Your requirements could not be resolved to an installable set of packages.
Problem 1
- Root composer.json requires ecphp/cas-bundle ^3.0 -> satisfiable by ecphp/cas-bundle[3.0.0, 3.0.1].
- ecphp/cas-bundle[3.0.0, ..., 3.0.1] require ecphp/cas-lib ^3 -> satisfiable by ecphp/cas-lib[3.0.0, 3.0.1].
- ecphp/cas-lib[3.0.0, ..., 3.0.1] require psr/http-client-implementation ^1 -> could not be found in any version, but the following packages provide it:
- guzzlehttp/guzzle Guzzle is a PHP HTTP client library
- symfony/http-client Provides powerful methods to fetch HTTP resources synchronously or asynchronously
- php-http/discovery Finds and installs PSR-7, PSR-17, PSR-18 and HTTPlug implementations
- php-http/guzzle7-adapter Guzzle 7 HTTP Adapter
- php-http/curl-client PSR-18 and HTTPlug Async client with cURL
- php-http/guzzle6-adapter Guzzle 6 HTTP Adapter
- symfony/symfony The Symfony PHP framework
- cakephp/cakephp The CakePHP framework
- typo3/cms-core TYPO3 CMS Core
- kriswallsmith/buzz Lightweight HTTP client
- php-http/mock-client Mock HTTP client
- nimbly/shuttle Simple PSR-18 HTTP client.
- php-http/socket-client Socket client for PHP-HTTP
- multisafepay/magento2-core MultiSafepay core module for Magento 2
- byjg/webrequest A lightweight and highly customized CURL wrapper for making RESt calls and a wrapper for call dynami
... and 107 more.
Consider requiring one of these to satisfy the psr/http-client-implementation requirement.
Potential causes:
- A typo in the package name
- The package is not available in a stable-enough version according to your minimum-stability setting
see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details.
- It's a private package and you forgot to add a custom repository to find it
Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.