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Duyler HTTP Server

Non-blocking HTTP server for Duyler Framework worker mode with full PSR-7 support.

Features

Core Features

  • Non-blocking I/O - Works seamlessly with Duyler Event Bus MainCyclic state
  • PSR-7 Compatible - Full support for PSR-7 HTTP messages
  • Request ID Mechanism - Unique request identifiers for parallel processing and request tracking
  • Parallel Processing - Concurrent request handling with Fibers and out-of-order responses
  • HTTP & HTTPS - Support for both HTTP and HTTPS protocols
  • WebSocket Support - RFC 6455 compliant WebSocket implementation with zero-cost abstraction
  • File Upload/Download - Complete multipart form-data and file streaming support
  • Static Files - Built-in static file serving with LRU caching
  • Keep-Alive - HTTP persistent connections support
  • Range Requests - Partial content support for large file downloads
  • Rate Limiting - Sliding window rate limiter with configurable limits
  • Graceful Shutdown - Clean server termination with timeout
  • Server Metrics - Built-in performance and health monitoring
  • High Performance - Optimized for long-running worker processes

Requirements

  • PHP 8.4 or higher
  • ext-sockets (usually pre-installed)

Installation

composer require duyler/http-server

Quick Start

Basic HTTP Server (Standalone)

use Duyler\HttpServer\Server;
use Duyler\HttpServer\Config\ServerConfig;
use Nyholm\Psr7\Response;

$config = new ServerConfig(
    host: '0.0.0.0',
    port: 8080,
);

$server = new Server($config);

// Check if server started successfully
if (!$server->start()) {
    die('Failed to start HTTP server');
}

// In your event loop
while (true) {
    if ($server->hasRequest()) {
        $requestData = $server->getRequest();
        
        // Check for null (race condition or error)
        if ($requestData === null) {
            continue;
        }
        
        // Process request
        $response = new Response(200, [], 'Hello World!');
        
        // Send response with request binding
        $server->respond($requestData->respond($response));
    }
    
    // Do other work...
}

Configuration

ServerConfig Options

use Duyler\HttpServer\Config\ServerConfig;

$config = new ServerConfig(
    // Network
    host: '0.0.0.0',              // Bind address (IP or hostname)
    port: 8080,                    // Bind port (1-65535)
    socketBacklog: 511,            // TCP backlog queue size
    maxAcceptsPerCycle: 10,        // Max new connections per event cycle
    
    // SSL/TLS
    ssl: false,                    // Enable HTTPS
    sslCert: null,                 // Path to SSL certificate file
    sslKey: null,                  // Path to SSL private key file
    
    // Static Files
    publicPath: null,              // Path to public directory for static serving
    enableStaticCache: true,       // Enable in-memory static file cache
    staticCacheSize: 52428800,     // Max cache size (50MB)
    
    // Timeouts
    requestTimeout: 30,            // Request timeout in seconds
    connectionTimeout: 60,         // Connection timeout in seconds
    
    // Limits
    maxConnections: 1000,          // Maximum concurrent connections
    maxRequestSize: 10485760,      // Max request body size (10MB)
    bufferSize: 8192,              // Read buffer size in bytes
    headerCacheLimit: 100,         // Max cached header strings
    memoryLimit: 134217728,        // Memory limit in bytes (128MB)
    
    // Keep-Alive
    enableKeepAlive: true,         // Enable HTTP persistent connections
    keepAliveTimeout: 30,          // Keep-alive timeout in seconds
    keepAliveMaxRequests: 100,     // Max requests per keep-alive connection
    
    // Rate Limiting
    enableRateLimit: false,        // Enable rate limiting per IP
    rateLimitRequests: 100,        // Max requests per window
    rateLimitWindow: 60,           // Rate limit window in seconds
    
    // Security (see Security Configuration section for details)
    enableCors: false,
    contentSecurityPolicy: null,
    contentSecurityPolicyReportOnly: null,
    enableCspNonce: false,
    enableHsts: false,
    hstsMaxAge: 31536000,
    hstsIncludeSubDomains: false,
    hstsPreload: false,
    enableSecurityHeaders: true,
    frameOptions: 'DENY',
    referrerPolicy: 'strict-origin-when-cross-origin',
    permissionsPolicy: 'geolocation=(), microphone=(), camera=()',
    
