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1   == HTTP Class Technical Documentation ==
2  
3   === Overview ===
4  
5   The ##Http## class (##src/class/http.php##) is a core component of the WackoWiki system responsible for handling HTTP request/response processing, session management, caching, and security features. This class acts as a bridge between the web server and the wiki engine.
6  
7   **File Location:** ##src/class/http.php##
  1 # HTTP Class Technical Documentation
  2
  3 ## Overview
  4
  5 The `Http` class (`src/class/http.php`) is a core component of the WackoWiki system responsible for handling HTTP request/response processing, session management, caching, and security features. This class acts as a bridge between the web server and the wiki engine.
  6
  7 **File Location:** `src/class/http.php`
8 8 **Language:** PHP
9   **Dependencies:** Database class, Session classes, Utility classes (##Ut##), Diagnostics class (##Diag##)
10  
11   ----
12  
13   === Class Properties ===
14  
15   ==== Public Properties ====
16  
17   #|
18   *| Property | Type | Description |*
19   || ##$tls_session## | bool | Indicates if the current session uses HTTPS/TLS encryption ||
20   || ##$request_uri## | string | Normalized REQUEST_URI (e.g., 'PageOfNoReturn/show?a=1') ||
21   || ##$ip## | string | Client's real IP address (accounts for proxies) ||
22   || ##$sess## | Session | Reference to the Session object ||
23   || ##$method## | string | Current HTTP method/request type ||
24   || ==== Private Properties ==== ||
25   || Property | Type | Description ||
26   || ---------- | ------ | ------------- ||
27   || ##$db## | object | Database connection reference ||
28   || ##$tls_mark## | string | Cookie name for TLS session marking ||
29   || ##$page## | string | Current page name being processed ||
30   || ##$hash## | string | SHA1 hash of the page name ||
31   || ##$query## | string | Encoded query string ||
32   || ##$lang## | string | Current language code ||
33   || ##$file## | string | Cache file path ||
34   || ##$caching## | int | Flag indicating if page should be cached (0 or 1) ||
35   |
36   === Security Considerations ===
37  
38   ==== 1. **IP Address Spoofing** ====
39     - Validates IPs against private ranges
40     - Filters proxy-provided IPs appropriately
41     - Configurable reverse proxy trust
42  
43   ==== 2. **Session Security** ====
44     - Binds sessions to IP address
45     - Binds sessions to TLS status
46     - Supports both file and database storage
47     - HttpOnly cookies by default
48  
49   ==== 3. **TLS Enforcement** ====
50     - Automatic HTTPS upgrade when configured
51     - Marks TLS sessions to prevent downgrade attacks
52     - HSTS header support
53  
54   ==== 4. **Content Security** ====
55     - CSP headers to prevent XSS
56     - X-Frame-Options to prevent clickjacking
57     - X-Content-Type-Options to prevent MIME sniffing
58     - Referrer-Policy control
59     - Permissions-Policy for browser features
60  
61   ==== 5. **File Serving** ====
62     - Validates file existence and readability
63     - Prevents directory traversal via ##realpath()##
64     - Rejects symbolic links
65     - Special CSP for SVG and PDF files
66  
67   ==== 6. **Cache Security** ====
68     - Cached only for anonymous users
69     - Disabled for sensitive operations (edit, watch)
70     - Only GET requests cached
71  
72   ----
73  
74   === Performance Optimization ===
75  
76   ==== 1. **Page Caching** ====
77     - Stores full HTML output
78     - TTL-based expiration
79     - Language and method-aware caching
80     - Conditional request support (304 Not Modified)
81  
82   ==== 2. **MIME Type Caching** ====
83     - Loads MIME types once and caches
84     - Regenerates only when config changes
85  
86   ==== 3. **Session Options** ====
87     - File-based sessions for simple deployments
