Package "ctw/ctw-http"

Utility classes, constants, and typed exceptions for PSR-7 HTTP operations, providing a complete HTTP status code registry with metadata and throwable exceptions for all 4xx/5xx status codes.

Introduction

Why This Library Exists

Working with HTTP in PHP often involves scattered magic numbers, inconsistent error handling, and repetitive exception creation. The PSR-7 standard defines message interfaces but doesn't provide status code constants, metadata, or exception types.

This library provides a complete HTTP toolkit:

• Status code constants: All standard HTTP status codes as class constants
• Method constants: HTTP method names (GET, POST, PUT, DELETE, etc.)
• Status metadata: Human-readable names, descriptions, and documentation URLs
• Typed exceptions: Dedicated exception classes for every 4xx and 5xx status code
• Exception hierarchy: Catch client errors (4xx) or server errors (5xx) separately

Problems This Library Solves

1. Magic numbers: Code uses 404 instead of readable STATUS_NOT_FOUND
2. Inconsistent exceptions: Each project invents its own HTTP exception classes
3. Missing metadata: Status codes lack human-readable descriptions
4. Catch-all handling: No way to catch only client errors vs. server errors
5. Documentation gaps: Developers must look up status code meanings externally

Where to Use This Library

• PSR-7 applications: Enhance HTTP message handling with typed constants
• API development: Throw semantically correct HTTP exceptions
• Error handling middleware: Catch exceptions by category (client/server)
• Logging and monitoring: Include status metadata in error reports
• HTTP clients: Use constants instead of magic numbers

Design Goals

1. PSR-7 aligned: Implements Fig\Http\Message\StatusCodeInterface
2. Complete coverage: All standard HTTP status codes (1xx through 5xx)
3. Rich metadata: Name, phrase, and documentation URL for each status
4. Exception hierarchy: Abstract base classes for client (4xx) and server (5xx) errors
5. Type-safe: Full strict types and interface contracts

Requirements

• PHP 8.3 or higher
• fig/http-message-util ^1.1

Installation

Install by adding the package as a Composer requirement:

composer require ctw/ctw-http

Usage Examples

HTTP Status Metadata

Retrieve complete metadata for any status code:

use Ctw\Http\HttpStatus;

$httpStatus = new HttpStatus(HttpStatus::STATUS_NOT_FOUND);
$entity = $httpStatus->get();

// Returns:
// Ctw\Http\Entity\HttpStatus {
//   +statusCode: 404
//   +name: "Not Found"
//   +phrase: "The requested resource could not be found but may be available again in the future."
//   +exception: "Ctw\Http\HttpException\NotFoundException"
//   +url: "https://httpstatuses.com/404"
// }

Throwing HTTP Exceptions

Each 4xx and 5xx status code has a dedicated exception class:

use Ctw\Http\HttpException;

// Default message uses status name
throw new HttpException\NotFoundException();
// "404 Not Found"

// Custom message
throw new HttpException\NotFoundException('User with ID 123 not found');
// "User with ID 123 not found"

// With custom headers
throw new HttpException\UnauthorizedException(
    message: 'Invalid API key',
    headers: ['WWW-Authenticate' => 'Bearer']
);

Catching Exceptions by Category

The exception hierarchy allows catching by error category:

use Ctw\Http\HttpException;

try {
    // Application code
} catch (HttpException\AbstractClientErrorException $e) {
    // Handle 4xx errors (client's fault)
    $statusCode = $e->getStatusCode();
    $headers = $e->getHeaders();
} catch (HttpException\AbstractServerErrorException $e) {
    // Handle 5xx errors (server's fault)
}

// Or catch all HTTP exceptions
try {
    // Application code
} catch (HttpException\HttpExceptionInterface $e) {
    // Handle any HTTP exception
}

Exception Hierarchy

HttpExceptionInterface
└── AbstractException
    ├── AbstractClientErrorException (4xx)
    │   ├── BadRequestException (400)
    │   ├── UnauthorizedException (401)
    │   ├── ForbiddenException (403)
    │   ├── NotFoundException (404)
    │   └── ... (all 4xx codes)
    └── AbstractServerErrorException (5xx)
        ├── InternalServerErrorException (500)
        ├── NotImplementedException (501)
        ├── BadGatewayException (502)
        ├── ServiceUnavailableException (503)
        └── ... (all 5xx codes)

