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+.SH FILES
+.I ~/.curlrc
+.RS
+Default config file, see \fI-K, --config\fP for details.
+.SH ENVIRONMENT
+The environment variables can be specified in lower case or upper case. The
+lower case version has precedence. http_proxy is an exception as it is only
+available in lower case.
+
+Using an environment variable to set the proxy has the same effect as using
+the \fI--proxy\fP option.
+
+.IP "http_proxy [protocol://]<host>[:port]"
+Sets the proxy server to use for HTTP.
+.IP "HTTPS_PROXY [protocol://]<host>[:port]"
+Sets the proxy server to use for HTTPS.
+.IP "[url-protocol]_PROXY [protocol://]<host>[:port]"
+Sets the proxy server to use for [url-protocol], where the protocol is a
+protocol that curl supports and as specified in a URL. FTP, FTPS, POP3, IMAP,
+SMTP, LDAP etc.
+.IP "ALL_PROXY [protocol://]<host>[:port]"
+Sets the proxy server to use if no protocol-specific proxy is set.
+.IP "NO_PROXY <comma-separated list of hosts>"
+list of host names that shouldn't go through any proxy. If set to a asterisk
+\&'*' only, it matches all hosts.
+.SH "PROXY PROTOCOL PREFIXES"
+Since curl version 7.21.7, the proxy string may be specified with a
+protocol:// prefix to specify alternative proxy protocols.
+
+If no protocol is specified in the proxy string or if the string doesn't match
+a supported one, the proxy will be treated as an HTTP proxy.
+
+The supported proxy protocol prefixes are as follows:
+.IP "socks4://"
+Makes it the equivalent of \fI--socks4\fP
+.IP "socks4a://"
+Makes it the equivalent of \fI--socks4a\fP
+.IP "socks5://"
+Makes it the equivalent of \fI--socks5\fP
+.IP "socks5h://"
+Makes it the equivalent of \fI--socks5-hostname\fP
+.SH EXIT CODES
+There are a bunch of different error codes and their corresponding error
+messages that may appear during bad conditions. At the time of this writing,
+the exit codes are:
+.IP 1
+Unsupported protocol. This build of curl has no support for this protocol.
+.IP 2
+Failed to initialize.
+.IP 3
+URL malformed. The syntax was not correct.
+.IP 4
+A feature or option that was needed to perform the desired request was not
+enabled or was explicitly disabled at build-time. To make curl able to do
+this, you probably need another build of libcurl!
+.IP 5
+Couldn't resolve proxy. The given proxy host could not be resolved.
+.IP 6
+Couldn't resolve host. The given remote host was not resolved.
+.IP 7
+Failed to connect to host.
+.IP 8
+Weird server reply. The server sent data curl couldn't parse.
+.IP 9
+FTP access denied. The server denied login or denied access to the particular
+resource or directory you wanted to reach. Most often you tried to change to a
+directory that doesn't exist on the server.
+.IP 11
+FTP weird PASS reply. Curl couldn't parse the reply sent to the PASS request.
+.IP 13
+FTP weird PASV reply, Curl couldn't parse the reply sent to the PASV request.
+.IP 14
+FTP weird 227 format. Curl couldn't parse the 227-line the server sent.
+.IP 15
+FTP can't get host. Couldn't resolve the host IP we got in the 227-line.
+.IP 17
+FTP couldn't set binary. Couldn't change transfer method to binary.
+.IP 18
+Partial file. Only a part of the file was transferred.
+.IP 19
+FTP couldn't download/access the given file, the RETR (or similar) command
+failed.
+.IP 21
+FTP quote error. A quote command returned error from the server.
+.IP 22
+HTTP page not retrieved. The requested url was not found or returned another
+error with the HTTP error code being 400 or above. This return code only
+appears if \fI-f, --fail\fP is used.
+.IP 23
+Write error. Curl couldn't write data to a local filesystem or similar.
+.IP 25
+FTP couldn't STOR file. The server denied the STOR operation, used for FTP
+uploading.
+.IP 26
+Read error. Various reading problems.
+.IP 27
+Out of memory. A memory allocation request failed.
