(FTP/SFTP) When used in an upload, this makes curl append to the target file instead of overwriting it.

This option tells curl to resolve names to IPv6 addresses only, and not for example try IPv4. This option tells curl to resolve names to IPv4 addresses only, and not for example try IPv6. Sometimes curl is built without SSLv3 support. (SSL) Forces curl to use SSL version 3 when negotiating with a remote SSL server. Sometimes curl is built without SSLv2 support. (SSL) Forces curl to use SSL version 2 when negotiating with a remote SSL server. Version more precisely (if the SSL backend in use supports such a level of control). You can use options -tlsv1.0, -tlsv1.1, and -tlsv1.2 to control the TLS (SSL) Forces curl to use TLS version 1.x when negotiating with a remote TLS server. HTTP 2 to negotiate HTTP 2 support with the server during https sessions. ALPN is enabled by default if libcurl was built with an SSL library that supports ALPN. To negotiate HTTP 2 support with the server during https sessions.ĭisable the ALPN TLS extension. NPN is used by a libcurl that supports HTTP 2 NPN is enabled by default if libcurl was built with an SSL library that supports NPN. (Added in 7.33.0)ĭisable the NPN TLS extension. This requires that the underlying libcurl was built to support it. (HTTP) Tells curl to issue its requests using HTTP 2.

(HTTP) Tells curl to use HTTP version 1.1. (HTTP) Tells curl to use HTTP version 1.0 instead of using its internally preferred: HTTP 1.1. Options, for example, such as different user names or custom requests for each. This allows you to send several URL requests, each with their own specific Tells curl to use a separate operation for the following URL and associated options. Make curl display progress as a simple progress bar instead of the standard, more informational, meter.

Curl command mac