HTTPProtocol unit

This unit provides HTTP 1.1 protocol definitions, constants, and utility functions for web applications. It includes:

• HTTP header type definitions and string constants
• URL encoding and decoding functions
• HTTP status code text lookup
• HTTP date/time parsing utilities
• Cookie formatting constants

Procedures and functions

ExcludeHTTPPathDelimiter	function	Removes trailing forward slash from a URL path.
GetHTTPStatusText	function	Returns descriptive text for HTTP status codes.
HeaderName	function	Returns the string name of an HTTP header.
HeaderType	function	Returns the header type for a given header string.
HTTPDecode	function	Decodes HTTP URL-encoded strings.
HTTPEncode	function	Encodes strings for HTTP URL transmission.
IncludeHTTPPathDelimiter	function	Ensures a URL path ends with a forward slash.
ParseHTTPDateTime	function	Parses HTTP date/time strings to TDateTime.

Types

THeader	enumeration	Enumeration of standard HTTP 1.1 headers.
THeaderDirection	enumeration	Direction of HTTP header usage.
THeaderDirections	set	Set of header direction values.
THeaders	set	Set of HTTP headers.
THeadersArray	type	Array of header name strings indexed by THeader.
THTTPUnsafeChar	type	Type for representing unsafe characters in HTTP encoding.
THTTPUnsafeChars	set	Set of characters that are unsafe for HTTP URLs.

Constants

HeaderAccept	constant	Accept header name string.
HeaderAcceptCharset	constant	Accept-Charset header name string.
HeaderAcceptEncoding	constant	Accept-Encoding header name string.
HeaderAcceptLanguage	constant	Accept-Language header name string.
HeaderAcceptRanges	constant	Accept-Ranges header name string.
HeaderAge	constant	Age header name string.
HeaderAllow	constant	Allow header name string.
HeaderAuthorization	constant	Authorization header name string.
HeaderCacheControl	constant	Cache-Control header name string.
HeaderConnection	constant	Connection header name string.
HeaderContentEncoding	constant	Content-Encoding header name string.
HeaderContentLanguage	constant	Content-Language header name string.
HeaderContentLength	constant	Content-Length header name string.
HeaderContentLocation	constant	Content-Location header name string.
HeaderContentMD5	constant	Content-MD5 header name string.
HeaderContentRange	constant	Content-Range header name string.
HeaderContentType	constant	Content-Type header name string.
HeaderCookie	constant	Cookie header name constant.
HeaderDate	constant	Date header name string.
HeaderETag	constant	ETag header name string.
HeaderExpect	constant	Expect header name string.
HeaderExpires	constant	Expires header name string.
HeaderFrom	constant	From header name string.
HeaderHost	constant	Host header name string.
HeaderIfMatch	constant	If-Match header name string.
HeaderIfModifiedSince	constant	If-Modified-Since header name string.
HeaderIfNoneMatch	constant	If-None-Match header name string.
HeaderIfRange	constant	If-Range header name string.
HeaderIfUnModifiedSince	constant	If-Unmodified-Since header name string.
HeaderLastModified	constant	Last-Modified header name string.
HeaderLocation	constant	Location header name string.
HeaderMaxForwards	constant	Max-Forwards header name string.
HeaderPragma	constant	Pragma header name string.
HeaderProxyAuthenticate	constant	Proxy-Authenticate header name string.
HeaderProxyAuthorization	constant	Proxy-Authorization header name string.
HeaderRange	constant	Range header name string.
HeaderReferer	constant	Referer header name string.
HeaderRetryAfter	constant	Retry-After header name string.
HeaderServer	constant	Server header name string.
HeaderSetCookie	constant	Set-Cookie header name constant.
HeaderTE	constant	TE header name string.
HeaderTrailer	constant	Trailer header name string.
HeaderTransferEncoding	constant	Transfer-Encoding header name string.
HeaderUpgrade	constant	Upgrade header name string.
HeaderUserAgent	constant	User-Agent header name string.
HeaderVary	constant	Vary header name string.
HeaderVia	constant	Via header name string.
HeaderWarning	constant	Warning header name string.
HeaderWWWAuthenticate	constant	WWW-Authenticate header name string.
HeaderXRequestedWith	constant	X-Requested-With header name string.
HTTPDateFmt	constant	Format string for HTTP date formatting.
HTTPDays	constant	Array of 3-letter day abbreviations for HTTP dates.
HTTPHeaderDirections	constant	Array defining which direction each header type is used in.
HTTPHeaderNames	constant	Array mapping header types to their string names.
HTTPMonths	constant	Array of 3-letter month abbreviations for HTTP dates.
SCookieDomain	constant	Format string for cookie domain attribute.
SCookieExpire	constant	Format string for cookie expiration date.
SCookieHttpOnly	constant	String for cookie HttpOnly attribute.
SCookiePath	constant	Format string for cookie path attribute.
SCookieSameSite	constant	String for cookie SameSite attribute.
SCookieSecure	constant	String for cookie Secure attribute.

Uses

• Classes
• SysUtils
• DateUtils