520 lines (467 loc) · 105 KB

Index

A

Accept-Encoding: About content encodings, Conditional lines
--alt-svc: Enable
--anyauth: Authentication
--append: trurl example command lines, FTP and SFTP uploads, Uploading with FTP
apt: Ubuntu and Debian
Arch Linux: Arch Linux
AWS sigv4: AWS sigv4
AWS-LC: TLS libraries, Restrictions, HTTP/3 backends
--aws-sigv4: AWS sigv4

B

-b: Cookie engine, Reading cookies from file, Writing cookies to file, New cookie session, Web logins and sessions
--basic: Authentication
BearSSL: lib/vtls, TLS libraries, <features>
bindings: Confusions and mix-ups, libcurl, the library, In website backends, docs
BoringSSL: TLS libraries, BoringSSL, Restrictions, HTTP/3 backends
brotli: HTTP Compression, Version, Which libcurl version runs, About content encodings, Conditional lines

C

-c: Writing cookies to file, Web logins and sessions
c-ares: c-ares, Line 4: Features, Name resolve tricks with c-ares, Name resolver backends, CURLRES_ARES, <features>
C89: Comments
CA: Available exit codes, MITM proxy, Verifying server certificates, OCSP stapling, Built-in certificate store, Caches, CA store caching, Verification, All options, Available information, CA store cache
CA cert cache: CA cert cache
--ca-native: Native CA stores, Considerations
Chrome: Copy as curl, SSLKEYLOGFILE
clone: Building libcurl on MSYS2, git, Website, build boringssl
code of conduct: Trust, Code of Conduct
--compressed: Gzipped transfers, Compression, The curl interface
--compressed-ssh: For SFTP/SCP
configure: root, Handling build options, Platform dependent code, Autotools, rpath, configure, set up the build tree to get detected by curl's configure, Ifdefs, Memory debugging, Debug builds
--connect-timeout: Connection timeout, Never spend more than this to connect
--connect-to: Provide a replacement name
connection cache: Connection reuse, Available --write-out variables, Connection cache, All options, Connection reuse, Multi handle, connection cache, connectdata
connection pool: Connection reuse, Connection cache, pool size, Connection reuse, connection cache
Connection reuse: Connection reuse, Connection cache, threads, Connection reuse
Content-Disposition: Use the target filename from the server
content-encoding: Transfer encoding, Compression, About content encodings
contribute: Code of Conduct, Contributing, Everything curl
Contributing: docs, Contributing
Cookie engine: Cookie engine, Writing cookies to file, Cookie engine
Cookies: docs, libpsl, Line 4: Features, Not perfect, Server differences, Change the Host: header, Session tracking, Authentication, Cookie engine, Reading cookies from file, Writing cookies to file, New cookie session, Cookie file format, Cookies, All options, Available information, Authentication, Cookies, Sharing between easy handles, Submit a login form over HTTP, Cookies, Curl_share, <features>
copyright: License, Copyright
curl-announce: curl-announce, Vulnerability handling
curl-library: curl-users, Make a patch for the mailing list, Vulnerability handling
curl-users: curl-users, Vulnerability handling
<curl/curl.h>: include/curl, Header files, --libcurl, Stop slow transfers, Rate limit, Progress meter, Include files, Get a simple HTTP page, Get a response into memory, Submit a login form over HTTP, Get an FTP directory listing, Non-blocking HTTP form-post, WebSocket with CONNECT_ONLY, WebSocket using callback
CURLE_ABORTED_BY_CALLBACK: Progress information
CURLHSTS_ENABLE: Enable HSTS for a handle
CURLHSTS_READONLYFILE: Enable HSTS for a handle
CURLINFO_CERTINFO: Available information
CURLINFO_CONN_ID: Transfer and connection identifiers, Available information
CURLINFO_CONTENT_TYPE: Post transfer info
CURLINFO_EFFECTIVE_URL: Available information
CURLINFO_FILETIME: Available information
CURLINFO_TOTAL_TIME_T: Available information
CURLINFO_XFER_ID: Transfer and connection identifiers, Available information
CURLMOPT_PIPELINING: Multiplexing
CURLMOPT_SOCKETFUNCTION: socket_callback
CURLMOPT_TIMERFUNCTION: timer_callback, Exposes a single timeout to apps
CURLOPT_ALTSVC: All options, Enable
CURLOPT_ALTSVC_CTRL: All options, Enable
CURLOPT_CA_CACHE_TIMEOUT: CA cert cache, All options
CURLOPT_CLOSESOCKETFUNCTION: All options, Socket close callback
CURLOPT_CONNECTTIMEOUT: All options, easy API
CURLOPT_COOKIE: All options, Setting custom cookies
CURLOPT_COOKIEFILE: All options, Enable cookie engine with reading, Submit a login form over HTTP
CURLOPT_COOKIEJAR: All options, Enable cookie engine with writing
CURLOPT_COOKIELIST: All options, Add a cookie to the cookie store