HTTP Method Constants

use Ctw\Http\HttpMethod;

HttpMethod::METHOD_GET;      // 'GET'
HttpMethod::METHOD_POST;     // 'POST'
HttpMethod::METHOD_PUT;      // 'PUT'
HttpMethod::METHOD_PATCH;    // 'PATCH'
HttpMethod::METHOD_DELETE;   // 'DELETE'
HttpMethod::METHOD_HEAD;     // 'HEAD'
HttpMethod::METHOD_OPTIONS;  // 'OPTIONS'
HttpMethod::METHOD_CONNECT;  // 'CONNECT'
HttpMethod::METHOD_TRACE;    // 'TRACE'
HttpMethod::METHOD_PURGE;    // 'PURGE'

HTTP Status Constants

use Ctw\Http\HttpStatus;

// Informational (1xx)
HttpStatus::STATUS_CONTINUE;              // 100
HttpStatus::STATUS_SWITCHING_PROTOCOLS;   // 101

// Success (2xx)
HttpStatus::STATUS_OK;                    // 200
HttpStatus::STATUS_CREATED;               // 201
HttpStatus::STATUS_ACCEPTED;              // 202
HttpStatus::STATUS_NO_CONTENT;            // 204

// Redirection (3xx)
HttpStatus::STATUS_MOVED_PERMANENTLY;     // 301
HttpStatus::STATUS_FOUND;                 // 302
HttpStatus::STATUS_NOT_MODIFIED;          // 304
HttpStatus::STATUS_TEMPORARY_REDIRECT;    // 307
HttpStatus::STATUS_PERMANENT_REDIRECT;    // 308

// Client Error (4xx)
HttpStatus::STATUS_BAD_REQUEST;           // 400
HttpStatus::STATUS_UNAUTHORIZED;          // 401
HttpStatus::STATUS_FORBIDDEN;             // 403
HttpStatus::STATUS_NOT_FOUND;             // 404
HttpStatus::STATUS_METHOD_NOT_ALLOWED;    // 405
HttpStatus::STATUS_CONFLICT;              // 409
HttpStatus::STATUS_UNPROCESSABLE_ENTITY;  // 422
HttpStatus::STATUS_TOO_MANY_REQUESTS;     // 429

// Server Error (5xx)
HttpStatus::STATUS_INTERNAL_SERVER_ERROR; // 500
HttpStatus::STATUS_NOT_IMPLEMENTED;       // 501
HttpStatus::STATUS_BAD_GATEWAY;           // 502
HttpStatus::STATUS_SERVICE_UNAVAILABLE;   // 503
HttpStatus::STATUS_GATEWAY_TIMEOUT;       // 504

Available Exception Classes

Status	Exception Class
400	BadRequestException
401	UnauthorizedException
402	PaymentRequiredException
403	ForbiddenException
404	NotFoundException
405	MethodNotAllowedException
406	NotAcceptableException
407	ProxyAuthenticationRequiredException
408	RequestTimeoutException
409	ConflictException
410	GoneException
411	LengthRequiredException
412	PreconditionFailedException
413	PayloadTooLargeException
414	RequestUriTooLongException
415	UnsupportedMediaTypeException
416	RangeNotSatisfiableException
417	ExpectationFailedException
418	ImATeapotException
421	MisdirectedRequestException
422	UnprocessableEntityException
423	LockedException
424	FailedDependencyException
425	TooEarlyException
426	UpgradeRequiredException
428	PreconditionRequiredException
429	TooManyRequestsException
431	RequestHeaderFieldsTooLargeException
451	UnavailableForLegalReasonsException
500	InternalServerErrorException
501	NotImplementedException
502	BadGatewayException
503	ServiceUnavailableException
504	GatewayTimeoutException
505	VersionNotSupportedException
506	VariantAlsoNegotiatesException
507	InsufficientStorageException
508	LoopDetectedException
510	NotExtendedException
511	NetworkAuthenticationRequiredException