./_app/immutable/assets/4.4unHIdeq.css>; rel="preload";as="style"; nopush, <./_app/immutable/entry/start.7YXrxWGp.js>; rel="modulepreload"; nopush, <./_app/immutable/chunks/entry.Ih0OfUMc.js>; rel="modulepreload"; nopush, <./_app/immutable/chunks/scheduler.Ei81k1bk.js>; rel="modulepreload"; nopush, <./_app/immutable/chunks/index.59JmzofH.js>; rel="modulepreload"; nopush, <./_app/immutable/entry/app.rJ0nSDpQ.js>; rel="modulepreload"; nopush, <./_app/immutable/chunks/index.bk_PJQIe.js>; rel="modulepreload"; nopush, <./_app/immutable/nodes/0.WHb0hLTm.js>; rel="modulepreload"; nopush, <./_app/immutable/nodes/2.RBkFUFBm.js>; rel="modulepreload"; nopush, <./_app/immutable/chunks/Translate.orGNy7yT.js>; rel="modulepreload"; nopush, <./_app/immutable/nodes/4.sme8l7nq.js>; rel="modulepreload"; nopush
x-sveltekit-page: true
x-vercel-cache: MISS
x-vercel-id: iad1::fra1::jtplx-1771931740077-eef9710fb7bf

Recommendations

Enable compression (gzip/brotli) to improve performance