CURLOPT_CURLU: All options, CURLOPT_CURLU
CURLOPT_CUSTOMREQUEST: All options, Request method
CURLOPT_DEBUGDATA: Trace everything, All options, Debug
CURLOPT_DEBUGFUNCTION: Trace everything, All options, Debug
CURLOPT_DNS_CACHE_TIMEOUT: DNS cache, All options, Caching
CURLOPT_DNS_INTERFACE: All options, Name server options
CURLOPT_DNS_LOCAL_IP4: All options, Name server options
CURLOPT_DNS_LOCAL_IP6: All options, Name server options
CURLOPT_DNS_SERVERS: All options, Name server options
CURLOPT_DNS_USE_GLOBAL_CACHE: All options, No global DNS cache
CURLOPT_ERRORBUFFER: --libcurl, CURLcode return codes, All options
CURLOPT_FAILONERROR: All options, About HTTP response code "errors"
CURLOPT_HEADER: All options, Write data, Referrer, Download headers too
CURLOPT_HEADERDATA: --libcurl, All options, Header data, Download headers too
CURLOPT_HEADERFUNCTION: --libcurl, All options, Header data
CURLOPT_HSTS: All options, Set a HSTS cache file
CURLOPT_HSTS_CTRL: All options, Enable HSTS for a handle
CURLOPT_HTTPGET: All options, Download, Submit a login form over HTTP
CURLOPT_HTTPHEADER: All options, Add a header, HTTP PUT, Non-blocking HTTP form-post
CURLOPT_HTTPPOST: All options
CURLOPT_IPRESOLVE: All options, How libcurl connects, Name resolving
CURLOPT_LOCALPORT: All options, Local port number
CURLOPT_LOCALPORTRANGE: All options, Local port number
CURLOPT_LOW_SPEED_LIMIT: All options, easy API, Stop slow transfers
CURLOPT_LOW_SPEED_TIME: All options, easy API, Stop slow transfers
CURLOPT_MAXFILESIZE_LARGE: Set numerical options, All options
CURLOPT_MAXREDIRS: --libcurl, All options
CURLOPT_MIMEPOST: All options, HTTP multipart formposts, Non-blocking HTTP form-post
CURLOPT_NOBODY: All options, Request method
CURLOPT_NOPROGRESS: --libcurl, All options, Progress information, Progress meter
CURLOPT_OPENSOCKETDATA: All options, Provide a file descriptor
CURLOPT_OPENSOCKETFUNCTION: All options, Provide a file descriptor
CURLOPT_PIPEWAIT: All options, Multiplexing
CURLOPT_POST: All options, HTTP POST
CURLOPT_POSTFIELDS: Set string options, All options, Request method, HTTP POST, Submit a login form over HTTP
CURLOPT_POSTFIELDSIZE: CURLOPT_POSTFIELDS, All options, HTTP POST
CURLOPT_POSTREDIR: Decide what method to use in redirects, All options
CURLOPT_PROGRESSFUNCTION: All options, Progress information
CURLOPT_PROXY: All options, Proxy types
CURLOPT_PROXYPORT: All options, Proxy types
CURLOPT_PROXYTYPE: All options, Proxy types
CURLOPT_READDATA: --libcurl, All options, Read data
CURLOPT_READFUNCTION: --libcurl, All options, Read data, HTTP POST
CURLOPT_RESOLVE: All options, Custom addresses for hosts
CURLOPT_SEEKDATA: --libcurl, All options, Seek and ioctl
CURLOPT_SEEKFUNCTION: --libcurl, All options, Seek and ioctl
CURLOPT_SOCKOPTDATA: All options, sockopt
CURLOPT_SOCKOPTFUNCTION: All options, sockopt
CURLOPT_SSH_KNOWNHOSTS: --libcurl, All options, SSH key
CURLOPT_SSLVERSION: Protocol version, All options
CURLOPT_SSL_VERIFYHOST: Verification, All options
CURLOPT_SSL_VERIFYPEER: Verification, All options, HTTPS proxy
CURLOPT_STDERR: --libcurl, Verbose operations, All options
CURLOPT_TCP_KEEPALIVE: --libcurl, All options, Enable keep alive
CURLOPT_TCP_KEEPCNT: Probe count
CURLOPT_TCP_KEEPIDLE: All options, Idle time
CURLOPT_TCP_KEEPINTVL: All options, Probe interval
CURLOPT_TIMEOUT: Set numerical options, All options, easy API
CURLOPT_TLSAUTH_USERNAME: TLS auth, All options
CURLOPT_UPLOAD: All options, Request method, HTTP PUT
CURLOPT_URL: --libcurl, Strings are C strings, not C++ string objects, Easy handle, Set string options, All options, Example, Stop slow transfers, Rate limit, Progress meter, Request method, Bearer, Download, HTTP PUT, CURLOPT_CURLU, Get a simple HTTP page, Get a response into memory, Submit a login form over HTTP, Get an FTP directory listing, Non-blocking HTTP form-post, WebSocket with CONNECT_ONLY, WebSocket using callback
CURLOPT_USERAGENT: --libcurl, All options, Get a response into memory
CURLOPT_VERBOSE: Verbose operations, All options, Find a specific option by name, When connections are not reused as you want, Download headers too, Non-blocking HTTP form-post
CURLOPT_WRITEDATA: --libcurl, Callback considerations, All options, Write data, Get a response into memory, WebSocket using callback
CURLOPT_WRITEFUNCTION: --libcurl, Callback considerations, All options, Write data, Get a response into memory, WebSocket using callback
CURLOPT_XFERINFODATA: All options, Progress information
CURLOPT_XFERINFOFUNCTION: All options, Progress information
CURLUPART_FRAGMENT: Get URL parts, Set URL parts
