Our great sponsors
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libcurl
A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features
Guzzle is specifically a HTTP client, while curl is a more general library supporting many other protocols.
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http-message
The purpose of this PSR is to provide a set of common interfaces for HTTP messages as described in RFC 7230 and RFC 7231
Guzzle implements PSR-7: HTTP message interfaces (but apparently not yet PSR-18: HTTP Client, or at least they don't mention it). That means it's possible to use it in third-party libraries/frameworks and easy to replace with similar tools.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.