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curl is a command-line tool and library for transferring data with URLs and supports many protocols (HTTP, HTTPS, FTP, SFTP, etc.). It is commonly used for API testing, automating transfers, and scripting network interactions. curl emphasizes portability, standards compliance, and flexible authentication and transfer options.
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curl is a command-line tool and library for transferring data through URLs. It supports HTTP and many other protocols and makes network calls scriptable.
Daniel Stenberg started the project in 1998, and libcurl became a widely embedded transfer library.
A call combines URL, method, headers, authentication, and body. curl resolves names, establishes transport and TLS, sends the request, and separates body from diagnostics. Exit codes and formatting options make results testable in scripts.
Options describe protocol, headers, data, and authentication.
libcurl handles connection, TLS, redirects, and protocol details.
Exit status and structured output integrate checks into shell and CI.
curl is ideal for API diagnosis, downloads, and small smoke checks. Careless output can expose secrets, and successful transfer proves neither business correctness nor browser rendering.
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