{
  "api": "http-headers",
  "title": "HTTP Headers",
  "description": "Common HTTP request and response headers and their purpose.",
  "emoji": "📨",
  "license": "GPL-2.0-or-later",
  "count": 36,
  "self": "https://gratisapi.com/api/http-headers/index",
  "endpoints": {
    "list": "https://gratisapi.com/api/http-headers/index",
    "item": "https://gratisapi.com/api/http-headers/{id}"
  },
  "fields": [
    "description",
    "example",
    "header",
    "id",
    "type"
  ],
  "results": [
    {
      "id": "accept",
      "header": "Accept",
      "type": "Request",
      "description": "Advertises which content types the client can understand.",
      "example": "text/html",
      "url": "https://gratisapi.com/api/http-headers/accept"
    },
    {
      "id": "accept-encoding",
      "header": "Accept-Encoding",
      "type": "Request",
      "description": "Lists the content encodings (compression) the client accepts.",
      "example": "gzip, deflate, br",
      "url": "https://gratisapi.com/api/http-headers/accept-encoding"
    },
    {
      "id": "accept-language",
      "header": "Accept-Language",
      "type": "Request",
      "description": "Indicates the natural languages the client prefers.",
      "example": "en-US,en;q=0.9",
      "url": "https://gratisapi.com/api/http-headers/accept-language"
    },
    {
      "id": "authorization",
      "header": "Authorization",
      "type": "Request",
      "description": "Contains credentials to authenticate the client with the server.",
      "example": "Bearer eyJhbGciOiJIUzI1NiJ9",
      "url": "https://gratisapi.com/api/http-headers/authorization"
    },
    {
      "id": "cache-control",
      "header": "Cache-Control",
      "type": "Both",
      "description": "Directives for caching mechanisms in both requests and responses.",
      "example": "no-cache",
      "url": "https://gratisapi.com/api/http-headers/cache-control"
    },
    {
      "id": "connection",
      "header": "Connection",
      "type": "Both",
      "description": "Controls whether the network connection stays open after the transaction.",
      "example": "keep-alive",
      "url": "https://gratisapi.com/api/http-headers/connection"
    },
    {
      "id": "content-encoding",
      "header": "Content-Encoding",
      "type": "Both",
      "description": "Specifies the compression algorithm applied to the message body.",
      "example": "gzip",
      "url": "https://gratisapi.com/api/http-headers/content-encoding"
    },
    {
      "id": "content-length",
      "header": "Content-Length",
      "type": "Both",
      "description": "The size of the message body, in bytes.",
      "example": "348",
      "url": "https://gratisapi.com/api/http-headers/content-length"
    },
    {
      "id": "content-type",
      "header": "Content-Type",
      "type": "Both",
      "description": "Indicates the media type of the message body.",
      "example": "application/json",
      "url": "https://gratisapi.com/api/http-headers/content-type"
    },
    {
      "id": "cookie",
      "header": "Cookie",
      "type": "Request",
      "description": "Sends stored cookies previously set by the server back to it.",
      "example": "session_id=abc123",
      "url": "https://gratisapi.com/api/http-headers/cookie"
    },
    {
      "id": "date",
      "header": "Date",
      "type": "Both",
      "description": "The date and time at which the message was originated.",
      "example": "Tue, 15 Nov 1994 08:12:31 GMT",
      "url": "https://gratisapi.com/api/http-headers/date"
    },
    {
      "id": "etag",
      "header": "ETag",
      "type": "Response",
      "description": "An identifier for a specific version of a resource, used for caching.",
      "example": "\"33a64df5\"",
      "url": "https://gratisapi.com/api/http-headers/etag"
    },
    {
      "id": "expires",
      "header": "Expires",
      "type": "Response",
      "description": "The date/time after which the response is considered stale.",
      "example": "Wed, 21 Oct 2025 07:28:00 GMT",
      "url": "https://gratisapi.com/api/http-headers/expires"
    },
    {
      "id": "host",
      "header": "Host",
      "type": "Request",
      "description": "Specifies the domain name and optional port of the target server.",
      "example": "www.example.com",
      "url": "https://gratisapi.com/api/http-headers/host"
    },
    {
      "id": "if-modified-since",
      "header": "If-Modified-Since",
      "type": "Request",
      "description": "Makes the request conditional on the resource being modified since a date.",
      "example": "Sat, 29 Oct 1994 19:43:31 GMT",
      "url": "https://gratisapi.com/api/http-headers/if-modified-since"
    },
    {
      "id": "if-none-match",
      "header": "If-None-Match",
      "type": "Request",
      "description": "Makes the request conditional; server responds only if the ETag differs.",
      "example": "\"33a64df5\"",
      "url": "https://gratisapi.com/api/http-headers/if-none-match"
    },
    {
      "id": "last-modified",
      "header": "Last-Modified",
      "type": "Response",
      "description": "The date and time the resource was last changed.",
      "example": "Tue, 15 Nov 1994 12:45:26 GMT",
      "url": "https://gratisapi.com/api/http-headers/last-modified"
    },
    {
      "id": "location",
      "header": "Location",
      "type": "Response",
