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+---
+title: The ultimate HTTP talk
+description: An example slide deck created by Marp CLI
+author: Yuki Hattori
+keywords: marp,marp-cli,slide
+url: https://marp.app/
+image: https://marp.app/og-image.jpg
+---
+
+# HYPER HYPER!
+
+## The ultimate HTTP talk
+
+---
+
+# Headers
+
+- X means unofficial
+- Request/Response
+
+---
+
+# Request Headers
+
+---
+
+# Cookie Header
+
+---
+
+# Forwarded Header
+
+- Replacement for `X-Forwarded-For`, `X-Forwarded-Host` and `X-Forwarded-Proto`
+- `Forwarded: by=<identifier>;for=<identifier>;host=<host>;proto=<http|https>`
+- IPv6 addresses need double quotes and brackets
+
+https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Forwarded
+
+---
+
+# Host Header
+
+- `Host: <host>:<port>`
+
+---
+
+# Referer Header
+
+- This is how they make money
+
+---
+
+# Upgrade (HTTP/1.1)
+
+- `Upgrade: <protocol>[/<protocol_version>]`
+- Upgrade connection to different HTTP version or Websocket
+
+---
+
+# User-Agent Header
+
+- `User-Agent: <product> / <product-version> <comment>`
+- `Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0`
+
+---
+
+# Via Header
+
+- `Via: [<protocol-name>/]<protocol-version> <host>[:<port>]`
+- `Via: [<protocol-name>/]<protocol-version> <pseudonym>`
+
+---
+
+# Response Headers
+
+---
+
+# ETag Header
+
+- `ETag: W/"<etag_value>"`
+- `ETag: "<etag_value>"`
+
+---
+
+# todo
+
+-