    // Debug
    debugMode: false,              // Enable debug logging mode
);

Security Configuration

CORS (Cross-Origin Resource Sharing)

$config = new ServerConfig(
    enableCors: true,
    corsAllowedOrigins: ['https://example.com', 'https://app.example.com'],
    corsAllowedMethods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'],
    corsAllowedHeaders: ['Content-Type', 'Authorization', 'X-Requested-With'],
    corsAllowCredentials: false,
    corsMaxAge: 86400,
    corsExposeHeaders: ['X-Custom-Header'],
);
Parameter Type Default Description
enableCors bool false Enable CORS handling
corsAllowedOrigins list<string> [] Allowed origin URLs (required when enabled)
corsAllowedMethods list<string> ['GET','POST','PUT','DELETE','OPTIONS'] Allowed HTTP methods
corsAllowedHeaders list<string> ['Content-Type','Authorization'] Allowed request headers
corsAllowCredentials bool false Allow cookies/auth headers (incompatible with wildcard origin)
corsMaxAge int 86400 Preflight cache duration in seconds
corsExposeHeaders list<string> [] Headers exposed to JavaScript

Content Security Policy (CSP)

$config = new ServerConfig(
    contentSecurityPolicy: [
        'default-src' => ["'self'"],
        'script-src' => ["'self'", "'nonce-{{NONCE}}'"],
        'style-src' => ["'self'", "'unsafe-inline'"],
        'img-src' => ["'self'", 'data:', 'https:'],
        'connect-src' => ["'self'", 'wss://example.com'],
    ],
    enableCspNonce: true,
);
Parameter Type Default Description
contentSecurityPolicy ?array null CSP directives as key-value map
contentSecurityPolicyReportOnly ?array null Report-only CSP directives
enableCspNonce bool false Generate per-request CSP nonce (placeholder: {{NONCE}})

HTTP Strict Transport Security (HSTS)

$config = new ServerConfig(
    ssl: true,
    enableHsts: true,
    hstsMaxAge: 31536000,
    hstsIncludeSubDomains: true,
    hstsPreload: false,
);
Parameter Type Default Description
enableHsts bool false Enable HSTS header
hstsMaxAge int 31536000 Max-age in seconds (1 year default)
hstsIncludeSubDomains bool false Include all subdomains
hstsPreload bool false Opt-in to browser HSTS preload lists

Permissions Policy

$config = new ServerConfig(
    permissionsPolicy: 'geolocation=(), microphone=(), camera=(), payment=(self)',
);

Other Security Headers

The server automatically adds these headers when enableSecurityHeaders is true (default):

Header Default Value
X-Content-Type-Options nosniff
X-Frame-Options DENY (configurable: DENY or SAMEORIGIN)
X-XSS-Protection 1; mode=block
Referrer-Policy strict-origin-when-cross-origin 
$config = new ServerConfig(
    enableSecurityHeaders: true,
    frameOptions: 'SAMEORIGIN',
    referrerPolicy: 'strict-origin-when-cross-origin',
);

Architecture Overview

Request Processing Pipeline

Client Request
      |
      v
+-------------+     +------------------+     +----------------+
|   Server    |---->|  ConnectionPool  |---->|  HttpParser    |
|  (accept)   |     |  (manage conns)  |     |  (parse HTTP)  |
+-------------+     +------------------+     +----------------+
                                                      |
                                                      v
                         +------------------+     +----------------+
                         |  CorsService     |---->|  RateLimiter   |
                         |  (CORS check)    |     |  (throttle)    |
                         +------------------+     +----------------+
                                                      |
                                                      v
                         +------------------+     +----------------+
                         | SecurityHeaders  |---->|  AuditLogger   |
                         |  (add headers)   |     |  (log request) |
                         +------------------+     +----------------+
                                                      |
                                                      v
                         +------------------+     +----------------+
                         |  RequestQueue    |---->| ResponseSender |
                         |  (enqueue)       |     |  (send)        |
                         +------------------+     +----------------+
                                                      |
                                                      v
                                              Client Response