88     - Database sessions for distributed systems
89  
90   ==== 4. **Compression** ====
91     - Manual gzip implementation
92     - Proper Content-Length generation
93     - Only compresses appropriate sizes
94  
95   ----
96  
97   === Debugging ===
  9 **Dependencies:** Database class, Session classes, Utility classes (`Ut`), Diagnostics class (`Diag`)
  10
  11 ---
  12
  13 ## Class Properties
  14
  15 ### Public Properties
  16
  17 | Property | Type | Description |
  18 |----------|------|-------------|
  19 | `$tls_session` | bool | Indicates if the current session uses HTTPS/TLS encryption |
  20 | `$request_uri` | string | Normalized REQUEST_URI (e.g., 'PageOfNoReturn/show?a=1') |
  21 | `$ip` | string | Client's real IP address (accounts for proxies) |
  22 | `$sess` | Session | Reference to the Session object |
  23 | `$method` | string | Current HTTP method/request type |
  24
  25 ### Private Properties
  26
  27 | Property | Type | Description |
  28 |----------|------|-------------|
  29 | `$db` | object | Database connection reference |
  30 | `$tls_mark` | string | Cookie name for TLS session marking |
  31 | `$page` | string | Current page name being processed |
  32 | `$hash` | string | SHA1 hash of the page name |
  33 | `$query` | string | Encoded query string |
  34 | `$lang` | string | Current language code |
  35 | `$file` | string | Cache file path |
  36 | `$caching` | int | Flag indicating if page should be cached (0 or 1) |
  37
  38 ---
  39
  40 ## Constructor
  41
  42 ```php
  43 public function __construct(&$db)
  44 ```
  45
  46 **Purpose:** Initializes the Http object and sets up HTTP session handling.
  47
  48 **Parameters:**
  49 - `$db` - Database object reference
  50
  51 **Initialization Steps:**
  52 1. Stores database reference
  53 2. Extracts and normalizes REQUEST_URI
  54 3. Detects TLS/HTTPS session status
  55 4. Determines client's real IP address
  56 5. Sets up TLS mark cookie name
  57 6. Enforces TLS session upgrade if needed
  58
  59 **Example:**
  60 ```php
  61 $http = new Http($db);
  62 ```
  63
  64 ---
  65
  66 ## Core Methods
  67
  68 ### Session Management
  69
  70 #### `session($route): void`
  71 Initializes the session handler (file-based or database-based).
  72
  73 **Parameters:**
  74 - `$route` (int) - Routing flag:
  75   - Bit 2 (`$route & 2`): Enable static mode for files/freecap (disables replay prevention and ID regeneration)
  76
  77 **Features:**
  78 - Selects storage backend (file or database)
  79 - Configures cookie settings (security, path, httponly)
  80 - Binds IP and TLS validation
  81 - Recovers diagnostic logs from previous session
  82
  83 **Example:**
  84 ```php
  85 $http->session(0); // Normal session
  86 $http->session(2); // Static file serving mode
  87 ```
  88
  89 ---
  90
  91 ### Caching System
  92
  93 #### `check_cache($page, $method): void`
  94 Determines if a page can be cached and prepares the cache check.
  95
  96 **Parameters:**
  97 - `$page` (string) - Page name to cache
  98 - `$method` (string) - Request method/action (e.g., 'show', 'edit')
  99
  100 **Caching Rules:**
  101 - ✅ Enabled for GET requests only
  102 - ✅ Disabled for POST requests
  103 - ❌ Never cached for 'edit' or 'watch' methods
  104 - ✅ Only cached for anonymous users (no logged-in users)
  105
  106 **Example:**
  107 ```php
  108 $http->check_cache('HomePage', 'show');
  109 ```
  110
  111 ---
  112
  113 #### `store_cache(): void`
  114 Saves the generated page content to cache file.
  115
  116 **Features:**
  117 - Retrieves output buffer content
  118 - Saves to cache file with proper permissions
  119 - Records cache metadata in database
  120 - Only executes if caching flag is set and user is anonymous
  121
  122 **Example:**
  123 ```php
  124 // Called at end of page rendering
  125 $http->store_cache();
