Validate External Links/Curl codes
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ValExtLinks uses the Unix tool 'curl' to query each link. These are the return values which can come from 'curl', taken from its man page. These codes appear in parentheses after the three-digit HTTP response code for each link (except EI and IW links).
EXIT CODES
1 Unsupported protocol. This build of curl has no support for this
protocol.
2 Failed to initialize.
3 URL malformed. The syntax was not correct.
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!
5 Couldn't resolve proxy. The given proxy host could not be
resolved.
6 Couldn't resolve host. The given remote host was not resolved.
7 Failed to connect to host.
8 Weird server reply. The server sent data curl couldn't parse.
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.
10 FTP accept failed. While waiting for the server to connect back
when an active FTP session is used, an error code was sent over
the control connection or similar.
11 FTP weird PASS reply. Curl couldn't parse the reply sent to the
PASS request.
12 During an active FTP session while waiting for the server to
connect back to curl, the timeout expired.
13 FTP weird PASV reply, Curl couldn't parse the reply sent to the
PASV request.
14 FTP weird 227 format. Curl couldn't parse the 227-line the
server sent.
15 FTP can't get host. Couldn't resolve the host IP we got in the
227-line.
16 HTTP/2 error. A problem was detected in the HTTP2 framing layer.
This is somewhat generic and can be one out of several problems,
see the error message for details.
17 FTP couldn't set binary. Couldn't change transfer method to
binary.
18 Partial file. Only a part of the file was transferred.
19 FTP couldn't download/access the given file, the RETR (or simi-
lar) command failed.
21 FTP quote error. A quote command returned error from the server.
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 -f, --fail is used.
23 Write error. Curl couldn't write data to a local filesystem or
similar.
25 FTP couldn't STOR file. The server denied the STOR operation,
used for FTP uploading.
26 Read error. Various reading problems.
27 Out of memory. A memory allocation request failed.
28 Operation timeout. The specified time-out period was reached
according to the conditions.
30 FTP PORT failed. The PORT command failed. Not all FTP servers
support the PORT command, try doing a transfer using PASV
instead!
31 FTP couldn't use REST. The REST command failed. This command is
used for resumed FTP transfers.
33 HTTP range error. The range "command" didn't work.
34 HTTP post error. Internal post-request generation error.
35 SSL connect error. The SSL handshaking failed.
36 Bad download resume. Couldn't continue an earlier aborted down-
load.
37 FILE couldn't read file. Failed to open the file. Permissions?
38 LDAP cannot bind. LDAP bind operation failed.
39 LDAP search failed.
41 Function not found. A required LDAP function was not found.
42 Aborted by callback. An application told curl to abort the oper-
ation.
43 Internal error. A function was called with a bad parameter.
45 Interface error. A specified outgoing interface could not be
used.
47 Too many redirects. When following redirects, curl hit the maxi-
mum amount.
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!
49 Malformed telnet option.
51 The peer's SSL certificate or SSH MD5 fingerprint was not OK.
52 The server didn't reply anything, which here is considered an
error.
53 SSL crypto engine not found.
54 Cannot set SSL crypto engine as default.
55 Failed sending network data.
56 Failure in receiving network data.
58 Problem with the local certificate.
59 Couldn't use specified SSL cipher.
60 Peer certificate cannot be authenticated with known CA certifi-
cates.
61 Unrecognized transfer encoding.
62 Invalid LDAP URL.
63 Maximum file size exceeded.
64 Requested FTP SSL level failed.
65 Sending the data requires a rewind that failed.
66 Failed to initialise SSL Engine.
67 The user name, password, or similar was not accepted and curl
failed to log in.
68 File not found on TFTP server.
69 Permission problem on TFTP server.
70 Out of disk space on TFTP server.
71 Illegal TFTP operation.
72 Unknown TFTP transfer ID.
73 File already exists (TFTP).
74 No such user (TFTP).
75 Character conversion failed.
76 Character conversion functions required.
77 Problem with reading the SSL CA cert (path? access rights?).
78 The resource referenced in the URL does not exist.
79 An unspecified error occurred during the SSH session.
80 Failed to shut down the SSL connection.
82 Could not load CRL file, missing or wrong format (added in
7.19.0).
83 Issuer check failed (added in 7.19.0).
84 The FTP PRET command failed
85 RTSP: mismatch of CSeq numbers
86 RTSP: mismatch of Session Identifiers
87 unable to parse FTP file list
88 FTP chunk callback reported error
89 No connection available, the session will be queued
90 SSL public key does not matched pinned public key
91 Invalid SSL certificate status.
92 Stream error in HTTP/2 framing layer.