New in Symfony 5.1: Portable HTTP/2 implementation
Symfony HttpClient component has provided full HTTP/2 support since day one when the cURL PHP extension was installed on your machine. In Symfony 5.1 we've improved the HTTP client to provide a portable HTTP/2 implementation which doesn't require installing cURL.
The amphp/http-client library provides an async HTTP/1.1+2 client for PHP
based on Amp (a non-blocking concurrency framework for PHP applications).
amphp/http-client manually implements HTTP over TCP sockets, so it has
no dependency on the cURL extension.
In Symfony 5.1, Symfony HttpClient has been improved to detect not only cURL but also the Amp HTTP client. Therefore, HTTP/2 is enabled if one of the following tools is installed:
libcurllibrary version 7.36 or higher;
amphp/http-clientPHP package version 4.2 or higher.
You won't need to do or configure anything else. Just upgrade to Symfony 5.1,
amphp/http-client and you'll have a portable HTTP/2 implementation.
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