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265b14d6b3
Warning: this will make existing curl command lines that use metalink to stop working. Reasons for removal: 1. We've found several security problems and issues involving the metalink support in curl. The issues are not detailed here. When working on those, it become apparent to the team that several of the problems are due to the system design, metalink library API and what the metalink RFC says. They are very hard to fix on the curl side only. 2. The metalink usage with curl was only very briefly documented and was not following the "normal" curl usage pattern in several ways, making it surprising and non-intuitive which could lead to further security issues. 3. The metalink library was last updated 6 years ago and wasn't so active the years before that either. An unmaintained library means there's a security problem waiting to happen. This is probably reason enough. 4. Metalink requires an XML parsing library, which is complex code (even the smaller alternatives) and to this day often gets security updates. 5. Metalink is not a widely used curl feature. In the 2020 curl user survey, only 1.4% of the responders said that they'd are using it. In 2021 that number was 1.2%. Searching the web also show very few traces of it being used, even with other tools. 6. The torrent format and associated technology clearly won for downloading large files from multiple sources in parallel. Cloes #7176
80 lines
2.4 KiB
D
80 lines
2.4 KiB
D
Long: version
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Short: V
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Help: Show version number and quit
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Category: important curl
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---
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Displays information about curl and the libcurl version it uses.
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The first line includes the full version of curl, libcurl and other 3rd party
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libraries linked with the executable.
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The second line (starts with "Protocols:") shows all protocols that libcurl
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reports to support.
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The third line (starts with "Features:") shows specific features libcurl
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reports to offer. Available features include:
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.RS
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.IP "alt-svc"
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Support for the Alt-Svc: header is provided.
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.IP "AsynchDNS"
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This curl uses asynchronous name resolves. Asynchronous name resolves can be
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done using either the c-ares or the threaded resolver backends.
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.IP "brotli"
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Support for automatic brotli compression over HTTP(S).
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.IP "CharConv"
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curl was built with support for character set conversions (like EBCDIC)
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.IP "Debug"
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This curl uses a libcurl built with Debug. This enables more error-tracking
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and memory debugging etc. For curl-developers only!
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.IP "gsasl"
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The built-in SASL authentication includes extensions to support SCRAM because
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libcurl was built with libgsasl.
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.IP "GSS-API"
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GSS-API is supported.
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.IP "HSTS"
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HSTS support is present.
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.IP "HTTP2"
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HTTP/2 support has been built-in.
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.IP "HTTP3"
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HTTP/3 support has been built-in.
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.IP "HTTPS-proxy"
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This curl is built to support HTTPS proxy.
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.IP "IDN"
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This curl supports IDN - international domain names.
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.IP "IPv6"
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You can use IPv6 with this.
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.IP "Kerberos"
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Kerberos V5 authentication is supported.
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.IP "Largefile"
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This curl supports transfers of large files, files larger than 2GB.
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.IP "libz"
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Automatic decompression (via gzip, deflate) of compressed files over HTTP is
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supported.
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.IP "MultiSSL"
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This curl supports multiple TLS backends.
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.IP "NTLM"
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NTLM authentication is supported.
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.IP "NTLM_WB"
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NTLM delegation to winbind helper is supported.
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.IP "PSL"
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PSL is short for Public Suffix List and means that this curl has been built
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with knowledge about "public suffixes".
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.IP "SPNEGO"
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SPNEGO authentication is supported.
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.IP "SSL"
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SSL versions of various protocols are supported, such as HTTPS, FTPS, POP3S
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and so on.
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.IP "SSPI"
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SSPI is supported.
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.IP "TLS-SRP"
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SRP (Secure Remote Password) authentication is supported for TLS.
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.IP "TrackMemory"
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Debug memory tracking is supported.
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.IP "Unicode"
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Unicode support on Windows.
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.IP "UnixSockets"
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Unix sockets support is provided.
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.IP "zstd"
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Automatic decompression (via zstd) of compressed files over HTTP is supported.
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.RE
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