Component Responsibilities

Component Responsibility
Server Entry point. Accepts connections, delegates to processor
HttpRequestProcessor Orchestrates request lifecycle: read, parse, security check, enqueue
ConnectionPool Manages connection lifecycle, enforces max connections
RequestQueue Thread-safe request queue with ID-based response mapping
ResponseSender Writes HTTP responses back to client connections
ClientIpResolver Resolves real client IP from X-Forwarded-For chain
CorsService Validates CORS requests and adds response headers
SecurityHeadersService Adds CSP, HSTS, X-Frame-Options, Permissions-Policy
RateLimiter Sliding window rate limiting per client IP
AuditLogger PSR-3 audit logging for security events

ServerInterface Decomposition

                    ServerInterface
                         |
         +---------------+---------------+
         |               |               |
RequestLifecycle   ServerLifecycle   Metrics
    Interface          Interface      Interface
         |
WorkerPoolIntegration
      Interface
  • RequestLifecycleInterface -- hasRequest(), getRequest(), respond(), hasPendingResponse()
  • ServerLifecycleInterface -- start(), stop(), reset(), restart(), shutdown()
  • WorkerPoolIntegrationInterface -- setWorkerId(), addExternalConnection(), enableNotification(), getSocketResource()
  • MetricsInterface -- getMetrics()

WebSocket Pipeline

HTTP Upgrade Request
         |
         v
+------------------+
|    Handshake     | (validate Origin, compute accept key)
+------------------+
         |
         v
+------------------+
| WebSocketHandler | (frame parsing, message dispatch)
+------------------+
         |
         v
+------------------+
| WebSocketServer  | (connection management, broadcast)
+------------------+
         |
    +----+----+
    |         |
    v         v
  onMessage  onClose
    |         |
    v         v
 Connection  Cleanup

Worker Pool Integration

+-------------------+
|  Worker Pool      |
|  Master Process   |
+-------------------+
         |
    +----+----+----+
    |         |    |
    v         v    v
+--------+ +--------+ +--------+
|Worker 1| |Worker 2| |Worker N|
| Server | | Server | | Server |
+--------+ +--------+ +--------+
    |         |         |
    +----Shared Socket Pool----+
              |
              v
        Client Requests

Advanced Usage

HTTPS Server

$config = new ServerConfig(
    host: '0.0.0.0',
    port: 443,
    ssl: true,
    sslCert: '/path/to/certificate.pem',
    sslKey: '/path/to/private-key.pem',
);

$server = new Server($config);
$server->start();

WebSocket Server

use Duyler\HttpServer\WebSocket\WebSocketServer;
use Duyler\HttpServer\WebSocket\WebSocketConfig;
use Duyler\HttpServer\WebSocket\Connection;
use Duyler\HttpServer\WebSocket\Message;

// Secure by default - origin validation is enabled
$wsConfig = new WebSocketConfig(
    maxMessageSize: 1048576,
    pingInterval: 30,
    // validateOrigin defaults to true for security
    // allowedOrigins defaults to ['*'] - customize for your domains
);

$ws = new WebSocketServer($wsConfig);

$ws->on('connect', function (Connection $conn) {
    echo "New connection: {$conn->getId()}\n";
});

$ws->on('message', function (Connection $conn, Message $message) {
    $data = $message->getJson();
    
    $conn->send([
        'type' => 'echo',
        'data' => $data,
    ]);
});

$ws->on('close', function (Connection $conn, int $code, string $reason) {
    echo "Connection closed: $code\n";
});

$server->attachWebSocket('/ws', $ws);
$server->start();

while (true) {
    if ($server->hasRequest()) {
        $requestData = $server->getRequest();
        
        if ($requestData !== null) {
            $response = new Response(200, [], 'Hello');
            $server->respond($requestData->respond($response));
        }
    }
    
    usleep(1000);
}

Public WebSocket Endpoints

For public WebSocket endpoints that accept connections from any origin:

// WARNING: This configuration is insecure and exposes your WebSocket
// to CSRF attacks. Only use for truly public endpoints.
$wsConfig = new WebSocketConfig(
    validateOrigin: false, // Explicit opt-out of origin validation
    allowedOrigins: ['*'], // Explicit wildcard
);

See examples/websocket-chat.php for a complete chat application example.

