HTTP Header Checker
Crawling at scale?
When you need to inspect thousands of URLs without getting blocked, route through Rainproxy. Clean residential IPs, real fingerprints, 98.7% success rate.
Inspect any URL like a browser would, without the browser
A real GET request, followed end-to-end through every redirect, with the security and caching headers broken out for you.
We send a real request
A server-side fetch hits your URL with browser-style headers, no CORS, no client-side limits.
Follow the redirect chain
Each 3xx hop is captured with its status, location and headers so you can debug loops and traps.
Audit the final response
Status, security headers, caching and the full header list. Laid out for fast SEO and infra review.
Security header audit
Instant verdict on HSTS, CSP, X-Frame-Options, Referrer-Policy and more. Flagged when missing.
Cache + CDN signals
Spot stale caches, missing Cache-Control directives and CDN debug headers in one glance.
SEO redirect debugging
Catch redirect chains, 302→301 issues and broken canonical hops before Google does.
响应头检测能看到什么
这个 Rainproxy 免费工具会抓取任意 URL 并展示服务器真正返回的内容：状态码、重定向链的每一跳，以及包含安全、缓存与内容相关头在内的完整响应头。在做 SEO 审计或上线检查时，它是弄清“这个 URL 到底在做什么”最快的方式。
状态码与重定向链
工具会跟随重定向并列出每一跳，例如 301 到 http、再到 www、再到 https、最后加上斜杠。这样的长链条浪费抓取预算并稀释链接权重。搜索引擎把 301 视为永久并传递排名信号，302 则是临时的、处理方式不同。把整条链一次看清，通常就足以定位配置问题。
值得配置的安全响应头
响应头决定了浏览器侧很大一部分安全能力，而且很容易被忽略，因为缺失时页面表面上一切正常。
- Strict-Transport-Security：强制后续访问使用 HTTPS
- Content-Security-Policy：限制可加载的脚本与来源
- X-Content-Type-Options：阻止 MIME 嗅探
- X-Frame-Options 或 frame-ancestors：防止点击劫持
- Referrer-Policy 与 Permissions-Policy：减少向第三方泄露的信息
缓存与 CDN 响应头
Cache-Control、ETag、Age 以及 CF-Cache-Status 等厂商头可以告诉你响应是来自缓存还是每次重新生成。如果本应被缓存的页面每次都显示 miss，这就是性能问题，在它反映到统计数据之前就能在这里发现。