FAQ

Request	Response
Accept-Encoding	Content-Encoding

• Response
  • Accept-Ranges: bytes|none - 是否支持部分请求

Accept-Encoding: br;q=1.0, gzip;q=0.8, *;q=0.1
Range: bytes=200-1000, 2000-6576, 19000-

Transfer-Encoding vs Content-Encoding

• Transfer-Encoding - 可动态修改 - 传输层
• Content-Encoding - 不要动态修改 - 业务逻辑层
  • 大多客户端实现都使用 Content-Encoding 检测压缩

---

# 返回 content-encoding: gzip
curl -H 'Accept-encoding: gzip' -I https://s.wener.me

curl -H 'Accept-encoding: zstd, br, gzip, deflate' -I https://s.wener.me

• What will Cloudflare compress?
• https://stackoverflow.com/a/11664307/1870054

301 vs 302

• 301 Moved Permanently
  • 永久，客户端下次可能直接映射重定向后的地址
• 302 Found / Moved Temporarily
  • 临时，还会再请求
• 303 See Other
  • 特定语义
• 307 Temporary Redirect
  • 请求重发
  • 支持 POST
• 308 Permanent Redirect
  • 类似 301 但不允许修改 method

HTTP SEARCH/QUERY Method

• GET 支持缓存，但不能携带 Body 请求
• POST 可以用作查询，但不能缓存
• 目前应该会支持 QUERY 方法

HTTP SEARCH is a new HTTP method, for safe requests that include a request body. It's still early & evolving, but it was recently adopted as an IETF draft standard, and it's going to add some great new tools for HTTP development everywhere.

-- httptoolkit

---

• https://datatracker.ietf.org/doc/draft-ietf-httpbis-safe-method-w-body/
• https://github.com/httpwg/http-extensions/labels/safe-method-w-body
• https://httptoolkit.com/blog/http-search-method/
• ecosystem
  • https://github.com/nestjs/nest/pull/10533 NextJS v10 support SEARCH method
  • Support for new HTTP QUERY method akka-http#3936

Accept-Encoding

• Chrome 123
  • Accept-Encoding: gzip, deflate, br, zstd
• nodejs/undici#2847
  • fetch zstd support
• https://caniuse.com/zstd
• https://github.com/web-platform-tests/wpt/tree/master/fetch/content-encoding/zstd

Real IP

• X-Forwarded-For
  • 反向代理
  • X-Forwarded-For: <client>, <proxy1>, <proxy2>
• Forwarded
  • RFC 7239
  • Forwarded: for=<client-ip>, for=<proxy1>;proto=https;by=<proxy2>
• X-Real-IP
  • Nginx
• CF-Connecting-IP
  • Cloudflare
  • CF-Connecting-IP: <client-ip>
• True-Client-Ip
  • Cloudflare Enterprise
  • Akamai CDN
  • True-Client-IP: <client-ip>
• X-Cluster-Client-IP
  • AWS Elastic Load Balancer
  • X-Cluster-Client-IP: <client-ip>
• cf-ray
• cf-visitor

---

• Proxy
  • Via: <protocol> <hostname>
  • X-Forwarded-Proto
  • X-Forwarded-Host
• Request-Start: t=1672531200
• X-Request-ID
• Request-ID