Static File Serving

use Duyler\HttpServer\Handler\StaticFileHandler;

$staticHandler = new StaticFileHandler(
    publicPath: '/path/to/public',
    enableCache: true,
    maxCacheSize: 52428800, // 50MB
);

while (true) {
    if ($server->hasRequest()) {
        $request = $server->getRequest();
        
        // Try to serve static file first
        $response = $staticHandler->handle($request->request);
        
        if ($response === null) {
            // Not a static file, handle dynamically
            $response = handleDynamicRequest($request->request);
        }
        
        $server->respond($request->respond($response));
    }
}

File Download

use Duyler\HttpServer\Handler\FileDownloadHandler;

$fileHandler = new FileDownloadHandler();

$response = $fileHandler->download(
    filePath: '/path/to/file.pdf',
    filename: 'document.pdf',
    mimeType: 'application/pdf'
);

$server->respond($requestData->respond($response));

File Upload

// Uploads are automatically parsed from multipart/form-data
$request = $server->getRequest();

$uploadedFiles = $request->getUploadedFiles();

foreach ($uploadedFiles as $field => $file) {
    /** @var \Psr\Http\Message\UploadedFileInterface $file */
    
    if ($file->getError() === UPLOAD_ERR_OK) {
        $file->moveTo('/path/to/uploads/' . $file->getClientFilename());
    }
}

Graceful Shutdown

$server = new Server(new ServerConfig());
$server->start();

// Register shutdown handler
pcntl_signal(SIGTERM, function() use ($server) {
    $success = $server->shutdown(30); // 30 second timeout
    exit($success ? 0 : 1);
});

while (true) {
    if ($server->hasRequest()) {
        $requestData = $server->getRequest();
        $response = new Response(200, [], 'OK');
        $server->respond($requestData->respond($response));
    }
}

Server Metrics

$server = new Server(new ServerConfig());
$server->start();

// Get metrics periodically
$metrics = $server->getMetrics();
// [
//     'uptime_seconds' => 3600,
//     'total_requests' => 10000,
//     'successful_requests' => 9850,
//     'failed_requests' => 150,
//     'active_connections' => 5,
//     'total_connections' => 10050,
//     'closed_connections' => 10045,
//     'timed_out_connections' => 10,
//     'cache_hits' => 8500,
//     'cache_misses' => 1500,
//     'cache_hit_rate' => 85.0,
//     'avg_request_duration_ms' => 12.3,
//     'min_request_duration_ms' => 1.2,
//     'max_request_duration_ms' => 450.5,
//     'requests_per_second' => 2.78,
// ]

API Reference

Server

Methods

  • start(): bool - Start the server (returns false on failure)
  • stop(): void - Stop the server
  • shutdown(int $timeout): bool - Graceful shutdown with timeout
  • reset(): void - Reset the server state
  • restart(): void - Restart the server
  • hasRequest(): bool - Check if there's a pending request (non-blocking)
  • getRequest(): ?RequestData - Get the next request with unique ID (null if unavailable)
  • hasPendingResponse(): bool - Check needs respond
  • respond(ResponseData): void - Send response bound to request via ID
  • getMetrics(): array - Get server performance metrics
  • setLogger(LoggerInterface) - Set external Logger
  • attachWebSocket(string $path, WebSocketServer $ws): void - Attach WebSocketServer
  • addExternalConnection(Socket $clientSocket, array $metadata): void - Add external connection from Worker Pool
  • getSocketResource(): mixed - Get socket resource for Event Loop integration
  • setExternalSocketResource(mixed $resource): void - Set external socket resource for Worker Pool mode
  • enableNotification(): void - Enable notification socket pair for reactive Event Loop
  • disableNotification(): void - Disable notification mechanism
  • setEventLoopActive(bool $active): void - Set Event Loop active flag
  • isEventLoopActive(): bool - Get Event Loop active flag

RequestData

final readonly class RequestData
{
    public string $id;                      // Unique request identifier (e.g., "req_1")
    public ServerRequestInterface $request; // PSR-7 server request
    public int $connectionId;               // Internal connection ID
    
    public function respond(ResponseInterface $response): ResponseData;
}

ResponseData

final readonly class ResponseData
{
    public string $requestId;             // ID of the request this response belongs to
    public ResponseInterface $response;   // PSR-7 response object
}

StaticFileHandler

Methods

  • handle(ServerRequestInterface): ?ResponseInterface - Handle static file request
  • getCacheStats(): array - Get cache statistics
  • clearCache(): void - Clear the cache

FileDownloadHandler

Methods

  • download(string $filePath, ?string $filename, ?string $mimeType): ResponseInterface
  • downloadRange(string $filePath, int $start, int $end, ...): ResponseInterface
  • parseRangeHeader(string $rangeHeader, int $fileSize): ?array

Request ID Mechanism

The HTTP Server uses a Request ID mechanism that enables parallel request processing and out-of-order responses.