  126 ```
  127
  128 ---
  129
  130 #### `invalidate_page($page): int`
  131 Invalidates all cached versions of a page.
  132
  133 **Parameters:**
  134 - `$page` (string) - Page name to invalidate
  135
  136 **Returns:**
  137 - Number of cache entries invalidated
  138
  139 **Process:**
  140 1. Finds all cached versions (different methods/languages)
  141 2. Touches files to past timestamp (faster than deletion)
  142 3. Removes entries from cache metadata table
  143 4. Returns count of invalidated caches
  144
  145 **Example:**
  146 ```php
  147 $count = $http->invalidate_page('HomePage');
  148 echo "Invalidated $count cache entries";
  149 ```
  150
  151 ---
  152
  153 ### TLS/HTTPS Security
  154
  155 #### `secure_base_url(): void`
  156 Switches base URL from HTTP to HTTPS.
  157
  158 **Purpose:**
  159 - Ensures all subsequent URLs use HTTPS
  160 - Stores original HTTP URL for fallback
  161 - Called when TLS session is detected
  162
  163 **Example:**
  164 ```php
  165 $http->secure_base_url();
  166 // $db->base_url now uses https://
  167 ```
  168
  169 ---
  170
  171 #### `ensure_tls($url): void`
  172 Enforces HTTPS for a specific URL and redirects if necessary.
  173
  174 **Parameters:**
  175 - `$url` (string) - URL to secure
  176
  177 **Behavior:**
  178 - If not already HTTPS and TLS is enabled, forces HTTPS redirect
  179 - Handles both relative and absolute URLs
  180 - Converts relative URLs using current server name
  181
  182 **Example:**
  183 ```php
  184 $http->ensure_tls('/secure/payment');
  185 ```
  186
  187 ---
  188
  189 ### IP Address Detection
  190
  191 #### `real_ip(): string` (Private)
  192 Detects client's real IP address accounting for proxies.
  193
  194 **Proxy Headers Checked (in order):**
  195 1. `HTTP_X_CLUSTER_CLIENT_IP`
  196 2. `HTTP_X_FORWARDED_FOR` (or custom header)
  197 3. `HTTP_CLIENT_IP`
  198 4. `HTTP_X_REMOTE_ADDR`
  199 5. `REMOTE_ADDR` (fallback)
  200
  201 **Features:**
  202 - Filters out private/reserved IP ranges
  203 - Respects configured reverse proxy addresses
  204 - Returns `'0.0.0.0'` as fallback
  205
  206 **Configuration in Database:**
  207 - `reverse_proxy_addresses` - Comma/space-separated proxy IPs
  208 - `reverse_proxy_header` - Custom header name (default: `X-Forwarded-For`)
  209
  210 **Example:**
  211 ```php
  212 $client_ip = $http->ip; // e.g., "203.0.113.42"
  213 ```
  214
  215 ---
  216
  217 ### HTTPS Detection
  218
  219 #### `tls_session(): bool` (Private)
  220 Detects if current connection uses HTTPS/TLS.
  221
  222 **Checks (any being true = HTTPS):**
  223 - `$_SERVER['HTTPS']` is 'on'
  224 - `$_SERVER['SERVER_PORT']` is 443
  225 - `$_SERVER['HTTP_X_FORWARDED_PROTO']` is 'https'
  226 - `$_SERVER['HTTP_X_FORWARDED_SSL']` is 'on'
  227 - `$_SERVER['HTTP_X_FORWARDED_PORT']` is 443
  228
  229 ---
  230
  231 ### Security Headers
  232
  233 #### `http_security_headers(): void`
  234 Sets security-related HTTP headers.
  235
  236 **Headers Set:**
  237
  238 | Header | Purpose | Config Key |
  239 |--------|---------|------------|
  240 | Content-Security-Policy | XSS/injection protection | `csp` |
  241 | Permissions-Policy | Control browser features | `permissions_policy` |
  242 | Referrer-Policy | Control referrer information | `referrer_policy` |
  243 | Strict-Transport-Security | Force HTTPS | Auto (TLS only) |
  244 | X-Frame-Options | Clickjacking protection | Hardcoded: `SAMEORIGIN` |
  245 | X-Content-Type-Options | MIME sniffing prevention | Hardcoded: `nosniff` |
  246
  247 **CSP Configuration Options:**
  248 - `0` - Disabled
  249 - `1` - Default policy (from `csp.conf`)
  250 - `2` - Custom policy (from `csp_custom.conf`)
  251
  252 **Example:**
  253 ```php
  254 $http->http_security_headers();