+.IP 28
+Operation timeout. The specified time-out period was reached according to the
+conditions.
+.IP 30
+FTP PORT failed. The PORT command failed. Not all FTP servers support the PORT
+command, try doing a transfer using PASV instead!
+.IP 31
+FTP couldn't use REST. The REST command failed. This command is used for
+resumed FTP transfers.
+.IP 33
+HTTP range error. The range "command" didn't work.
+.IP 34
+HTTP post error. Internal post-request generation error.
+.IP 35
+SSL connect error. The SSL handshaking failed.
+.IP 36
+FTP bad download resume. Couldn't continue an earlier aborted download.
+.IP 37
+FILE couldn't read file. Failed to open the file. Permissions?
+.IP 38
+LDAP cannot bind. LDAP bind operation failed.
+.IP 39
+LDAP search failed.
+.IP 41
+Function not found. A required LDAP function was not found.
+.IP 42
+Aborted by callback. An application told curl to abort the operation.
+.IP 43
+Internal error. A function was called with a bad parameter.
+.IP 45
+Interface error. A specified outgoing interface could not be used.
+.IP 47
+Too many redirects. When following redirects, curl hit the maximum amount.
+.IP 48
+Unknown option specified to libcurl. This indicates that you passed a weird
+option to curl that was passed on to libcurl and rejected. Read up in the
+manual!
+.IP 49
+Malformed telnet option.
+.IP 51
+The peer's SSL certificate or SSH MD5 fingerprint was not OK.
+.IP 52
+The server didn't reply anything, which here is considered an error.
+.IP 53
+SSL crypto engine not found.
+.IP 54
+Cannot set SSL crypto engine as default.
+.IP 55
+Failed sending network data.
+.IP 56
+Failure in receiving network data.
+.IP 58
+Problem with the local certificate.
+.IP 59
+Couldn't use specified SSL cipher.
+.IP 60
+Peer certificate cannot be authenticated with known CA certificates.
+.IP 61
+Unrecognized transfer encoding.
+.IP 62
+Invalid LDAP URL.
+.IP 63
+Maximum file size exceeded.
+.IP 64
+Requested FTP SSL level failed.
+.IP 65
+Sending the data requires a rewind that failed.
+.IP 66
+Failed to initialise SSL Engine.
+.IP 67
+The user name, password, or similar was not accepted and curl failed to log in.
+.IP 68
+File not found on TFTP server.
+.IP 69
+Permission problem on TFTP server.
+.IP 70
+Out of disk space on TFTP server.
+.IP 71
+Illegal TFTP operation.
+.IP 72
+Unknown TFTP transfer ID.
+.IP 73
+File already exists (TFTP).
+.IP 74
+No such user (TFTP).
+.IP 75
+Character conversion failed.
+.IP 76
+Character conversion functions required.
+.IP 77
+Problem with reading the SSL CA cert (path? access rights?).
+.IP 78
+The resource referenced in the URL does not exist.
+.IP 79
+An unspecified error occurred during the SSH session.
+.IP 80
+Failed to shut down the SSL connection.
+.IP 82
+Could not load CRL file, missing or wrong format (added in 7.19.0).
+.IP 83
+Issuer check failed (added in 7.19.0).
+.IP 84
+The FTP PRET command failed
+.IP 85
+RTSP: mismatch of CSeq numbers
+.IP 86
+RTSP: mismatch of Session Identifiers
+.IP 87
+unable to parse FTP file list
+.IP 88
+FTP chunk callback reported error
+.IP 89
+No connection available, the session will be queued
+.IP 90
+SSL public key does not matched pinned public key
+.IP XX
+More error codes will appear here in future releases. The existing ones
+are meant to never change.
+.SH AUTHORS / CONTRIBUTORS
+Daniel Stenberg is the main author, but the whole list of contributors is
+found in the separate THANKS file.
+.SH WWW
+https://curl.haxx.se
+.SH FTP
+ftp://ftp.sunet.se/pub/www/utilities/curl/
+.SH "SEE ALSO"
+.BR ftp (1),
+.BR wget (1)