1 .SH FILES 2 .I ~/.curlrc 3 .RS 4 Default config file, see --config for details. 5 .SH ENVIRONMENT 6 The environment variables can be specified in lower case or upper case. The 7 lower case version has precedence. http_proxy is an exception as it is only 8 available in lower case. 9 10 Using an environment variable to set the proxy has the same effect as using 11 the --proxy option. 12 13 .IP "http_proxy [protocol://]<host>[:port]" 14 Sets the proxy server to use for HTTP. 15 .IP "HTTPS_PROXY [protocol://]<host>[:port]" 16 Sets the proxy server to use for HTTPS. 17 .IP "[url-protocol]_PROXY [protocol://]<host>[:port]" 18 Sets the proxy server to use for [url-protocol], where the protocol is a 19 protocol that curl supports and as specified in a URL. FTP, FTPS, POP3, IMAP, 20 SMTP, LDAP etc. 21 .IP "ALL_PROXY [protocol://]<host>[:port]" 22 Sets the proxy server to use if no protocol-specific proxy is set. 23 .IP "NO_PROXY <comma-separated list of hosts/domains>" 24 list of host names that shouldn't go through any proxy. If set to an asterisk 25 \&'*' only, it matches all hosts. Each name in this list is matched as either 26 a domain name which contains the hostname, or the hostname itself. 27 28 This environment variable disables use of the proxy even when specified with 29 the --proxy option. That is 30 .B NO_PROXY=direct.example.com curl -x http://proxy.example.com 31 .B http://direct.example.com 32 accesses the target URL directly, and 33 .B NO_PROXY=direct.example.com curl -x http://proxy.example.com 34 .B http://somewhere.example.com 35 accesses the target URL through the proxy. 36 37 The list of host names can also be include numerical IP addresses, and IPv6 38 versions should then be given without enclosing brackets. 39 40 .SH "PROXY PROTOCOL PREFIXES" 41 Since curl version 7.21.7, the proxy string may be specified with a 42 protocol:// prefix to specify alternative proxy protocols. 43 44 If no protocol is specified in the proxy string or if the string doesn't match 45 a supported one, the proxy will be treated as an HTTP proxy. 46 47 The supported proxy protocol prefixes are as follows: 48 .IP "http://" 49 Makes it use it as an HTTP proxy. The default if no scheme prefix is used. 50 .IP "https://" 51 Makes it treated as an \fBHTTPS\fP proxy. 52 .IP "socks4://" 53 Makes it the equivalent of --socks4 54 .IP "socks4a://" 55 Makes it the equivalent of --socks4a 56 .IP "socks5://" 57 Makes it the equivalent of --socks5 58 .IP "socks5h://" 59 Makes it the equivalent of --socks5-hostname 60 .SH EXIT CODES 61 There are a bunch of different error codes and their corresponding error 62 messages that may appear during bad conditions. At the time of this writing, 63 the exit codes are: 64 .IP 1 65 Unsupported protocol. This build of curl has no support for this protocol. 66 .IP 2 67 Failed to initialize. 68 .IP 3 69 URL malformed. The syntax was not correct. 70 .IP 4 71 A feature or option that was needed to perform the desired request was not 72 enabled or was explicitly disabled at build-time. To make curl able to do 73 this, you probably need another build of libcurl! 74 .IP 5 75 Couldn't resolve proxy. The given proxy host could not be resolved. 76 .IP 6 77 Couldn't resolve host. The given remote host was not resolved. 78 .IP 7 79 Failed to connect to host. 80 .IP 8 81 Weird server reply. The server sent data curl couldn't parse. 82 .IP 9 83 FTP access denied. The server denied login or denied access to the particular 84 resource or directory you wanted to reach. Most often you tried to change to a 85 directory that doesn't exist on the server. 86 .IP 10 87 FTP accept failed. While waiting for the server to connect back when an active 88 FTP session is used, an error code was sent over the control connection or 89 similar. 90 .IP 11 91 FTP weird PASS reply. Curl couldn't parse the reply sent to the PASS request. 92 .IP 12 93 During an active FTP session while waiting for the server to connect back to 94 curl, the timeout expired. 95 .IP 13 96 FTP weird PASV reply, Curl couldn't parse the reply sent to the PASV request. 97 .IP 14 98 FTP weird 227 format. Curl couldn't parse the 227-line the server sent. 99 .IP 15 100 FTP can't get host. Couldn't resolve the host IP we got in the 227-line. 101 .IP 16 102 HTTP/2 error. A problem was detected in the HTTP2 framing layer. This is 103 somewhat generic and can be one out of several problems, see the error message 104 for details. 105 .IP 17 106 FTP couldn't set binary. Couldn't change transfer method to binary. 107 .IP 18 108 Partial file. Only a part of the file was transferred. 