  255 ```
  256
  257 ---
  258
  259 ### HTTP Methods
  260
  261 #### `redirect($url, $permanent = false): void`
  262 Performs an HTTP redirect.
  263
  264 **Parameters:**
  265 - `$url` (string) - Target URL
  266 - `$permanent` (bool) - Use 301 (permanent) vs 302 (temporary)
  267
  268 **Features:**
  269 - Decodes `&` entities to prevent broken redirects
  270 - Only works if headers not yet sent
  271 - Uses output buffering to work anywhere in page processing
  272
  273 **Example:**
  274 ```php
  275 $http->redirect('http://example.com/new-page', true); // 301
  276 $http->redirect('/wiki/HomePage'); // 302
  277 ```
  278
  279 ---
  280
  281 #### `terminate(): void`
  282 Safe exit/die with cleanup.
  283
  284 **Cleanup Operations:**
  285 - Saves diagnostic logs to session flash data
  286 - Ends script execution
  287
  288 **Example:**
  289 ```php
  290 $http->terminate();
  291 ```
  292
  293 ---
  294
  295 #### `status($code): void`
  296 Sets HTTP response status code.
  297
  298 **Supported Status Codes:**
  299 ```php
  300 200 => 'OK'
  301 206 => 'Partial Content'
  302 301 => 'Moved Permanently'
  303 302 => 'Moved Temporarily'
  304 304 => 'Not Modified'
  305 400 => 'Bad Request'
  306 401 => 'Unauthorized'
  307 403 => 'Forbidden'
  308 404 => 'Not Found'
  309 405 => 'Method Not Allowed'
  310 409 => 'Conflict'
  311 410 => 'Gone'
  312 416 => 'Requested Range Not Satisfiable'
  313 500 => 'Internal Server Error'
  314 501 => 'Not Implemented'
  315 503 => 'Service Unavailable'
  316 ```
  317
  318 **Example:**
  319 ```php
  320 $http->status(404); // Send 404 Not Found
  321 ```
  322
  323 ---
  324
  325 ### Caching Control
  326
  327 #### `no_cache($client_only = true): void`
  328 Disables caching of the current page.
  329
  330 **Parameters:**
  331 - `$client_only` (bool, default: TRUE)
  332   - `TRUE`: Disable browser cache only
  333   - `FALSE`: Disable both browser and server cache
  334
  335 **Headers Set:**
  336 - `Last-Modified: <current-time>` (always fresh)
  337 - `Cache-Control: no-store`
  338
  339 **Example:**
  340 ```php
  341 $http->no_cache(); // Client-side only
  342 $http->no_cache(false); // Both client & server
  343 ```
  344
  345 ---
  346
  347 #### `cache_promisc(): void`
  348 Marks page as publicly cacheable.
  349
  350 **Headers Set:**
  351 - `Cache-Control: public`
  352
  353 **Example:**
  354 ```php
  355 $http->cache_promisc();
  356 ```
  357
  358 ---
  359
  360 ### Language Negotiation
  361
  362 #### `user_agent_language(): string`
  363 Determines best language based on browser preferences.
  364
  365 **Features:**
  366 - Follows RFC 9110 section 12.5.4 (HTTP Accept-Language)
  367 - Parses `Accept-Language` header with quality factors
  368 - Attempts exact match first, then language fallback
  369 - Falls back to default system language
  370
  371 **Example Header:**
  372 ```
  373 Accept-Language: en-US,en;q=0.9,de;q=0.8
  374 ```
  375
  376 **Returns:**
  377 - Language code (e.g., 'en', 'en-US', 'de')
