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These are problems known to exist at the time of this release. Feel free to
join in and help us correct one or more of these! Also be sure to check the
changelog of the current development status, as one or more of these problems
may have been fixed since this was written!
93. It is not possible to pass a 64-bit value using CURLFORM_CONTENTLEN with
CURLFORM_ARRAY, when compiled on 32-bit platforms that support 64-bit
integers. This is because the underlying structure 'curl_forms' uses a dual
purpose char* for storing these values in via casting. For more information
see the now closed related issue:
https://github.com/curl/curl/issues/608
92. curl tool 7.47.1 in Windows will not --output to literal paths \\?\ or to
reserved dos device names unless the device prefix \\.\ is used. To send
output to a device that has a reserved dos device name you can use the
Windows device prefix (eg: --output \\.\NUL). You can also use the
redirection operator to send output to a literal path or a reserved device
name (eg: > NUL).
The next release of curl will support --output in Windows to literal paths
and to reserved device names without the device prefix.
https://github.com/curl/curl/commit/c3aac48
https://github.com/curl/curl/commit/4fc80f3
91. "curl_easy_perform hangs with imap and PolarSSL"
https://github.com/curl/curl/issues/334
90. IMAP "SEARCH ALL" truncates output on large boxes. "A quick search of the
code reveals that pingpong.c contains some truncation code, at line 408,
when it deems the server response to be too large truncating it to 40
characters"
https://curl.haxx.se/bug/view.cgi?id=1366
89. Disabling HTTP Pipelining when there are ongoing transfers can lead to
heap corruption and crash. https://curl.haxx.se/bug/view.cgi?id=1411
88. libcurl doesn't support CURLINFO_FILETIME for SFTP transfers and thus
curl's -R option also doesn't work then.
87. -J/--remote-header-name doesn't decode %-encoded file names. RFC6266
details how it should be done. The can of worm is basically that we have no
charset handling in curl and ascii >=128 is a challenge for us. Not to
mention that decoding also means that we need to check for nastiness that is
attempted, like "../" sequences and the like. Probably everything to the left
of any embedded slashes should be cut off.
https://curl.haxx.se/bug/view.cgi?id=1294
86. The disconnect commands (LOGOUT and QUIT) may not be sent by IMAP, POP3
and SMTP if a failure occurs during the authentication phase of a
connection.
85. Wrong STARTTRANSFER timer accounting for POST requests
Timer works fine with GET requests, but while using POST the time for
CURLINFO_STARTTRANSFER_TIME is wrong. While using POST
CURLINFO_STARTTRANSFER_TIME minus CURLINFO_PRETRANSFER_TIME is near to zero
every time.
https://github.com/curl/curl/issues/218
https://curl.haxx.se/bug/view.cgi?id=1213
84. CURLINFO_SSL_VERIFYRESULT is only implemented for the OpenSSL and NSS
backends, so relying on this information in a generic app is flaky.
82. When building with the Windows Borland compiler, it fails because the
"tlib" tool doesn't support hyphens (minus signs) in file names and we have
such in the build.
https://curl.haxx.se/bug/view.cgi?id=1222
81. When using -J (with -O), automatically resumed downloading together with
"-C -" fails. Without -J the same command line works! This happens because
the resume logic is worked out before the target file name (and thus its
pre-transfer size) has been figured out!
https://curl.haxx.se/bug/view.cgi?id=1169
80. Curl doesn't recognize certificates in DER format in keychain, but it
works with PEM.
https://curl.haxx.se/bug/view.cgi?id=1065
79. SMTP. When sending data to multiple recipients, curl will abort and return
failure if one of the recipients indicate failure (on the "RCPT TO"
command). Ordinary mail programs would proceed and still send to the ones
that can receive data. This is subject for change in the future.
https://curl.haxx.se/bug/view.cgi?id=1116
75. NTLM authentication involving unicode user name or password only works
properly if built with UNICODE defined together with the WinSSL/schannel
backend. The original problem was mentioned in:
https://curl.haxx.se/mail/lib-2009-10/0024.html
https://curl.haxx.se/bug/view.cgi?id=896
The WinSSL/schannel version verified to work as mentioned in
https://curl.haxx.se/mail/lib-2012-07/0073.html
73. if a connection is made to a FTP server but the server then just never
sends the 220 response or otherwise is dead slow, libcurl will not
acknowledge the connection timeout during that phase but only the "real"
timeout - which may surprise users as it is probably considered to be the
connect phase to most people. Brought up (and is being misunderstood) in:
https://curl.haxx.se/bug/view.cgi?id=856
72. "Pausing pipeline problems."
https://curl.haxx.se/mail/lib-2009-07/0214.html
70. Problem re-using easy handle after call to curl_multi_remove_handle
https://curl.haxx.se/mail/lib-2009-07/0249.html
68. "More questions about ares behavior".
https://curl.haxx.se/mail/lib-2009-08/0012.html
67. When creating multipart formposts. The file name part can be encoded with
something beyond ascii but currently libcurl will only pass in the verbatim
string the app provides. There are several browsers that already do this
encoding. The key seems to be the updated draft to RFC2231:
https://tools.ietf.org/html/draft-reschke-rfc2231-in-http-02
66. When using telnet, the time limitation options don't work.
https://curl.haxx.se/bug/view.cgi?id=846
65. When doing FTP over a socks proxy or CONNECT through HTTP proxy and the
multi interface is used, libcurl will fail if the (passive) TCP connection
for the data transfer isn't more or less instant as the code does not
properly wait for the connect to be confirmed. See test case 564 for a first
shot at a test case.