CURLUPART_HOST: CURLU_PUNYCODE, Get URL parts, Set URL parts
CURLUPART_PASSWORD: Get URL parts, Set URL parts
CURLUPART_PATH: Get URL parts, Set URL parts
CURLUPART_PORT: Get URL parts, Set URL parts
CURLUPART_QUERY: Get URL parts, Set URL parts, Append to the query
CURLUPART_USER: Get URL parts, Set URL parts
curl_easy_cleanup: --libcurl, Stop slow transfers, Rate limit, Progress meter, easy handle, Bearer, Enable cookie engine with writing, Header struct, Get a simple HTTP page, Get a response into memory, Submit a login form over HTTP, Get an FTP directory listing, Non-blocking HTTP form-post, WebSocket with CONNECT_ONLY, WebSocket using callback
curl_easy_getinfo: docs/libcurl/opts, Transfer and connection identifiers, Post transfer info, Response meta-data, Get all cookies from the cookie store
curl_easy_init: --libcurl, Easy handle, Example, Stop slow transfers, Rate limit, Progress meter, Bearer, Download, CURLOPT_CURLU, Get a simple HTTP page, Get a response into memory, Submit a login form over HTTP, Get an FTP directory listing, Non-blocking HTTP form-post, WebSocket with CONNECT_ONLY, WebSocket using callback
curl_easy_option_by_id: Find a specific option by ID
curl_easy_option_by_next: Iterate over all options
curl_easy_perform: --libcurl, Drive with easy, Easy API pool, Example, Caching, easy API, Stop slow transfers, Rate limit, Progress meter, Add a header, Bearer, Download, Get a simple HTTP page, Get a response into memory, Submit a login form over HTTP, Get an FTP directory listing, WebSocket with CONNECT_ONLY, WebSocket using callback, Everything is multi
curl_easy_reset: Reuse
curl_easy_setopt: docs/libcurl/opts, --libcurl, CURLcode return codes, Verbose operations, Strings are C strings, not C++ string objects, Easy handle, Set numerical options, Set string options, TLS options, All options, Write data, Read data, Progress information, Header data, Debug, sockopt, Provide a file descriptor, Example, Name resolving, Stop slow transfers, Rate limit, Progress meter, Request method, Ranges, Username and password, Enable cookie engine with reading, Download, HTTP POST, Multiplexing, Enable HSTS for a handle, Enable, Sharing between easy handles, CURLOPT_CURLU, Get a simple HTTP page, Get a response into memory, Submit a login form over HTTP, Get an FTP directory listing, Non-blocking HTTP form-post, WebSocket with CONNECT_ONLY, WebSocket using callback, The libcurl interface
curl_global_cleanup: Global initialization, Get a response into memory, Get an FTP directory listing, WebSocket with CONNECT_ONLY, WebSocket using callback
curl_global_init: Global initialization, Get a response into memory, Get an FTP directory listing, WebSocket with CONNECT_ONLY, WebSocket using callback, Init calls
curl_global_trace: Trace more
CURL_IPRESOLVE_V6: Name resolving
CURL_MAX_WRITE_SIZE: Write data
curl_mime_addpart: HTTP multipart formposts, Non-blocking HTTP form-post
curl_mime_filedata: HTTP multipart formposts, Non-blocking HTTP form-post
curl_mime_init: HTTP multipart formposts, Non-blocking HTTP form-post
curl_mime_name: HTTP multipart formposts, Non-blocking HTTP form-post
curl_multi_add_handle: Drive with multi, Many easy handles, Non-blocking HTTP form-post, Curl_multi
curl_multi_cleanup: Multi API, Non-blocking HTTP form-post
curl_multi_fdset: Drive with multi, Curl_easy
curl_multi_info_read: When is a single transfer done?, When is it done?, Multi API, Curl_multi
curl_multi_init: Drive with multi, Non-blocking HTTP form-post
curl_multi_remove_handle: Drive with multi, Many easy handles, multi API, Multi API
curl_multi_setopt: docs/libcurl/opts, Drive with multi, socket_callback, Multiplexing
curl_multi_socket_action: curl_multi_socket_action, socket_callback
curl_multi_timeout: Drive with multi, Exposes a single timeout to apps
curl_multi_wait: Drive with multi
curl_off_t: Transfer and connection identifiers, Set numerical options, Progress information, Seek and ioctl, Rate limit, Available information, Response meta-data, HTTP PUT, Meta, curl_ws_send()
CURL_SOCKET_TIMEOUT: timer_callback
CURL_SSL_BACKEND: Line 1: TLS versions, Multiple TLS backends
curl_url: Include files, Create, cleanup, duplicate, Parse a URL, Redirect to URL, Update parts, CURLOPT_CURLU
curl_url_cleanup: Create, cleanup, duplicate
curl_url_dup: Create, cleanup, duplicate
curl_url_get: CURLU_ALLOW_SPACE, Get a URL, Get URL parts
curl_url_set: Include files, Parse a URL, Redirect to URL, Set URL parts, Append to the query, CURLOPT_CURLU
curl_version_info: Which libcurl version runs, Support
--curves: --curves