  378
  379 ---
  380
  381 #### `available_languages($subset = true): array`
  382 Returns list of available language translations.
  383
  384 **Parameters:**
  385 - `$subset` (bool, default: TRUE)
  386   - `TRUE`: Only allowed languages
  387   - `FALSE`: All available languages
  388
  389 **Features:**
  390 - Scans `LANG_DIR` for language files
  391 - Filters by `allowed_languages` config if set
  392 - Caches result in session
  393 - System language always included
  394
  395 **Returns:**
  396 - Associative array: `['en' => 'en', 'de' => 'de', ...]`
  397
  398 **Example:**
  399 ```php
  400 $all_langs = $http->available_languages(false);
  401 $allowed = $http->available_languages(true);
  402 ```
  403
  404 ---
  405
  406 ### File Serving
  407
  408 #### `sendfile($path, $filename = null, $age = null): void`
  409 Serves files with proper HTTP headers and caching.
  410
  411 **Parameters:**
  412 - `$path` (string) - File path (or HTTP_XXX constant for error pages)
  413 - `$filename` (string, optional) - Custom download filename
  414 - `$age` (int, optional) - Cache age in days
  415
  416 **Features:**
  417 - HTTP range request support (partial file downloads)
  418 - ETag and Last-Modified conditional requests
  419 - Proper MIME type detection
  420 - Content-Security-Policy for special file types
  421 - Streaming for large files
  422 - GZip compression for text files
  423
  424 **Special Paths:**
  425 ```php
  426 $http->sendfile(404); // Serves file defined by HTTP_404 constant
  427 $http->sendfile(403); // Serves file defined by HTTP_403 constant
  428 ```
  429
  430 **Example:**
  431 ```php
  432 $http->sendfile('uploads/document.pdf', 'my-document.pdf', 30);
  433 ```
  434
  435 ---
  436
  437 #### `mime_type($path): string`
  438 Returns MIME type for a file.
  439
  440 **Returns:**
  441 - MIME type string (e.g., 'application/pdf')
  442 - Default: `'application/octet-stream'`
  443
  444 **Example:**
  445 ```php
  446 $mime = $http->mime_type('file.pdf'); // 'application/pdf'
  447 ```
  448
  449 ---
  450
  451 #### `mime_types(): array` (Private)
  452 Loads and caches MIME types from configuration.
  453
  454 **Features:**
  455 - Reads from `config/mime.types`
  456 - Caches to `cache/config/mime.types`
  457 - Reloads if config is updated
  458
  459 ---
  460
  461 ### Compression
  462
  463 #### `gzip(): void`
  464 Compresses HTTP response with gzip/x-gzip.
  465
  466 **Features:**
  467 - Manually implements gzip (not relying on zlib.output_compression)
  468 - Produces correct `Content-Length` header
  469 - Only compresses if:
  470   - 860 bytes < content < 1 MB
  471   - Client accepts compression
  472   - Headers not already sent
  473
  474 **Example:**
  475 ```php
  476 $http->gzip();
  477 ```
  478
  479 ---
  480
  481 ### Utility Methods
  482
  483 #### `parse_str($str): array` (Private)
  484 Parses URL-encoded strings with special character handling.
  485
  486 **Purpose:**
  487 - Safely handles special characters in query/form data
  488 - Converts encoding properly
  489
  490 **Example:**
  491 ```php
  492 $data = $http->parse_str('name=John&age=30');
  493 ```
  494
  495 ---
  496
  497 #### `request_uri(): string` (Private)
  498 Extracts and normalizes REQUEST_URI from server.
  499
  500 **Normalization:**
  501 - Removes base URL prefix
  502 - Removes spaces
  503 - Collapses multiple slashes
  504 - Removes `..` path traversal attempts
  505 - Removes leading/trailing slashes
  506
  507 ---
  508
  509 #### `cut_prefix($prefix, $path): string` (Private)
  510 Removes prefix from path (case-insensitive).
  511
  512 ---
  513
  514 #### `get_header_conf($file_name): string` (Private)
