Editing HTTP Protocols (section)

== Common HTTP Headers ==

{| class="wikitable"
! Header !! Purpose
|-
| Host || Indicates the domain being requested
|-
| User-Agent || Identifies the requesting client software
|-
| Accept || Lists acceptable response media types
|-
| Accept-Encoding || Lists acceptable compression algorithms (e.g., gzip, br)
|-
| Accept-Language || Lists acceptable languages for the response
|-
| Authorization || Contains credentials (e.g., Basic or Bearer)
|-
| Content-Type || Declares the media type of the request or response body
|-
| Content-Length || Size of the body in bytes
|-
| Cache-Control || Directives for caching mechanisms
|-
| Connection || Controls whether the connection should be kept alive
|-
| Cookie || Sends stored cookies from the client to the server
|-
| Set-Cookie || Instructs client to store a cookie
|-
| Referer || Indicates the address of the previous web page
|-
| Origin || Indicates where the request originated from (used in CORS)
|-
| Location || Indicates the URL to redirect a client to (used with 3xx responses)
|-
| X-Forwarded-For || Shows original IP when behind a proxy/load balancer
|-
| Upgrade-Insecure-Requests || Indicates client prefers secure content (HTTPS)
|-
| If-Modified-Since || Used to make conditional requests based on last modification date
|-
| ETag || Identifier for specific version of a resource
|-
| Range || Requests partial content (used in downloads/streaming)
|}