D

-d: Arguments to options, Separate options per URL, POST, MQTT, Method, Simple POST, Content-Type, Posting binary, Convert to GET, Expect 100-continue, Chunked encoded POSTs, Hidden form fields, -d vs -F, HTTP PUT, Web logins and sessions
--data: Arguments to options, Separate options per URL, POST, Simple POST, URL encode data
--data-binary: Not perfect, Simple POST, Posting binary, JSON, URL encode data
--data-urlencode: Query, URL encode data, Convert to GET
debian: Ubuntu and Debian, Version
Debug callback: Verbose operations, All options, Debug
development: Project communication, curl-users, Reporting bugs, Commercial support, Development, The development team, Future, Ubuntu and Debian, Get libcurl for macOS, Who decides what goes in?, From Safari, Figure out what a browser sends, Converting a web form, Which libcurl version runs, Verification, Debug builds
DICT: What protocols does curl support?, DICT, Without scheme, Version, DICT, CURLU_GUESS_SCHEME
--dump-ca-embed: Built-in certificate store

E

--ech: ECH
ECH: TLS, ECH
Edge: Copy as curl, Ifdefs
environment variables: Environment variables, Windows, Proxy environment variables, Proxy environment variables, <setenv>
ephemeral port: Local port number
ETag: Conditionals
--etag-compare: Check by modification of content
--etag-save: Check by modification of content
/etc/hosts: Run a local clone, Host, Edit the hosts file
etiquette: Mailing list etiquette
event-driven: Drive with multi_socket, Everything is multi

F

-F: Not perfect, multipart formpost, Method, Sending such a form with curl, -d vs -F
--fail: Available exit codes, HTTP response codes
--fail-with-body: HTTP response codes
Firefox: Copy as curl, Discover your proxy, SSLKEYLOGFILE, User-agent
Fragment: Query, Fragment, Available --write-out variables, Fragment, Write callback, Meta, curl_ws_send()
--ftp-method: multicwd
--ftp-pasv: Passive connections
--ftp-port: Available exit codes, Active connections
--ftp-skip-pasv-ip: Passive connections
FTPS: What protocols does curl support?, FTPS, TLS libraries, Supported schemes, Network leakage, Version, Trace options, Protocols allowing upload, Enable TLS, FTPS, Variables
future: Project communication, Future, What other protocols are there?, docs, curl-security@haxx.se, "Not used", More data, TLS session cache, API compatibility, Trace more, Network data conversion, HSTS, age, Set a timeout

G

--get: trurl example command lines, Convert to GET
git: Daily snapshots, Backdoors and supply chain risks, Building libcurl on MSYS2, root, git, Website, build boringssl, Continuous Integration, Autobuilds
Globbing: URL globbing, Reading URLs from a file, Globbing, Skip download if already done, Uploading with FTP
GnuTLS: lib/vtls, Select TLS backend, TLS libraries, Native CA stores, OCSP stapling, Restrictions, HTTP/3 backends, <features>
GOPHER: How it started, What protocols does curl support?, GOPHER, Supported schemes, Version, Variables
GOPHERS: What protocols does curl support?, GOPHERS, Supported schemes, Variables

