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>" 24 list of host names that shouldn't go through any proxy. If set to a asterisk 25 \&'*' only, it matches all hosts. 26 27 Since 7.53.0, this environment variable disable the proxy even if specify 28 --proxy option. That is 29 .B NO_PROXY=direct.example.com curl -x http://proxy.example.com 30 .B http://direct.example.com 31 accesses the target URL directly, and 32 .B NO_PROXY=direct.example.com curl -x http://proxy.example.com 33 .B http://somewhere.example.com 34 accesses the target URL through proxy. 35 36 .SH "PROXY PROTOCOL PREFIXES" 37 Since curl version 7.21.7, the proxy string may be specified with a 38 protocol:// prefix to specify alternative proxy protocols. 39 40 If no protocol is specified in the proxy string or if the string doesn't match 41 a supported one, the proxy will be treated as an HTTP proxy. 42 43 The supported proxy protocol prefixes are as follows: 44 .IP "http://" 45 Makes it use it as a HTTP proxy. The default if no scheme prefix is used. 46 .IP "https://" 47 Makes it treated as a \fBHTTPS\fP proxy. 48 .IP "socks4://" 49 Makes it the equivalent of --socks4 50 .IP "socks4a://" 51 Makes it the equivalent of --socks4a 52 .IP "socks5://" 53 Makes it the equivalent of --socks5 54 .IP "socks5h://" 55 Makes it the equivalent of --socks5-hostname 56 .SH EXIT CODES 57 There are a bunch of different error codes and their corresponding error 58 messages that may appear during bad conditions. At the time of this writing, 59 the exit codes are: 60 .IP 1 61 Unsupported protocol. This build of curl has no support for this protocol. 62 .IP 2 63 Failed to initialize. 64 .IP 3 65 URL malformed. The syntax was not correct. 66 .IP 4 67 A feature or option that was needed to perform the desired request was not 68 enabled or was explicitly disabled at build-time. To make curl able to do 69 this, you probably need another build of libcurl! 70 .IP 5 71 Couldn't resolve proxy. The given proxy host could not be resolved. 72 .IP 6 73 Couldn't resolve host. The given remote host was not resolved. 74 .IP 7 75 Failed to connect to host. 76 .IP 8 77 Weird server reply. The server sent data curl couldn't parse. 78 .IP 9 79 FTP access denied. The server denied login or denied access to the particular 80 resource or directory you wanted to reach. Most often you tried to change to a 81 directory that doesn't exist on the server. 82 .IP 10 83 FTP accept failed. While waiting for the server to connect back when an active 84 FTP session is used, an error code was sent over the control connection or 85 similar. 86 .IP 11 87 FTP weird PASS reply. Curl couldn't parse the reply sent to the PASS request. 88 .IP 12 89 During an active FTP session while waiting for the server to connect back to 90 curl, the timeout expired. 91 .IP 13 92 FTP weird PASV reply, Curl couldn't parse the reply sent to the PASV request. 93 .IP 14 94 FTP weird 227 format. Curl couldn't parse the 227-line the server sent. 95 .IP 15 96 FTP can't get host. Couldn't resolve the host IP we got in the 227-line. 97 .IP 16 98 HTTP/2 error. A problem was detected in the HTTP2 framing layer. This is 99 somewhat generic and can be one out of several problems, see the error message 100 for details. 101 .IP 17 102 FTP couldn't set binary. Couldn't change transfer method to binary. 103 .IP 18 104 Partial file. Only a part of the file was transferred. 105 .IP 19 106 FTP couldn't download/access the given file, the RETR (or similar) command 107 failed. 108 .IP 21 109 FTP quote error. A quote command returned error from the server. 110 .IP 22 111 HTTP page not retrieved. The requested url was not found or returned another 112 error with the HTTP error code being 400 or above. This return code only 113 appears if --fail is used. 114 .IP 23 115 Write error. Curl couldn't write data to a local filesystem or similar. 116 .IP 25 117 FTP couldn't STOR file. The server denied the STOR operation, used for FTP 118 uploading. 119 .IP 26 120 Read error. Various reading problems. 