sleeper.com

Readiness by lane

Green: sleeper.com. Thin bar: Sports Broadcast & Fantasy Games peer median.

Priority fixes for sleeper.com

Ordered by impact and by how common each practice is among peers.

1. Priority 1 · Harden

   HSTS kept for at least a year

   Observed: Strict-Transport-Security was sent with a max-age of 182 days, below the one-year benchmark.

   Why it matters: HSTS tells browsers to use HTTPS for your host on every later visit, which removes the window where a first HTTP request can be intercepted.

   What to do: Send Strict-Transport-Security on HTTPS responses. Start with a short max-age (for example 300 seconds), confirm every subdomain works over HTTPS, then raise it in steps to 31536000. Add includeSubDomains only when all subdomains are HTTPS. HSTS preload is optional and hard to undo; hstspreload.org itself does not recommend it by default.

   On Cloudflare: Enable HSTS under SSL/TLS > Edge Certificates > HTTP Strict Transport Security and raise max-age gradually.

   27% of Sports Broadcast & Fantasy Games peers do this. Limit: Read from the homepage response only; other pages or regions may send different headers.

   Guide: HTTPS and TLS Guide for Website Owners

2. Priority 2 · Accelerate

   No render-blocking scripts in <head>

   Observed: The homepage <head> loaded 1 external script without async or defer.

   What to do: Add defer to scripts that need the DOM, async to independent ones such as analytics, or move them to the end of the body.

   On Next.js: Use the next/script component with an appropriate loading strategy.

   43% of Sports Broadcast & Fantasy Games peers do this.

   Guide: Control Third-Party Scripts Before They Control Your Page

3. Priority 3 · Accelerate

   HTTP/3 advertised

   Observed: The homepage did not advertise HTTP/3 through an Alt-Svc header.

   What to do: Turn on HTTP/3 at your CDN. Browsers fall back to HTTP/2 automatically, so the risk is low.

   On Cloudflare: Enable HTTP/3 (with QUIC) under Speed > Optimization > Protocol Optimization.

   34% of Sports Broadcast & Fantasy Games peers do this.

   Guide: CDN Guide for Website Owners

4. Priority 4 · Harden

   Framing restricted

   Observed: The homepage did not send frame-ancestors or X-Frame-Options, so other sites may frame it.

   What to do: Send Content-Security-Policy: frame-ancestors 'self' (or a list of trusted origins). X-Frame-Options: SAMEORIGIN covers older browsers.

   On Cloudflare: Add the header with a response header transform rule.

   34% of Sports Broadcast & Fantasy Games peers do this.

   Guide: A Practical Website Health Check for Owners

What sleeper.com already does well

Practices fewer than half of Sports Broadcast & Fantasy Games peers use.

• DMARC policy enforces quarantine or rejectDMARC policy p=quarantine.32% of peers
• Modern image formats in useWebP or AVIF images detected.35% of peers
• Reachable over IPv6IPv6 address published.43% of peers

What we saw

Homepage checked

https://sleeper.com/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

Google Trust Services, 90-day validity, expiring 2027-01-17

CDN or edge

Cloudflare

Platform or framework

Next.js

DNS operators

Cloudflare

HSTS

max-age 182 days, includeSubDomains

DMARC policy

p=quarantine

Homepage HTML

2,001 KB, gzip

Images on homepage

150 (png 133, webp 17)

Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.

Stack and providers

Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.

All 31 checks

Select a gap for the method and fix. How each check works

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Sports Broadcast & Fantasy Games readiness benchmark