109 .IP 19 110 FTP couldn't download/access the given file, the RETR (or similar) command 111 failed. 112 .IP 21 113 FTP quote error. A quote command returned error from the server. 114 .IP 22 115 HTTP page not retrieved. The requested url was not found or returned another 116 error with the HTTP error code being 400 or above. This return code only 117 appears if --fail is used. 118 .IP 23 119 Write error. Curl couldn't write data to a local filesystem or similar. 120 .IP 25 121 FTP couldn't STOR file. The server denied the STOR operation, used for FTP 122 uploading. 123 .IP 26 124 Read error. Various reading problems. 125 .IP 27 126 Out of memory. A memory allocation request failed. 127 .IP 28 128 Operation timeout. The specified time-out period was reached according to the 129 conditions. 130 .IP 30 131 FTP PORT failed. The PORT command failed. Not all FTP servers support the PORT 132 command, try doing a transfer using PASV instead! 133 .IP 31 134 FTP couldn't use REST. The REST command failed. This command is used for 135 resumed FTP transfers. 136 .IP 33 137 HTTP range error. The range "command" didn't work. 138 .IP 34 139 HTTP post error. Internal post-request generation error. 140 .IP 35 141 SSL connect error. The SSL handshaking failed. 142 .IP 36 143 Bad download resume. Couldn't continue an earlier aborted download. 144 .IP 37 145 FILE couldn't read file. Failed to open the file. Permissions? 146 .IP 38 147 LDAP cannot bind. LDAP bind operation failed. 148 .IP 39 149 LDAP search failed. 150 .IP 41 151 Function not found. A required LDAP function was not found. 152 .IP 42 153 Aborted by callback. An application told curl to abort the operation. 154 .IP 43 155 Internal error. A function was called with a bad parameter. 156 .IP 45 157 Interface error. A specified outgoing interface could not be used. 158 .IP 47 159 Too many redirects. When following redirects, curl hit the maximum amount. 160 .IP 48 161 Unknown option specified to libcurl. This indicates that you passed a weird 162 option to curl that was passed on to libcurl and rejected. Read up in the 163 manual! 164 .IP 49 165 Malformed telnet option. 166 .IP 51 167 The peer's SSL certificate or SSH MD5 fingerprint was not OK. 168 .IP 52 169 The server didn't reply anything, which here is considered an error. 170 .IP 53 171 SSL crypto engine not found. 172 .IP 54 173 Cannot set SSL crypto engine as default. 174 .IP 55 175 Failed sending network data. 176 .IP 56 177 Failure in receiving network data. 178 .IP 58 179 Problem with the local certificate. 180 .IP 59 181 Couldn't use specified SSL cipher. 182 .IP 60 183 Peer certificate cannot be authenticated with known CA certificates. 184 .IP 61 185 Unrecognized transfer encoding. 186 .IP 62 187 Invalid LDAP URL. 188 .IP 63 189 Maximum file size exceeded. 190 .IP 64 191 Requested FTP SSL level failed. 192 .IP 65 193 Sending the data requires a rewind that failed. 194 .IP 66 195 Failed to initialise SSL Engine. 196 .IP 67 197 The user name, password, or similar was not accepted and curl failed to log in. 198 .IP 68 199 File not found on TFTP server. 200 .IP 69 201 Permission problem on TFTP server. 202 .IP 70 203 Out of disk space on TFTP server. 204 .IP 71 205 Illegal TFTP operation. 206 .IP 72 207 Unknown TFTP transfer ID. 208 .IP 73 209 File already exists (TFTP). 210 .IP 74 211 No such user (TFTP). 212 .IP 75 213 Character conversion failed. 214 .IP 76 215 Character conversion functions required. 216 .IP 77 217 Problem with reading the SSL CA cert (path? access rights?). 218 .IP 78 219 The resource referenced in the URL does not exist. 220 .IP 79 221 An unspecified error occurred during the SSH session. 222 .IP 80 223 Failed to shut down the SSL connection. 224 .IP 82 225 Could not load CRL file, missing or wrong format (added in 7.19.0). 226 .IP 83 227 Issuer check failed (added in 7.19.0). 228 .IP 84 229 The FTP PRET command failed 230 .IP 85 231 RTSP: mismatch of CSeq numbers 232 .IP 86 233 RTSP: mismatch of Session Identifiers 234 .IP 87 235 unable to parse FTP file list 236 .IP 88 237 FTP chunk callback reported error 238 .IP 89 239 No connection available, the session will be queued 240 .IP 90 241 SSL public key does not matched pinned public key 242 .IP 91 243 Invalid SSL certificate status. 244 .IP 92 245 Stream error in HTTP/2 framing layer. 246 .IP XX 247 More error codes will appear here in future releases. The existing ones 248 are meant to never change. 249 .SH AUTHORS / CONTRIBUTORS 250 Daniel Stenberg is the main author, but the whole list of contributors is 251 found in the separate THANKS file. 252 .SH WWW 253 https://curl.haxx.se 254 .SH "SEE ALSO" 255 .BR ftp (1), 256 .BR wget (1) 257
