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Guzzle, commonly referred to as guzzlehttp/guzzle, is a PHP HTTP client library. It provides a simple interface to send HTTP requests and integrate with web services. It is maintained by the Guzzle project and the wider PHP community, with the package name guzzlehttp/guzzle on Packagist.

The library offers synchronous and asynchronous requests, streaming, cookies, redirects, authentication, and automatic retries. Its architecture is middleware-based, using a handler stack that lets developers modify requests and responses through middleware. The default handler uses cURL or PHP streams as transport layers. Guzzle supports PSR-7 HTTP message interfaces and can interact with PSR-18 HTTP clients and PSR-17 factories.

Guzzle is installed via Composer with the command composer require guzzlehttp/guzzle. A client is created with configuration options such as base_uri, and requests are issued using methods like get, post, or a general request method. Responses are represented as PSR-7 ResponseInterface objects.

The library is widely used in the PHP ecosystem and serves as the underlying HTTP client in many frameworks and projects, including Laravel and Symfony. It has a broad ecosystem of related packages for PSR-7 support, middleware, and adapters, and it emphasizes backward compatibility and active maintenance.

Guzzle has evolved through multiple major versions to align with PHP language changes and modern standards. It is open-source software released under the MIT license, with ongoing maintenance and community contributions. The project ferries ongoing development and improvements through its public repository and community input.