  515 Loads security header configuration from files.
  516
  517 **Files Supported:**
  518 - `csp.conf` / `csp_custom.conf`
  519 - `permissions_policy.conf` / `permissions_policy_custom.conf`
  520
  521 ---
  522
  523 ## Configuration Dependencies
  524
  525 The class relies on these database configuration settings:
  526
  527 | Setting | Type | Purpose |
  528 |---------|------|---------|
  529 | `base_url` | string | Wiki's base URL |
  530 | `tls` | bool | Enable HTTPS enforcement |
  531 | `cache` | bool | Enable page caching |
  532 | `cache_ttl` | int | Cache lifetime in seconds |
  533 | `session_store` | int | 1=File, 0=Database |
  534 | `system_seed_hash` | string | Session encryption seed |
  535 | `cookie_prefix` | string | Session cookie prefix |
  536 | `cookie_path` | string | Cookie path |
  537 | `allow_persistent_cookie` | bool | Allow persistent login |
  538 | `session_length` | int | Session lifetime in seconds |
  539 | `reverse_proxy_addresses` | string | Comma/space-separated proxy IPs |
  540 | `reverse_proxy_header` | string | Custom X-Forwarded header |
  541 | `language` | string | Default language code |
  542 | `multilanguage` | bool | Enable language negotiation |
  543 | `allowed_languages` | string | Comma/space-separated allowed langs |
  544 | `enable_security_headers` | bool | Send security headers |
  545 | `csp` | int | CSP setting (0/1/2) |
  546 | `permissions_policy` | int | Permissions-Policy setting (0/1/2) |
  547 | `referrer_policy` | int | Referrer-Policy setting (0-8) |
  548
  549 ---
  550
  551 ## Constants Used
  552
  553 | Constant | Type | Purpose |
  554 |----------|------|---------|
  555 | `IN_WACKO` | bool | Security check (exit if not defined) |
  556 | `CHMOD_SAFE` | int | File permissions for cache files |
  557 | `CHMOD_FILE` | int | File permissions for config cache |
  558 | `CACHE_PAGE_DIR` | string | Page cache directory |
  559 | `CACHE_SESSION_DIR` | string | Session cache directory |
  560 | `CACHE_CONFIG_DIR` | string | Config cache directory |
  561 | `CONFIG_DIR` | string | Configuration directory |
  562 | `LANG_DIR` | string | Language files directory |
  563 | `DAYSECS` | int | Seconds in a day (86400) |
  564 | `HTTP_404` | string | Path to 404 error page |
  565 | `HTTP_403` | string | Path to 403 error page |
  566
  567 ---
  568
  569 ## Workflow Examples
  570
  571 ### Example 1: Handling a GET Request
  572
  573 ```php
  574 // In main wiki entry point
  575 $http = new Http($db);
  576 $http->session(0); // Start session
  577
  578 // Check if page can be served from cache
  579 $http->check_cache('HomePage', 'show');
  580
  581 // ... render page content ...
  582
  583 // Store rendered page in cache if applicable
  584 $http->store_cache();
  585
  586 // Send security headers
  587 $http->http_security_headers();
  588
  589 // Possibly compress output
  590 $http->gzip();
  591 ```
  592
  593 ### Example 2: Handling TLS/HTTPS Upgrade
  594
  595 ```php
  596 $http = new Http($db); // Constructor detects TLS requirement
  597 // If TLS is enabled and user wasn't in TLS before:
  598 // - Sets TLS session flag
  599 // - Marks session with TLS cookie
  600 // - Redirects to HTTPS version
  601 ```
  602
  603 ### Example 3: Invalidating Cache After Page Edit
  604
  605 ```php
  606 // User edits a page
  607 $http = new Http($db);
  608 $count = $http->invalidate_page('HomePage');
  609 // All cached versions (different languages, methods) are invalidated
  610 ```
  611
  612 ### Example 4: Serving a File
  613
  614 ```php
  615 $http = new Http($db);
  616 $http->session(2); // Static file mode - no session replay prevention
  617
  618 // Serve with 30-day cache
  619 $http->sendfile('uploads/manual.pdf', 'user-manual.pdf', 30);
  620 ```
  621
  622 ---
  623
  624 ## Security Considerations
  625
  626 ### 1. **IP Address Spoofing**
  627 - Validates IPs against private ranges
  628 - Filters proxy-provided IPs appropriately
  629 - Configurable reverse proxy trust
  630
  631 ### 2. **Session Security**
