curl exit codes

gistfile1.txt

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 similar) 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 download."
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 operation."
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 maximum 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 certificates."
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."

With the short description code: https://curl.se/libcurl/c/libcurl-errors.html