121 .IP 27 122 Out of memory. A memory allocation request failed. 123 .IP 28 124 Operation timeout. The specified time-out period was reached according to the 125 conditions. 126 .IP 30 127 FTP PORT failed. The PORT command failed. Not all FTP servers support the PORT 128 command, try doing a transfer using PASV instead! 129 .IP 31 130 FTP couldn't use REST. The REST command failed. This command is used for 131 resumed FTP transfers. 132 .IP 33 133 HTTP range error. The range "command" didn't work. 134 .IP 34 135 HTTP post error. Internal post-request generation error. 136 .IP 35 137 SSL connect error. The SSL handshaking failed. 138 .IP 36 139 Bad download resume. Couldn't continue an earlier aborted download. 140 .IP 37 141 FILE couldn't read file. Failed to open the file. Permissions? 142 .IP 38 143 LDAP cannot bind. LDAP bind operation failed. 144 .IP 39 145 LDAP search failed. 146 .IP 41 147 Function not found. A required LDAP function was not found. 148 .IP 42 149 Aborted by callback. An application told curl to abort the operation. 150 .IP 43 151 Internal error. A function was called with a bad parameter. 152 .IP 45 153 Interface error. A specified outgoing interface could not be used. 154 .IP 47 155 Too many redirects. When following redirects, curl hit the maximum amount. 156 .IP 48 157 Unknown option specified to libcurl. This indicates that you passed a weird 158 option to curl that was passed on to libcurl and rejected. Read up in the 159 manual! 160 .IP 49 161 Malformed telnet option. 162 .IP 51 163 The peer's SSL certificate or SSH MD5 fingerprint was not OK. 164 .IP 52 165 The server didn't reply anything, which here is considered an error. 166 .IP 53 167 SSL crypto engine not found. 168 .IP 54 169 Cannot set SSL crypto engine as default. 170 .IP 55 171 Failed sending network data. 172 .IP 56 173 Failure in receiving network data. 174 .IP 58 175 Problem with the local certificate. 176 .IP 59 177 Couldn't use specified SSL cipher. 178 .IP 60 179 Peer certificate cannot be authenticated with known CA certificates. 180 .IP 61 181 Unrecognized transfer encoding. 182 .IP 62 183 Invalid LDAP URL. 184 .IP 63 185 Maximum file size exceeded. 186 .IP 64 187 Requested FTP SSL level failed. 188 .IP 65 189 Sending the data requires a rewind that failed. 190 .IP 66 191 Failed to initialise SSL Engine. 192 .IP 67 193 The user name, password, or similar was not accepted and curl failed to log in. 194 .IP 68 195 File not found on TFTP server. 196 .IP 69 197 Permission problem on TFTP server. 198 .IP 70 199 Out of disk space on TFTP server. 200 .IP 71 201 Illegal TFTP operation. 202 .IP 72 203 Unknown TFTP transfer ID. 204 .IP 73 205 File already exists (TFTP). 206 .IP 74 207 No such user (TFTP). 208 .IP 75 209 Character conversion failed. 210 .IP 76 211 Character conversion functions required. 212 .IP 77 213 Problem with reading the SSL CA cert (path? access rights?). 214 .IP 78 215 The resource referenced in the URL does not exist. 216 .IP 79 217 An unspecified error occurred during the SSH session. 218 .IP 80 219 Failed to shut down the SSL connection. 220 .IP 82 221 Could not load CRL file, missing or wrong format (added in 7.19.0). 222 .IP 83 223 Issuer check failed (added in 7.19.0). 224 .IP 84 225 The FTP PRET command failed 226 .IP 85 227 RTSP: mismatch of CSeq numbers 228 .IP 86 229 RTSP: mismatch of Session Identifiers 230 .IP 87 231 unable to parse FTP file list 232 .IP 88 233 FTP chunk callback reported error 234 .IP 89 235 No connection available, the session will be queued 236 .IP 90 237 SSL public key does not matched pinned public key 238 .IP 91 239 Invalid SSL certificate status. 240 .IP 92 241 Stream error in HTTP/2 framing layer. 242 .IP XX 243 More error codes will appear here in future releases. The existing ones 244 are meant to never change. 245 .SH AUTHORS / CONTRIBUTORS 246 Daniel Stenberg is the main author, but the whole list of contributors is 247 found in the separate THANKS file. 248 .SH WWW 249 https://curl.haxx.se 250 .SH "SEE ALSO" 251 .BR ftp (1), 252 .BR wget (1) 253
