Constructor

php
public function __construct(&$db)	

• $db - Database object reference Initialization Steps:

1. Stores database reference
2. Extracts and normalizes REQUEST_URI (e.g., 'PageOfNoReturn/show?a=1')

session($route): void

• $route (int) - Routing flag:
• Bit 2 ($route & 2): Enable static mode for files/freecap (disables replay prevention and ID regeneration) Features:
• Selects storage backend (file or database)
• Configures cookie settings (security, path, httponly)
• Binds IP and TLS validation
• Recovers diagnostic logs from previous session Example:

  php
  $http->session(0);  // Normal session
  $http->session(2);  // Static file serving mode	

  ---

Private Properties Caching System

• $page (string) - Page name to cache
• $method (string) - Request method/action (e.g., 'show', 'edit') Caching Rules:
• ✅ Enabled for GET requests only
• ✅ Disabled for POST requests
• ❌ Never cached for 'edit' or 'watch' methods
• ✅ Only cached for anonymous users (no logged-in users) Example:

  php
  $http->check_cache('HomePage', 'show');	

  ---

store_cache(): void

• Retrieves output buffer content
• Saves to cache file with proper permissions
• Records cache metadata in database
• Only executes if caching flag is set and user is anonymous Example:

  php
  // Called at end of page rendering
  $http->store_cache();	

  ---

invalidate_page($page): int

• $page (string) - Page name to invalidate Returns:
• Number of cache entries invalidated Process:

1. Finds all cached versions (different methods/languages)
2. Touches files to past timestamp (faster than deletion)
3. Removes entries from cache metadata table
4. Returns count of invalidated caches Example:

   php
   $count = $http->invalidate_page('HomePage');
   echo "Invalidated $count cache entries";	

   ---

TLS/HTTPS Security

secure_base_url(): void

• Ensures all subsequent URLs use HTTPS
• Stores original HTTP URL for fallback
• Called when TLS session marking

php
$http->secure_base_url();
// $db->base_url now uses https://	

ensure_tls($url): void

• $url (string) - URL to secure Behavior:
• If not already HTTPS and TLS is enabled, forces HTTPS redirect
• Handles both relative and absolute URLs
• Converts relative URLs using current server name <!markup:2:begin>Example:

  php
  $http->ensure_tls('/secure/payment');	

  ---

IP Address Detection

real_ip(): string (Private)

1. HTTP_X_CLUSTER_CLIENT_IP
2. HTTP_X_FORWARDED_FOR (or custom header)
3. HTTP_CLIENT_IP
4. HTTP_X_REMOTE_ADDR
5. REMOTE_ADDR (fallback) Features:

• Filters out private/reserved IP ranges
• Respects configured reverse proxy addresses
• Returns '0.0.0.0' as fallback Configuration in Database:
• reverse_proxy_addresses - Comma/space-separated proxy IPs
• reverse_proxy_header - Custom header name (default: X-Forwarded-For) Example:

  php
  $client_ip = $http->ip;  // e.g., "203.0.113.42"	

  ---

HTTPS Detection

tls_session(): bool (Private)

• $_SERVER['HTTPS'] is 'on'
• $_SERVER['SERVER_PORT'] is 443
• $_SERVER['HTTP_X_FORWARDED_PROTO'] is 'https'
• $_SERVER['HTTP_X_FORWARDED_SSL'] is 'on'
• $_SERVER['HTTP_X_FORWARDED_PORT'] is 443

  ---

Security Headers

http_security_headers(): void

HTTP Methods

redirect($url, $permanent = false): void

• $url (string) - Target URL
• $permanent (bool) - Use 301 (permanent) vs 302 (temporary) Features:
• Decodes & entities to prevent broken redirects
• Only works if headers not yet sent
• Uses output buffering to work anywhere in page processing Example:

  php
  $http->redirect('http://example.com/new-page', true);  // 301
  $http->redirect('/wiki/HomePage');                       // 302	

  ---

terminate(): void

• Saves diagnostic logs to session flash data
• Ends script execution Example:

  php
  $http->terminate();	

  ---

status($code): void

php
200 => 'OK'
206 => 'Partial Content'
301 => 'Moved Permanently'
302 => 'Moved Temporarily'
304 => 'Not Modified'
400 => 'Bad Request'
401 => 'Unauthorized'
403 => 'Forbidden'
404 => 'Not Found'
405 => 'Method Not Allowed'
409 => 'Conflict'
410 => 'Gone'
416 => 'Requested Range Not Satisfiable'
500 => 'Internal Server Error'
501 => 'Not Implemented'
503 => 'Service Unavailable'	

php
$http->status(404);  // Send 404 Not Found	

Caching Control

no_cache($client_only = true): void

• $client_only (bool, default: TRUE)
• TRUE: Disable browser cache only
• FALSE: Disable both browser and server cache Headers Set:
• Last-Modified: <current-time> (always fresh)
• Cache-Control: no-store Example:

  php
  $http->no_cache();        // Client-side only
  $http->no_cache(false);   // Both client & server	

