.SH AVAILABILITY
This option was called CURLOPT_ENCODING before 7.21.6
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_TRANSFER_ENCODING "(3), " CURLOPT_HTTPHEADER "(3), "
.SH AVAILABILITY
Added in 7.19.0
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_SSL_VERIFYPEER "(3), " CURLOPT_SSL_VERIFYHOST "(3), "
resolver backend that supports this operation. The c-ares backend is the only
such one.
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not,
+or CURLE_NOT_BUILT_IN if support was disabled at compile-time.
.SH "SEE ALSO"
.BR CURLOPT_DNS_SERVERS "(3), " CURLOPT_DNS_LOCAL_IP4 "(3), "
Added in 7.33.0
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not,
+CURLE_NOT_BUILT_IN if support was disabled at compile-time, or
+CURLE_BAD_FUNCTION_ARGUMENT when given a bad address.
.SH "SEE ALSO"
.BR CURLOPT_DNS_INTERFACE "(3), " CURLOPT_DNS_LOCAL_IP4 "(3), "
Added in 7.33.0
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not,
+CURLE_NOT_BUILT_IN if support was disabled at compile-time, or
+CURLE_BAD_FUNCTION_ARGUMENT when given a bad address.
.SH "SEE ALSO"
.BR CURLOPT_DNS_INTERFACE "(3), " CURLOPT_DNS_LOCAL_IP4 "(3), "
Added in 7.24.0
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not,
+CURLE_NOT_BUILT_IN if support was disabled at compile-time,
+CURLE_BAD_FUNCTION_ARGUMENT when given an invalid server list, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_DNS_LOCAL_IP4 "(3), " CURLOPT_DNS_CACHE_TIMEOUT "(3), "
.SH AVAILABILITY
Added in 7.15.5
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_FTP_SKIP_PASV_IP "(3), " CURLOPT_FTP_RESPONSE_TIMEOUT "(3), "
Added in 7.10.7. SFTP support added in 7.16.3. The retry option was added in
7.19.4.
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if the
+create value is not.
.SH "SEE ALSO"
.BR CURLOPT_FTP_FILEMETHOD "(3), " CURLOPT_FTP_USE_EPSV "(3), "
CURLAUTH_NTLM_WB was added in 7.22.0
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_NOT_BUILT_IN if the bitmask specified no supported authentication
+methods.
.SH "SEE ALSO"
.BR CURLOPT_PROXYAUTH "(3), " CURLOPT_USERPWD "(3), "
.SH AVAILABILITY
Added in 7.34.0
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_USERNAME "(3), " CURLOPT_PASSWORD "(3), "
.SH AVAILABILITY
Added in 7.25.0
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_MAIL_FROM "(3), " CURLOPT_MAIL_RCPT "(3), "
.SH AVAILABILITY
Added in 7.20.0
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_MAIL_RCPT "(3), " CURLOPT_MAIL_AUTH "(3), "
.SH AVAILABILITY
Added in 7.10.7
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_NOT_BUILT_IN if the bitmask specified no supported authentication
+methods.
.SH "SEE ALSO"
.BR CURLOPT_PROXY "(3), " CURLOPT_PROXYTYPE "(3), "
.BR CURLOPT_PROXYUSERPWD "(3), " CURLOPT_PROXYPORT "(3), "
.SH AVAILABILITY
Added in 7.18.0
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if the
+enabled value is not supported.
.SH "SEE ALSO"
.BR CURLOPT_PROXY "(3), " CURLOPT_HTTPPROXYTUNNEL "(3), "
.SH AVAILABILITY
Added in 7.19.4
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_PROXY "(3), " CURLOPT_PROXYTYPE "(3), "
.SH AVAILABILITY
Added in 7.16.1
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_SSH_PUBLIC_KEYFILE "(3), " CURLOPT_SSH_AUTH_TYPES "(3), "
.SH AVAILABILITY
The "" trick was added in 7.26.0
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_SSH_PRIVATE_KEYFILE "(3), " CURLOPT_SSH_AUTH_TYPES "(3), "
.SH AVAILABILITY
Added in 7.21.4
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_TLSAUTH_TYPE "(3), " CURLOPT_TLSAUTH_USERNAME "(3), "
.SH AVAILABILITY
Added in 7.21.4
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_TLSAUTH_TYPE "(3), " CURLOPT_TLSAUTH_PASSWORD "(3), "
.SH AVAILABILITY
Added in 7.33.0
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_MAIL_AUTH "(3), " CURLOPT_USERNAME "(3), "