fpHTTPClient unit

HTTP client implementation for making HTTP requests

The fpHttpClient unit provides a complete HTTP client implementation for making HTTP requests. It supports all standard HTTP methods (GET, POST, PUT, DELETE, PATCH, OPTIONS, HEAD), SSL/TLS connections, redirects, authentication, cookies, and form posting including file uploads.

The main classes are TFPCustomHTTPClient (base class) and TFPHTTPClient (with published properties). The unit also supports Server-Sent Events through TCustomHTTPEventSource and proxy connections through TProxyData.

Classes and records

`EHTTPClient`	class	Exception class for HTTP client errors
`EHTTPClientSocket`	class	Exception class for HTTP client socket errors
`EHTTPClientSocketRead`	class	Exception class for HTTP client socket read errors
`EHTTPClientSocketWrite`	class	Exception class for HTTP client socket write errors
`TCustomHTTPEventSource`	class	Base class for Server-Sent Events (SSE) client
`TFPCustomHTTPClient`	class	Base HTTP client class for making HTTP requests
`TFPHTTPClient`	class	Full-featured HTTP client with published properties
`THTTPEventSource`	class	Default Server-Sent Events source implementation
`TProxyData`	class	Proxy server configuration data

Procedures and functions

`DecodeURLElement`	function	URL-decodes a string from URL encoding
`EncodeURLElement`	function	URL-encodes a string for use in URLs

Types

`TDataEvent`	procedure type	Event type for tracking data transfer progress
`TGetSocketHandlerEvent`	procedure type	Event type for providing custom socket handlers
`THTTPEventStreamHandler`	procedure type	Event type for handling Server-Sent Events streams
`THTTPVerifyCertificateEvent`	procedure type	Event type for SSL certificate verification
`TPasswordEvent`	procedure type	Event type for handling authentication challenges
`TRedirectEvent`	procedure type	Event type for handling HTTP redirects
`TSocketHandlerCreatedEvent`	procedure type	Event type called after socket handler creation

Constants

`DefaultMaxHeaderCount`	constant
`DefaultMaxHeaderLineLength`	constant
`DefaultMaxResponseSize`	constant
`DefMaxRedirects`	constant	Default maximum number of HTTP redirects to follow
`ReadBufLen`	constant	Default buffer size for socket reading operations

Topics

`fpHttpClientAdvanced`	topic	Advanced TFPHTTPClient Features
`fpHttpClientFileUpload`	topic	File Upload with Local Filename
`fpHttpClientFormPost`	topic	Form Data and File Upload with fpHttpClient
`fpHttpClientHttps`	topic	HTTPS Support in TFPHTTPClient
`fpHttpClientMethods`	topic	HTTP Methods with TFPHTTPClient
`fpHttpClientUsage`	topic	Using the TFPHTTPClient

Uses

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