  ---

cache_promisc(): void

• Cache-Control: public Example:

  php
  $http->cache_promisc();	

  ---

Language Negotiation

user_agent_language(): string

• Follows RFC 9110 section 12.5.4 (HTTP Accept-Language)
• Parses Accept-Language header with quality factors
• Attempts exact match first, then language fallback
• Falls back to default system language Example Header:

  Accept-Language: en-US,en;q=0.9,de;q=0.8	

  Returns:
• Language code

available_languages($subset = true): array

• $subset (bool, default: TRUE)
• TRUE: Only allowed languages
• FALSE: All available languages Features:
• Scans LANG_DIR for language files
• Filters by allowed_languages config if set
• Caches result in session
• System language always included Returns:
• Associative array: ['en' => 'en', 'de' => 'de', ...] Example:

  php
  $all_langs = $http->available_languages(false);
  $allowed = $http->available_languages(true);	

  ---

File Serving

sendfile($path, $filename = null, $age = null): void

• $path (string) - File path (or HTTP_XXX constant for error pages)
• $filename (string, optional) - Custom download filename
• $age (int, optional) - Cache age in days Features:
• HTTP range request support (partial file downloads)
• ETag and Last-Modified conditional requests
• Proper MIME type detection
• Content-Security-Policy for special file types
• Streaming for large files
• GZip compression for text files Special Paths:

  php
  $http->sendfile(404);  // Serves file defined by HTTP_404 constant
  $http->sendfile(403);  // Serves file defined by HTTP_403 constant	

  Example:

  php
  $http->sendfile('uploads/document.pdf', 'my-document.pdf', 30);	

  ---

mime_type($path): string

• MIME type string (e.g., 'application/pdf')
• Default: 'application/octet-stream' Example:

  php
  $mime = $http->mime_type('file.pdf');  // 'application/pdf'	

  ---

mime_types(): array (Private)

• Reads from config/mime.types
• Caches to cache/config/mime.types
• Reloads if config is updated

  ---

Compression

gzip(): void

• Manually implements gzip (not relying on zlib.output_compression)
• Produces correct Content-Length header
• Only compresses if:
• 860 bytes < content < 1 MB
• Client accepts compression
• Headers not already sent Example:

  php
  $http->gzip();	

  ---

Utility Methods

parse_str($str): array (Private)

• Safely handles special characters in query/form data
• Converts encoding properly Example:

  php
  $data = $http->parse_str('name=John&age=30');	

  ---

request_uri(): string (Private)

• Removes base URL prefix
• Removes spaces
• Collapses multiple slashes
• Removes .. path

cut_prefix($prefix, $path): string (Private)

get_header_conf($file_name): string (Private)

• csp.conf / csp_custom.conf
• permissions_policy.conf / permissions_policy_custom.conf

  ---

Configuration Dependencies

Constants Used

Workflow Examples

Example 1: Handling a GET Request

php
// In main wiki entry point
$http = new Http($db);
$http->session(0);  // Start session

// Check<!--markup:2:end--> if page <!--markup:1:begin-->should<!--markup:1:end--> <!--markup:2:begin-->can<!--markup:2:end--> be <!--markup:2:begin-->served from cache
$http->check_cache('HomePage', 'show');

// ... render page content ...

// Store rendered page in cache if applicable
$http->store_cache();

// Send security headers
$http->http_security_headers();

// Possibly compress output
$http->gzip();	

Example 2: Handling TLS/HTTPS Upgrade

php
$http = new Http($db);  // Constructor detects TLS requirement
// If TLS is enabled and user wasn't in TLS before:
// - Sets TLS session flag
// - Marks session with TLS cookie
// - Redirects to HTTPS version	

Example 3: Invalidating Cache After Page Edit

php
// User edits a page
$http = new Http($db);
$count = $http->invalidate_page('HomePage');
// All<!--markup:2:end--> cached <!--markup:1:begin-->(0 or 1) ||
|<!--markup:1:end--> <!--markup:2:begin-->versions (different languages, methods) are invalidated	

Example 4: Serving a File

php
$http = new Http($db);
$http->session(2);  // Static file mode - no session replay prevention

// Serve with 30-day cache
$http->sendfile('uploads/manual.pdf', 'user-manual.pdf', 30);