  632 - Binds sessions to IP address
  633 - Binds sessions to TLS status
  634 - Supports both file and database storage
  635 - HttpOnly cookies by default
  636
  637 ### 3. **TLS Enforcement**
  638 - Automatic HTTPS upgrade when configured
  639 - Marks TLS sessions to prevent downgrade attacks
  640 - HSTS header support
  641
  642 ### 4. **Content Security**
  643 - CSP headers to prevent XSS
  644 - X-Frame-Options to prevent clickjacking
  645 - X-Content-Type-Options to prevent MIME sniffing
  646 - Referrer-Policy control
  647 - Permissions-Policy for browser features
  648
  649 ### 5. **File Serving**
  650 - Validates file existence and readability
  651 - Prevents directory traversal via `realpath()`
  652 - Rejects symbolic links
  653 - Special CSP for SVG and PDF files
  654
  655 ### 6. **Cache Security**
  656 - Cached only for anonymous users
  657 - Disabled for sensitive operations (edit, watch)
  658 - Only GET requests cached
  659
  660 ---
  661
  662 ## Performance Optimization
  663
  664 ### 1. **Page Caching**
  665 - Stores full HTML output
  666 - TTL-based expiration
  667 - Language and method-aware caching
  668 - Conditional request support (304 Not Modified)
  669
  670 ### 2. **MIME Type Caching**
  671 - Loads MIME types once and caches
  672 - Regenerates only when config changes
  673
  674 ### 3. **Session Options**
  675 - File-based sessions for simple deployments
  676 - Database sessions for distributed systems
  677
  678 ### 4. **Compression**
  679 - Manual gzip implementation
  680 - Proper Content-Length generation
  681 - Only compresses appropriate sizes
  682
  683 ---
  684
  685 ## Debugging
98 686
99 687 The class integrates with WackoWiki's diagnostic system:
100 688
101   %%php
  689 ```php
102 690 // Diagnostic messages are preserved across redirects
103 691 // via session flash data
104 692
105 693 // Check cached pages (debug comments in output):
106 694 // <!-- WackoWiki Caching Engine: page cached at 2024-01-15 12:30:45 GMT -->
107   %%
108  
109   ----
110  
111   === Related Classes ===
112     - **Session Classes** (##SessionFileStore##, ##SessionDbalStore##) - Session management backends
113     - **Database Class** - Configuration and cache metadata storage
114     - **Ut Utility Class** - String/path utilities
115     - **Diag Class** - Diagnostic logging
116  
117   ----
118  
119   === Version History ===
120     - Supports PHP 8.0+ (uses match expressions, union types)
121     - Follows RFC 9110 for HTTP header handling
122     - Modern cookie security practices
123  
124   ----
125  
126   === Conclusion ===
127  
128   The ##Http## class is the central request/response handler in WackoWiki, managing everything from session initialization to security headers to file serving. Understanding this class is essential for:
129     - Extending WackoWiki with custom request handlers
130     - Implementing custom session logic
131     - Adding new security policies
132     - Optimizing cache strategies
133     - Debugging HTTP-related issues
  695 ```
  696
  697 ---
  698
  699 ## Related Classes
  700
  701 - **Session Classes** (`SessionFileStore`, `SessionDbalStore`) - Session management backends
  702 - **Database Class** - Configuration and cache metadata storage
  703 - **Ut Utility Class** - String/path utilities
  704 - **Diag Class** - Diagnostic logging
  705
  706 ---
  707
  708 ## Version History
  709
  710 - Supports PHP 8.0+ (uses match expressions, union types)
  711 - Follows RFC 9110 for HTTP header handling
  712 - Modern cookie security practices
  713
  714 ---
  715
  716 ## Conclusion
  717
  718 The `Http` class is the central request/response handler in WackoWiki, managing everything from session initialization to security headers to file serving. Understanding this class is essential for:
  719
  720 - Extending WackoWiki with custom request handlers
  721 - Implementing custom session logic
  722 - Adding new security policies
  723 - Optimizing cache strategies
  724 - Debugging HTTP-related issues