Overview

Each HTTP request receives a unique identifier (e.g., req_1, req_2). This ID binds the request to its response, enabling:

  • Parallel processing - Multiple requests can be processed concurrently using Fibers
  • Out-of-order responses - Fast requests don't have to wait for slow ones
  • Request tracking - Each request can be logged and traced via its unique ID

How It Works

┌─────────────┐
│HTTP Request │
└──────┬──────┘
       │
       ▼
┌─────────────────────────┐
│ getRequest()            │
│                         │
│ Returns: RequestData {  │
│   id: "req_1"           │
│   request: ServerRequest│
│   connectionId: 42      │
│ }                       │
└──────┬──────────────────┘
       │
       ▼
┌─────────────────────────┐
│ Your Application Logic  │
│                         │
│ - Process request       │
│ - Create response       │
└──────┬──────────────────┘
       │
       ▼
┌─────────────────────────┐
│ respond()               │
│                         │
│ $requestData->          │
│   respond($response)    │
│                         │
│ Binds response to       │
│ request via ID          │
└──────┬──────────────────┘
       │
       ▼
┌──────────────┐
│HTTP Response │
└──────────────┘

Basic Usage

while ($server->hasRequest()) {
    $requestData = $server->getRequest();
    
    if ($requestData === null) {
        continue;
    }
    
    // Access request data
    $requestId = $requestData->id;              // "req_1"
    $request = $requestData->request;           // PSR-7 request
    $connectionId = $requestData->connectionId; // Internal ID
    
    // Process request
    $response = new Response(200, [], 'OK');
    
    // Send response (bound to request via ID)
    $server->respond($requestData->respond($response));
}

Parallel Processing

Process multiple requests concurrently using Fibers:

$actors = [];

while (true) {
    if (!$server->hasRequest()) {
        // Resume suspended actors
        foreach ($actors as $key => $fiber) {
            if ($fiber->isTerminated()) {
                unset($actors[$key]);
                continue;
            }
            
            if ($fiber->isSuspended()) {
                $fiber->resume();
            }
        }
        
        usleep(1000);
        continue;
    }
    
    $requestData = $server->getRequest();
    
    if ($requestData === null) {
        continue;
    }
    
    // Create actor (Fiber) for parallel processing
    $fiber = new Fiber(function() use ($server, $requestData): void {
        // Simulate slow operation
        usleep(random_int(100000, 1000000));
        
        $response = new Response(200, [], 'Processed');
        
        // Response can be sent in ANY order
        $server->respond($requestData->respond($response));
    });
    
    $fiber->start();
    $actors[] = $fiber;
}

Benefits:

  • Slow requests don't block fast requests
  • Better resource utilization
  • Improved throughput for mixed workloads

Examples

See the following examples for different use cases:

  • Basic usage: examples/request-id-basic.php - Simple sequential processing
  • Parallel processing: examples/parallel-processing.php - Concurrent request handling with Fibers

Performance

Metric Value
Request ID generation ~0.01μs (sequential integer)
RequestData creation ~0.1μs
Memory per request ~164 bytes
Overhead for 10K requests ~1.6ms time, ~1.6MB memory

Conclusion: Negligible overhead for production use.

Reactive Event Loop

HTTP Server supports reactive Event Loop through Notification Socket Pair. Event Loop wakes up only when an HTTP request has been accepted and parsed, without polling overhead.