H

Happy Eyeballs: Happy Eyeballs, All options, Happy Eyeballs
--happy-eyeballs-timeout-ms: Tweak
haproxy: haproxy, All options
--haproxy-clientip: curl and haproxy
--haproxy-protocol: curl and haproxy
--header: Server differences, Proxy headers, JSON, Customize headers
Header callback: All options, Header data, Response body, Download headers too
homebrew: macOS
Host:: HTTP basics, Trace options, Change the Host: header, The HTTP this generates, Customize headers, Customize HTTP request headers
--hostpubmd5: Public key verification
--hostpubsha256: Public key verification
--hsts: HSTS cache
HSTS: HTTPS, HSTS, All options, HSTS, HSTS, What to share, HSTS, <features>
HTTP proxy: How it started, Proxy type, HTTP proxy, Proxy headers, Authentication, All options, HTTP proxy, Available information, <proxy [nonewline="yes"]>
HTTP redirects: Short options, Long options, Available exit codes, Tell curl to follow redirects, Submit a login form over HTTP
HTTP Strict Transport Security: HSTS, HSTS, HSTS
HTTP/1.1: HTTP, HTTP basics, Trace options, HTTP/2, Debugging with TELNET, HTTP/2, Caveats, The HTTP this generates, GET or POST?, Request method, Request target, Customize HTTP request headers, Versions, About content encodings
HTTP/2: HTTP, docs, nghttp2, Line 4: Features, Available exit codes, More data, HTTP/2, HTTP/2, HTTP/3, HTTP/2 and later, GET or POST?, HTTP headers, HTTP/3, Trace more, When connections are not reused as you want, QUIC and HTTP/2, DNS over HTTPS, HTTPS proxy, Versions, Expect: headers, Multiplexing, HTTP/3, Curl_easy, Variables
HTTP/3: HTTP, Select HTTP/3 backend, QUIC and HTTP/3, TCP vs UDP, Line 4: Features, Available exit codes, More data, HTTP/3 racing, HTTP/3, HTTP headers, HTTP/3, Which libcurl version runs, Trace more, HTTP/3, When connections are not reused as you want, Versions, Expect: headers, Multiplexing, HTTP/3, Different backends
HTTP/3 backend: Select HTTP/3 backend, HTTP/3 backends
--http0.9: HTTP/0.9
--http2: HTTP/2
--http2-prior-knowledge: HTTP/2
--http3: HTTP/3 racing, Enable
--http3-only: When QUIC is denied
HttpGet: How it started
HTTPS proxy: Line 4: Features, HTTPS proxy, All options, Local or proxy name lookup

I

IDN: libidn2, International Domain Names (IDN), Version, CURLU_URLENCODE, Different backends, <features>
IETF: Protocols, TLS versions
Indentation: Indentation
International Domain Names: libidn2, International Domain Names (IDN), Line 4: Features
--ip-tos: Type of Service
IPFS: IPFS
--ipfs-gateway: Gateway
IPv4: Host, Port number, Available --write-out variables, Type of Service, Happy Eyeballs, curl and haproxy, All options, How libcurl connects, Name resolving, host*.c sources, Variables
IPv6: Host, Port number, URL globbing, Version, Available --write-out variables, Type of Service, Happy Eyeballs, SOCKS proxy, curl and haproxy, All options, How libcurl connects, Name resolving, Zone ID, CURLRES_IPV6, Variables
IRC: How it started, Project communication

J

JavaScript: Client differences, PAC, JavaScript and forms, JavaScript redirects, Figure out what the browser does
--json: trurl example command lines, JSON
json: Arguments with spaces, Expand functions, Available --write-out variables, Content-Type, JSON, POST outside of HTML

K

-K: Command lines, quotes and aliases, Specify the config file to use
keep-alive: All options, Example
--keepalive-cnt: Keep alive
--keepalive-time: Keep alive

L

-L: Short options, Available --write-out variables, Location: too, Tell curl to follow redirects, Request method, Cookie engine, Reading cookies from file, Redirects
LD_LIBRARY_PATH: LD_LIBRARY_PATH
--libcurl: --libcurl
libcurl version: Line 1: curl, Available exit codes, Which libcurl version, Network data conversion
libidn2: libidn2
libpsl: libpsl
LibreSSL: TLS libraries, Restrictions, HTTP/3 backends
libssh: SSH libraries, <features>
libssh2: SSH libraries, <features>
license: Finding users, License, root, License
--limit-rate: Rate limiting
--location: Long options, Separate options per URL, Syntax, Tell curl to follow redirects
Location: docs, Command line options, Options

