HTTPDefs unit

Basic HTTP protocol declarations and classes

The HTTPDefs unit provides essential types, constants, and classes for HTTP protocol handling. It contains basic HTTP header field definitions, request and response classes, cookie management, file upload support, and MIME content handling for web applications.

Classes and records

`EHTTP`	class	HTTP exception class
`TCookie`	class	HTTP cookie implementation
`TCookies`	class	Collection of HTTP cookies
`TCORSSupport`	class	Cross-Origin Resource Sharing support
`TCustomSession`	class	Base class for HTTP session management
`THTTPHeader`	class	Base class for HTTP header management
`THTTPServerEvent`	record	Server-sent event data structure
`TMimeItem`	class	Represents a MIME multipart item
`TMimeItems`	class	Collection of MIME multipart items
`TRequest`	class	HTTP request representation
`TResponse`	class	HTTP response representation
`TStreamingMimeItems`	class	Collection for streaming MIME multipart items
`TUploadedFile`	class	Represents an uploaded file in an HTTP request
`TUploadedFiles`	class	Collection of uploaded files

Procedures and functions

`HTTPDecode`	function	Decodes URL-encoded string
`HTTPEncode`	function	Encodes string for URL transmission
`IncludeHTTPPathDelimiter`	function	Ensures path ends with forward slash
`PayloadTooLarge`	procedure

Types

`HTTPError`	type	Creates an HTTP error exception
`RTLString`	type	Runtime library string type
`TContentStreamingState`	enumeration	Content streaming state enumeration
`TCORSOption`	enumeration	Options for CORS (Cross-Origin Resource Sharing) configuration
`TCORSOptions`	set	Set of CORS options
`THandleCORSOption`	enumeration	Options for handling CORS requests
`THandleCORSOptions`	set	Set of CORS handling options
`THttpFields`	type	Array of HTTP header field names
`THttpIndexes`	type	Array of HTTP header field indexes
`THTTPVariables`	type	Set of HTTP variable types
`THTTPVariableType`	enumeration	HTTP variable type enumeration
`THTTPVariableTypes`	set	Set of HTTP variable types
`TMimeItemClass`	type	Class type for MIME item instances
`TMimeItemsClass`	type	Class type for MIME items collection
`TOnStreamEncodingEvent`	procedure type	Event type for stream encoding processing
`TOnUnknownEncodingEvent`	procedure type	Event type for handling unknown content encoding
`TRequestEvent`	procedure type	Event procedure type for HTTP request handling
`TResponseEvent`	procedure type	Event procedure type for HTTP response handling
`TSameSite`	enumeration	Cookie SameSite attribute values
`TSessionState`	enumeration	Enumeration of possible session states
`TSessionStates`	set	Set of session states
`TStreamingContentType`	enumeration	Content types for streaming HTTP data
`TUploadedFileClass`	type	Class type for uploaded file instances
`TUploadedFilesClass`	type	Class type for uploaded files collection