Overview

Traditional polling approach wastes CPU cycles checking for requests that may not exist. The Notification Socket Pair provides true reactive behavior:

Traditional (Polling):
  Event Loop → hasRequest() → false → sleep → repeat (wastes CPU)

Reactive (Notification):
  Event Loop sleeps → Request arrives → Server notifies → Event Loop wakes up

How It Works

┌─────────────────────────────────────────────────────────────────────────┐
│                          Event Loop Process                              │
│                                                                          │
│  EvIo watcher monitors notification socket (sleeps until notified)       │
│                                                                          │
│  notifyRead ◄─────────────────────────────────────────────────────────   │
│                                                                          │
└─────────────────────────────────────────────────────────────────────────┘
                                    ▲
                                    │ write notification (~1μs)
                                    │
┌─────────────────────────────────────────────────────────────────────────┐
│                              Server                                      │
│                                                                          │
│  1. Accept connection                                                   │
│  2. Read HTTP data                                                      │
│  3. Parse request                                                       │
│  4. Enqueue request → NOTIFY EVENT LOOP                                 │
│                                                                          │
└─────────────────────────────────────────────────────────────────────────┘

Standalone Mode

use Duyler\HttpServer\Config\ServerConfig;
use Duyler\HttpServer\Server;
use Nyholm\Psr7\Response;
use Socket;

$config = new ServerConfig(host: '0.0.0.0', port: 8080);
$server = new Server($config);
$server->start();

// Enable notification mechanism
$server->enableNotification();

// Get notification socket for EvIo
$notifySocket = $server->getSocketResource();

$ioWatcher = new EvIo($notifySocket, Ev::READ, function() use ($server): void {
    // Clear notification buffer
    // Non-blocking socket may have no data, suppress expected errors
    $socket = $server->getSocketResource();
    if ($socket instanceof Socket) {
        $previousErrorReporting = error_reporting(0);
        socket_read($socket, 4096);
        error_reporting($previousErrorReporting);
    }
    
    // Set active flag (prevents redundant notifications)
    $server->setEventLoopActive(true);
    
    try {
        // Process all ready requests
        while ($server->hasRequest()) {
            $requestData = $server->getRequest();
            if ($requestData === null) {
                break;
            }
            
            $response = new Response(200, [], 'Hello World!');
            $server->respond($requestData->respond($response));
        }
    } finally {
        // Clear active flag
        $server->setEventLoopActive(false);
    }
});

Ev::run();

Best Practices

  1. Always set active flag - prevents redundant notifications while processing
  2. Clear notification buffer - read all data from socket when waking up
  3. Process all requests - use while loop until hasRequest() returns false
  4. Use try/finally - guarantees active flag is cleared even on errors

Performance

Metric Traditional Polling Reactive Notification
CPU in idle Periodic wakeups Zero overhead
Wakeup latency Up to polling interval ~1μs notification
Scalability Constant overhead One watcher for any connections
  • Zero overhead in idle - Event Loop sleeps until request arrives
  • Minimal overhead - single socket write (~1μs)
  • Scalability - one watcher regardless of connection count

Examples

The examples/ directory contains various usage examples:

Basic Examples

  • request-id-basic.php - Simple HTTP server with Request ID mechanism (beginner-friendly)

Advanced Examples

  • parallel-processing.php - Parallel request processing with Fibers and out-of-order responses
  • reactive-event-loop.php - Reactive Event Loop with Notification Socket Pair
  • evio-integration.php - EvIo integration with reactive Event Loop

Feature Examples

  • websocket-chat.php - WebSocket chat application

Testing

# Run all tests
composer test

# Run with coverage (requires Xdebug or pcov)
composer test:coverage

# Run PHPStan
composer phpstan

Performance Tips

  1. Enable Keep-Alive - Reduces connection overhead for multiple requests
  2. Use Static Cache - Cache frequently accessed static files in memory
  3. Adjust Buffer Size - Increase for high-throughput scenarios
  4. Set Appropriate Timeouts - Balance between responsiveness and resource usage
  5. Limit Max Connections - Prevent resource exhaustion

Worker Pool

For production multi-process deployment with process management, load balancing, and IPC, use the separate duyler/worker-pool package. It integrates seamlessly with this HTTP Server.

Roadmap

Version 1.0 (In Progress)

  • WebSocket - RFC 6455 compliant implementation
  • PSR-3 Logger integration
  • Notification Socket Pair for reactive Event Loop
  • Enhanced documentation

Future Versions

  • HTTP/2 support
  • gRPC support

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

The MIT License (MIT). Please see License File for more information.

Support

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Non-blocking PSR-7 HTTP server for Duyler Framework.

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