M

--max-filesize: Maximum filesize
--max-time: Tweak your retries, Maximum time allowed to spend
mbedTLS: lib/vtls, TLS libraries, All options, SSL context
MIT: License
--mptcp: Multipath TCP
MQTT: What protocols does curl support?, MQTT, Supported schemes, Line 3: Protocols, MQTT, Variables, Test servers
mTLS: Client certificates
multi-threading: multi-threading
Multipath TCP: Multipath TCP

N

name resolving: Hostname resolving, Handling build options, Available --write-out variables, Name resolve tricks with c-ares, SOCKS proxy, Connection reuse, Name resolving, Proxy types, Available information, Different backends
--negotiate: Network leakage, Authentication
.netrc: Command line leakage, .netrc, All options, .netrc, <features>
--netrc-file: Enable netrc
--netrc-optional: Enable netrc
nghttp2: nghttp2, Which libcurl version runs
nix: nix
--no-clobber: Overwriting
--no-eprt: Active connections
--no-epsv: Passive connections
--no-keepalive: Keep alive
NPN: All options
--ntlm: Network leakage, Authentication

O

-O: Many options and URLs, Numerical ranges, Download to a file named by the URL, Use the target filename from the server, Shell redirects, Multiple downloads, Resuming and ranges, Request rate limiting, For SFTP/SCP, Skip download if already done, Authentication, Download, Check by modification date
openldap: openldap
OpenSSL: Get curl and libcurl on MSYS2, lib/vtls, Select TLS backend, TLS libraries, Available exit codes, Native CA stores, OCSP stapling, Restrictions, All options, SSL context, Available information, HTTP/3 backends, <features>
--out-null: Discard received data
--output-dir: Store in another directory, Use the target filename from the server

P

PAC: PAC, Which proxy?
--parallel: Reading URLs from a file, Parallel transfers, Parallel progress meter, Parallel, Request rate limiting
--parallel-immediate: Connection before multiplex
--parallel-max: Parallel transfers
--parallel-max-host: Reduce load on individual hosts
--path-as-is: --path-as-is
Percent-encoding: URL encode data
pop3: What protocols does curl support?, POP3, Without scheme, Version, Available exit codes, Enable TLS, IMAP, POP3, Secure mail transfer, STARTTLS, CURLU_GUESS_SCHEME, Variables, Test servers
port number: Connect to port numbers, The URL converted to a request, Port number, Reduce load on individual hosts, trurl example command lines, Available exit codes, Available --write-out variables, Provide a custom IP address for a name, Local port number, HTTP proxy, Historic TELNET, Enable, Converting a web form, Implicit FTPS, All options, Prereq, Local address and port number, Connection reuse, Custom addresses for hosts, Proxies, Post transfer info, CURLU_DEFAULT_PORT, Set URL parts, Alt-Svc, Base64 Encoding
Post-quantum: TLS, Post-quantum
--post301: Decide what method to use in redirects
--post302: Decide what method to use in redirects
--post303: Decide what method to use in redirects
PQC: Post-quantum
Progress callback: All options, timer_callback, Progress information, easy API, Progress callback
pronunciation: Pronunciation
--proxy: HTTP proxy, Authentication
proxy: How it started, Line 4: Features, Available exit codes, Available --write-out variables, Intermediaries' fiddlings, Discover your proxy, PAC, Proxy type, HTTP proxy, SOCKS proxy, MITM proxy, Proxy authentication, HTTPS proxy, Proxy environment variables, Proxy headers, haproxy, CONNECT response codes, Authentication, Verification, All options, Proxies, Available information, Variables
--proxy-ca-native: Native CA stores
--proxy-http2: HTTP/2
--proxy-user: Proxy authentication, Authentication
--proxy1.0: HTTP proxy tunneling
--proxytunnel: HTTP proxy tunneling

Q

-Q: Quote
QUIC: Establish a connection, HTTPS, QUIC and HTTP/3, Available exit codes, Multipath TCP, HTTP/3 racing, Never spend more than this to connect, QUIC, Which libcurl version runs, HTTP/3, Enable keep alive, Authentication, Version 3 can be mandatory, HTTP/3 backends
--quote: Quote