      "description": "Indicates the URL to redirect to, or the URL of a newly created resource.",
      "example": "https://example.com/new",
      "url": "https://gratisapi.com/api/http-headers/location"
    },
    {
      "id": "origin",
      "header": "Origin",
      "type": "Request",
      "description": "Indicates the origin (scheme, host, port) that caused the request.",
      "example": "https://example.com",
      "url": "https://gratisapi.com/api/http-headers/origin"
    },
    {
      "id": "referer",
      "header": "Referer",
      "type": "Request",
      "description": "The address of the page that linked to the requested resource.",
      "example": "https://example.com/page",
      "url": "https://gratisapi.com/api/http-headers/referer"
    },
    {
      "id": "retry-after",
      "header": "Retry-After",
      "type": "Response",
      "description": "Indicates how long to wait before making a follow-up request.",
      "example": "120",
      "url": "https://gratisapi.com/api/http-headers/retry-after"
    },
    {
      "id": "server",
      "header": "Server",
      "type": "Response",
      "description": "Describes the software used by the origin server.",
      "example": "nginx/1.21.0",
      "url": "https://gratisapi.com/api/http-headers/server"
    },
    {
      "id": "set-cookie",
      "header": "Set-Cookie",
      "type": "Response",
      "description": "Sends a cookie from the server to be stored by the client.",
      "example": "session_id=abc123; HttpOnly",
      "url": "https://gratisapi.com/api/http-headers/set-cookie"
    },
    {
      "id": "transfer-encoding",
      "header": "Transfer-Encoding",
      "type": "Response",
      "description": "Specifies the form of encoding used to transfer the message body.",
      "example": "chunked",
      "url": "https://gratisapi.com/api/http-headers/transfer-encoding"
    },
    {
      "id": "user-agent",
      "header": "User-Agent",
      "type": "Request",
      "description": "Identifies the client software originating the request.",
      "example": "Mozilla/5.0",
      "url": "https://gratisapi.com/api/http-headers/user-agent"
    },
    {
      "id": "vary",
      "header": "Vary",
      "type": "Response",
      "description": "Lists request headers that affect how the response is selected for caching.",
      "example": "Accept-Encoding",
      "url": "https://gratisapi.com/api/http-headers/vary"
    },
    {
      "id": "www-authenticate",
      "header": "WWW-Authenticate",
      "type": "Response",
      "description": "Defines the authentication method to gain access to a resource.",
      "example": "Basic realm=\"Access\"",
      "url": "https://gratisapi.com/api/http-headers/www-authenticate"
    },
    {
      "id": "access-control-allow-origin",
      "header": "Access-Control-Allow-Origin",
      "type": "Response",
      "description": "Indicates which origins may access the resource (CORS).",
      "example": "*",
      "url": "https://gratisapi.com/api/http-headers/access-control-allow-origin"
    },
    {
      "id": "content-disposition",
      "header": "Content-Disposition",
      "type": "Response",
      "description": "Indicates whether content is displayed inline or treated as a download.",
      "example": "attachment; filename=\"file.pdf\"",
      "url": "https://gratisapi.com/api/http-headers/content-disposition"
    },
    {
      "id": "content-security-policy",
      "header": "Content-Security-Policy",
      "type": "Response",
      "description": "Controls resources the user agent is allowed to load for a page.",
      "example": "default-src 'self'",
      "url": "https://gratisapi.com/api/http-headers/content-security-policy"
    },
    {
      "id": "strict-transport-security",
      "header": "Strict-Transport-Security",
      "type": "Response",
      "description": "Forces the browser to use HTTPS for future requests to the domain.",
      "example": "max-age=31536000",
      "url": "https://gratisapi.com/api/http-headers/strict-transport-security"
    },
    {
      "id": "x-forwarded-for",
      "header": "X-Forwarded-For",
      "type": "Request",
      "description": "Identifies the originating IP address of a client through a proxy.",
      "example": "203.0.113.195",
      "url": "https://gratisapi.com/api/http-headers/x-forwarded-for"
    },
    {
      "id": "x-frame-options",
      "header": "X-Frame-Options",
      "type": "Response",
      "description": "Controls whether a page may be rendered in a frame or iframe.",
      "example": "DENY",
      "url": "https://gratisapi.com/api/http-headers/x-frame-options"
    },
    {
      "id": "x-content-type-options",
      "header": "X-Content-Type-Options",
      "type": "Response",
      "description": "Prevents the browser from MIME-sniffing the content type.",
      "example": "nosniff",
      "url": "https://gratisapi.com/api/http-headers/x-content-type-options"
    },
    {
      "id": "range",
      "header": "Range",
      "type": "Request",
      "description": "Requests only part of a resource, specified as byte ranges.",
      "example": "bytes=0-1023",
      "url": "https://gratisapi.com/api/http-headers/range"
    },
    {
      "id": "age",
      "header": "Age",
      "type": "Response",
      "description": "The time in seconds the object has been in a proxy cache.",
      "example": "24",
      "url": "https://gratisapi.com/api/http-headers/age"
    }
  ]
}