Constants

`DefaultAllowedHeaders`	constant	Default set of allowed CORS headers
`DefaultAllowedMethods`	constant	Default set of allowed CORS methods
`DefaultAllowedOrigins`	constant	Default set of allowed CORS origins
`DefaultMaxBodySize`	constant
`DefaultMaxUploadFiles`	constant
`DefaultMaxUploadFileSize`	constant
`DefaultTimeOut`	constant	Default timeout value in seconds
`fieldAccept`	constant	Accept HTTP header field name
`FieldAcceptCharset`	constant	Accept-Charset HTTP header field name
`FieldAcceptEncoding`	constant	Accept-Encoding HTTP header field name
`FieldAcceptLanguage`	constant	Accept-Language HTTP header field name
`FieldAcceptRanges`	constant	Accept-Ranges HTTP header field name
`FieldAge`	constant	Age HTTP header field name
`FieldAllow`	constant	Allow HTTP header field name
`FieldAuthorization`	constant	Authorization HTTP header field name
`FieldCacheControl`	constant	Cache-Control HTTP header field name
`FieldConnection`	constant	Connection HTTP header field name
`FieldContentEncoding`	constant	Content-Encoding HTTP header field name
`FieldContentLanguage`	constant	Content-Language HTTP header field name
`FieldContentLength`	constant	Content-Length HTTP header field name
`FieldContentLocation`	constant	Content-Location HTTP header field name
`FieldContentMD5`	constant	Content-MD5 HTTP header field name
`FieldContentRange`	constant	Content-Range HTTP header field name
`FieldContentType`	constant	Content-Type HTTP header field name
`FieldCookie`	constant	Cookie HTTP header field name
`FieldDate`	constant	Date HTTP header field name
`FieldETag`	constant	ETag HTTP header field name
`FieldExpect`	constant	Expect HTTP header field name
`FieldExpires`	constant	Expires HTTP header field name
`FieldFrom`	constant	From HTTP header field name
`FieldHost`	constant	Host HTTP header field name
`FieldIfMatch`	constant	If-Match HTTP header field name
`FieldIfModifiedSince`	constant	If-Modified-Since HTTP header field name
`FieldIfNoneMatch`	constant	If-None-Match HTTP header field name
`FieldIfRange`	constant	If-Range HTTP header field name
`FieldIfUnModifiedSince`	constant	If-Unmodified-Since HTTP header field name
`FieldLastModified`	constant	Last-Modified HTTP header field name
`FieldLocation`	constant	Location HTTP header field name
`FieldMaxForwards`	constant	Max-Forwards HTTP header field name
`FieldPragma`	constant	Pragma HTTP header field name
`FieldProxyAuthenticate`	constant	Proxy-Authenticate HTTP header field name
`FieldProxyAuthorization`	constant	Proxy-Authorization HTTP header field name
`FieldRange`	constant	Range HTTP header field name
`FieldReferer`	constant	Referer HTTP header field name
`FieldRetryAfter`	constant	Retry-After HTTP header field name
`FieldServer`	constant	Server HTTP header field name
`FieldSetCookie`	constant	Set-Cookie HTTP header field name
`FieldTE`	constant	TE HTTP header field name
`FieldTrailer`	constant	Trailer HTTP header field name
`FieldTransferEncoding`	constant	Transfer-Encoding HTTP header field name
`FieldUpgrade`	constant	Upgrade HTTP header field name
`FieldUserAgent`	constant	User-Agent HTTP header field name
`FieldVary`	constant	Vary HTTP header field name
`FieldVia`	constant	Via HTTP header field name
`FieldWarning`	constant	Warning HTTP header field name
`FieldWWWAuthenticate`	constant	WWW-Authenticate HTTP header field name
`FieldXRequestedWith`	constant	X-Requested-With HTTP header field name
`HeaderBasedVariables`	constant	Set of HTTP variables derived from header fields
`HTTPDateFmt`	constant	HTTP date format string
`HTTPDays`	constant	Array of day abbreviations for HTTP dates
`HTTPFieldIndexes`	constant	Array of HTTP header field index mappings
`HTTPFieldNames`	constant	Array of standard HTTP header field names
`HTTPMonths`	constant	Array of month abbreviations for HTTP dates
`NoHTTPFields`	constant	Number of HTTP header fields
`SCookieDomain`	constant	Cookie domain attribute name
`SCookieExpire`	constant	Cookie expires attribute name
`SCookieHttpOnly`	constant	Cookie HttpOnly attribute name
`SCookiePath`	constant	Cookie path attribute name
`SCookieSameSite`	constant	Cookie SameSite attribute name
`SCookieSecure`	constant	Cookie secure attribute name
`SFPWebSession`	constant	Default session cookie name

Variables

`MimeItemClass`	variable	Global variable for MIME item class type
`MimeItemsClass`	variable	Global variable for MIME items class type
`UploadedFileClass`	variable	Global variable for uploaded file class type
`UploadedFilesClass`	variable	Global variable for uploaded files class type

Topics

`httpcookies`	topic	Working with HTTP Cookies
`httpcors`	topic	CORS Support Usage
`httpcorshandlerequest`	topic	Understanding TCORSSupport.HandleRequest Return Value
`httprequestresponse`	topic	Using TRequest and TResponse Classes
`httpsessions`	topic	Working with HTTP Sessions

Uses

An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.