R

ranges: Numerical ranges, Resuming and ranges, Skip download if already done, A range trick, Ranges, Provide a file descriptor, HTTP response code, Ranges
--rate: Request rate limiting
Read callback: make callbacks as fast as possible, All options, Read data, HTTP POST
redhat: Redhat and CentOS
redirects: Long options, Separate options per URL, Syntax, Available exit codes, Available --write-out variables, Download to a file named by the URL, Location: too, Shell redirects, Provide a custom IP address for a name, Captive portals, Redirects, Request method, Redirects, All options, Custom addresses for hosts, Available information, Automatic referrer, Submit a login form over HTTP
RELEASE-NOTES: scripts
releases: curl-announce, Releases, Backdoors and supply chain risks, scripts, Which libcurl version
--remote-name-all: One output for each given URL, Use the URL's filename part for all URLs
--remove-on-error: Leftovers on errors
repository: Releases, Backdoors and supply chain risks, Source code on GitHub, The development team, Arch Linux, Building libcurl on MSYS2, root, What to add, Website, Continuous Integration, Autobuilds, Content
--resolve: Provide a custom IP address for a name
--retry: Available --write-out variables, Retry, Request rate limiting
--retry-all-errors: Retry on any and all errors
--retry-connrefused: Connection refused
--retry-delay: Tweak your retries
--retry-max-time: Tweak your retries
RFC 1436: GOPHER
RFC 1738: FILE, multicwd
RFC 1939: POP3
RFC 1945: Redirects
RFC 2229: DICT
RFC 2246: TLS versions
RFC 2326: RTSP
RFC 2595: IMAP
RFC 2616: About content encodings
RFC 2818: HTTPS
RFC 3207: SMTP
RFC 3501: IMAP
RFC 3986: Browsers
RFC 4217: FTPS
RFC 4511: LDAP
RFC 5321: SMTP
RFC 7838: Alternative Services
RFC 8314: IMAPS
RFC 8446: TLS versions
RFC 854: TELNET
RFC 8999: HTTPS
RFC 9110: HTTP
RFC 9112: HTTP
RFC 9113: HTTP
RFC 9114: HTTP
RFC 959: FTP, Quote
roadmap: Future
rpath: rpath
RTSP: What protocols does curl support?, RTSP, Supported schemes, Version, All options, RTSP interleaved data, Available information, Variables
rustls: TLS libraries, <features>
rustls-ffi: Select TLS backend, Rustls

S

Safari: Copy as curl
Schannel: TLS libraries, Native CA stores, HTTP/3 backends, <features>
Scheme: Connect to port numbers, FILE, Naming, Scheme, Name and password, TCP vs UDP, Browsers, Available exit codes, Available --write-out variables, Proxy type, SOCKS proxy, Proxy authentication, TLS for IMAP, TLS for POP3, Which libcurl version, Proxy types, Available information, Authentication, CURLU_NON_SUPPORT_SCHEME, CURLU_DEFAULT_PORT, URLs, Get a response into memory, Protocol handler, Curl_handler
SCP: What protocols does curl support?, SCP, SSH libraries, Supported schemes, Version, Available exit codes, Protocols allowing upload, Compression, URLs, Authentication, Known hosts, Protocol, All options, Authentication, Curl_handler, <server>
security: trurl, a URL tool, curl-announce, Commercial support, Security, Trust, Security, How much do protocols change?, FTPS, docs, Reporting vulnerabilities, http_proxy in lower case only, TLS, Ciphers, Enable TLS, TLS versions, Requirements and Dependencies, How to use early data, Public key verification, HTTP/0.9, HSTS, Protocol version, All options, HSTS, Authentication, What to share, URLs, HSTS
SFTP: What protocols does curl support?, SFTP, SSH libraries, Supported schemes, Version, Available exit codes, Trace options, Protocols allowing upload, Compression, URLs, Authentication, Known hosts, Protocol, All options, Authentication, Curl_handler, <server>, Run a range of tests
--silent: Progress meter, Error message
--skip-existing: Reading URLs from a file, Skip download if already done
SMTP: What protocols does curl support?, SMTP, Without scheme, Version, Available exit codes, Protocols allowing upload, Enable TLS, SMTP, STARTTLS, All options, CURLU_GUESS_SCHEME, Variables, Test servers
SMTPS: What protocols does curl support?, SMTPS, TLS libraries, Supported schemes, Version, Protocols allowing upload, Enable TLS
snapshots: Daily snapshots, root
SNI: Change the Host: header, ECH
--socks4: SOCKS proxy
--socks4a: SOCKS proxy
--socks5: SOCKS proxy
--socks5-hostname: SOCKS proxy
--speed-limit: Stop slow transfers
--speed-time: Stop slow transfers
SSH: SCP, Select SSH backend, SSH libraries, Available exit codes, Authentication, Known hosts, Why Use It?, Historic TELNET, Trace everything, All options, SSH key, Authentication, Different backends, Curl_handler, Variables
SSH backend: Select SSH backend
SSL context callback: All options
--ssl-sessions: TLS session cache
SSLKEYLOGFILE: TLS, SSLKEYLOGFILE, Figure out what a browser sends
STARTTLS: IMAP, TLS for IMAP, TLS for POP3, STARTTLS

T

-T: PUT, Upload, Method, HTTP PUT, Uploading with FTP
TCP: Establish a connection, How much do protocols change?, DICT, TCP vs UDP, Available exit codes, Available --write-out variables, Multipath TCP, Connection timeout, HTTP/3 racing, Local port number, Keep alive, Timeouts, HTTP proxy tunneling, MITM proxy, haproxy, TLS, Debugging with TELNET, TFTP, QUIC, HTTPS, Two connections, Connection cache, All options, HTTP/3, Keep alive, connectdata
TELNET: What protocols does curl support?, TELNET, Supported schemes, Version, Available exit codes, TELNET, All options, Variables
testing: What does curl do?, Reporting bugs, Release candidates, Handling build options, Contributing, Run a local clone, Separate install, About HTTP response code "errors", Debug builds, Test servers, Torture
TFTP: What protocols does curl support?, TFTP, Supported schemes, TCP vs UDP, Version, Available exit codes, Protocols allowing upload, TFTP, All options, Variables, Test servers
--tftp-blksize: TFTP options
--tftp-no-options: TFTP options
--time-cond: Check by modification date
TLS: Security, How much do protocols change?, GOPHERS, The URL converted to a request, Ubuntu and Debian, lib/vtls, Handling build options, Select TLS backend, TLS libraries, TLS libraries, Line 1: curl, Available exit codes, More data, Available --write-out variables, Change the Host: header, Never spend more than this to connect, MITM proxy, TLS, Ciphers, Enable TLS, TLS versions, Verifying server certificates, Certificate pinning, OCSP stapling, Client certificates, TLS auth, TLS backends, SSLKEYLOGFILE, ECH, Built-in certificate store, TLS sessions and early data, Post-quantum, Known hosts, TLS for IMAP, Caveats, TLS for POP3, HTTPS only, Figure out what a browser sends, HTTPS, TLS fingerprinting, FTPS, Trace everything, Caches, reuse handles, TLS options, All options, SSL context, HTTP proxy, Authentication, Available information, URLs, Different backends, connection cache, Variables
TLS backend: Ubuntu and Debian, lib/vtls, Select TLS backend, Line 1: curl, Available exit codes, TLS, Native CA stores, Certificate pinning, OCSP stapling, Client certificates, TLS backends, CA cert cache, CA store caching, SSL context
--tls-earlydata: Available --write-out variables, TLS session cache
TODO: Future, Suggestions
--tr-encoding: Transfer encoding, Compression
--trace: Trace options, <command [option="no-output/no-include/force-output/binary-trace"] [timeout="secs"][delay="secs"][type="perl/shell"]>
--trace-ascii: Trace options, Server differences, <command [option="no-output/no-include/force-output/binary-trace"] [timeout="secs"][delay="secs"][type="perl/shell"]>
--trace-config: More data
--trace-ids: Identify transfers and connections
--trace-time: Time stamps
Traffic Class: Type of Service
transfer-encoding: Pass on transfer encoding, Chunked encoded POSTs
trurl: What does curl do?, trurl
Type of Service: Type of Service

U

-U: Building libcurl on MSYS2, Help with a specific option, Proxy authentication
-u: Building libcurl on MSYS2, Passwords, URLs, Authentication, Basics, Authentication
Ubuntu: Ubuntu and Debian
URL Globbing: URL globbing
URL parser: trurl, a URL tool, Browsers, trurl, CURLU_ALLOW_SPACE
--url-query: Query

V

--variable: Setting variables, Expand variables, Environment variables, Expand --variable, b64
variables: No assignments in conditions, Output variables for globbing, Config file, Assign variables, Expand variables, Environment variables, Expand --variable, Expand functions, Error message, Write out, Available --write-out variables, Proxy environment variables, Ciphers, Proxy environment variables, Preprocessed
--verbose: Long options, Time stamps
--version: Version, TLS backends, Memory debugging
--vlan-priority: VLAN
Vulnerability: Backdoors and supply chain risks, Vulnerability handling

W

wcurl: What does curl do?
Wireshark: Available exit codes, Trace options, SSLKEYLOGFILE, Figure out what a browser sends
wolfSSL: Commercial support, lib/vtls, TLS libraries, Native CA stores, Restrictions, All options, SSL context, HTTP/3 backends, <features>
Write callback: make callbacks as fast as possible, Callback considerations, All options, Write data, Response body, 1. The callback approach, Raw mode, Write callback, Get a simple HTTP page, Get a response into memory, WebSocket using callback
--write-out: Error message, Write out, Available --write-out variables, Time specifiers, Overwriting, HTTP response codes

X

Y

yum: Redhat and CentOS

Z

-Z: Parallel transfers, Parallel
-z: Check by modification date
zlib: HTTP Compression, About content encodings
zstd: HTTP Compression, Which libcurl version runs, Supported content encodings