63. When CURLOPT_CONNECT_ONLY is used, the handle cannot reliably be re-used
for any further requests or transfers. The work-around is then to close that
handle with curl_easy_cleanup() and create a new. Some more details:
https://curl.haxx.se/mail/lib-2009-04/0300.html
61. If an upload using Expect: 100-continue receives an HTTP 417 response,
it ought to be automatically resent without the Expect:. A workaround is
for the client application to redo the transfer after disabling Expect:.
https://curl.haxx.se/mail/archive-2008-02/0043.html
60. libcurl closes the connection if an HTTP 401 reply is received while it
is waiting for the the 100-continue response.
https://curl.haxx.se/mail/lib-2008-08/0462.html
58. It seems sensible to be able to use CURLOPT_NOBODY and
CURLOPT_FAILONERROR with FTP to detect if a file exists or not, but it is
not working: https://curl.haxx.se/mail/lib-2008-07/0295.html
56. When libcurl sends CURLOPT_POSTQUOTE commands when connected to a SFTP
server using the multi interface, the commands are not being sent correctly
and instead the connection is "cancelled" (the operation is considered done)
prematurely. There is a half-baked (busy-looping) patch provided in the bug
report but it cannot be accepted as-is. See
https://curl.haxx.se/bug/view.cgi?id=748
55. libcurl fails to build with MIT Kerberos for Windows (KfW) due to KfW's
library header files exporting symbols/macros that should be kept private
to the KfW library. See ticket #5601 at http://krbdev.mit.edu/rt/
52. Gautam Kachroo's issue that identifies a problem with the multi interface
where a connection can be re-used without actually being properly
SSL-negotiated:
https://curl.haxx.se/mail/lib-2008-01/0277.html
49. If using --retry and the transfer timeouts (possibly due to using -m or
-y/-Y) the next attempt doesn't resume the transfer properly from what was
downloaded in the previous attempt but will truncate and restart at the
original position where it was at before the previous failed attempt. See
https://curl.haxx.se/mail/lib-2008-01/0080.html and Mandriva bug report
https://qa.mandriva.com/show_bug.cgi?id=22565
48. If a CONNECT response-headers are larger than BUFSIZE (16KB) when the
connection is meant to be kept alive (like for NTLM proxy auth), the
function will return prematurely and will confuse the rest of the HTTP
protocol code. This should be very rare.
43. There seems to be a problem when connecting to the Microsoft telnet server.
https://curl.haxx.se/bug/view.cgi?id=649
41. When doing an operation over FTP that requires the ACCT command (but not
when logging in), the operation will fail since libcurl doesn't detect this
and thus fails to issue the correct command:
https://curl.haxx.se/bug/view.cgi?id=635
39. Steffen Rumler's Race Condition in Curl_proxyCONNECT:
https://curl.haxx.se/mail/lib-2007-01/0045.html
38. Kumar Swamy Bhatt's problem in ftp/ssl "LIST" operation:
https://curl.haxx.se/mail/lib-2007-01/0103.html
35. Both SOCKS5 and SOCKS4 proxy connections are done blocking, which is very
bad when used with the multi interface.
34. The SOCKS4 connection codes don't properly acknowledge (connect) timeouts.
Also see #12. According to bug #1556528, even the SOCKS5 connect code does
not do it right: https://curl.haxx.se/bug/view.cgi?id=604
31. "curl-config --libs" will include details set in LDFLAGS when configure is
run that might be needed only for building libcurl. Further, curl-config
--cflags suffers from the same effects with CFLAGS/CPPFLAGS.
26. NTLM authentication using SSPI (on Windows) when (lib)curl is running in
"system context" will make it use wrong(?) user name - at least when compared
to what winhttp does. See https://curl.haxx.se/bug/view.cgi?id=535
23. SOCKS-related problems:
B) libcurl doesn't support FTPS over a SOCKS proxy.
E) libcurl doesn't support active FTP over a SOCKS proxy
We probably have even more bugs and lack of features when a SOCKS proxy is
used.
21. FTP ASCII transfers do not follow RFC959. They don't convert the data
accordingly (not for sending nor for receiving). RFC 959 section 3.1.1.1
clearly describes how this should be done:
The sender converts the data from an internal character representation to
the standard 8-bit NVT-ASCII representation (see the Telnet
specification). The receiver will convert the data from the standard
form to his own internal form.
Since 7.15.4 at least line endings are converted.
16. FTP URLs passed to curl may contain NUL (0x00) in the RFC 1738 <user>,
<password>, and <fpath> components, encoded as "%00". The problem is that
curl_unescape does not detect this, but instead returns a shortened C
string. From a strict FTP protocol standpoint, NUL is a valid character
within RFC 959 <string>, so the way to handle this correctly in curl would
be to use a data structure other than a plain C string, one that can handle
embedded NUL characters. From a practical standpoint, most FTP servers
would not meaningfully support NUL characters within RFC 959 <string>,
anyway (e.g., Unix pathnames may not contain NUL).
14. Test case 165 might fail on a system which has libidn present, but with an
old iconv version (2.1.3 is a known bad version), since it doesn't recognize
the charset when named ISO8859-1. Changing the name to ISO-8859-1 makes the
test pass, but instead makes it fail on Solaris hosts that use its native
iconv.
13. curl version 7.12.2 fails on AIX if compiled with --enable-ares.
The workaround is to combine --enable-ares with --disable-shared
12. When connecting to a SOCKS proxy, the (connect) timeout is not properly
acknowledged after the actual TCP connect (during the SOCKS "negotiate"
phase).
10. To get HTTP Negotiate (SPNEGO) authentication to work fine, you need to
provide a (fake) user name (this concerns both curl and the lib) because the
code wrongly only considers authentication if there's a user name provided.
https://curl.haxx.se/bug/view.cgi?id=440 How?
https://curl.haxx.se/mail/lib-2004-08/0182.html
8. Doing resumed upload over HTTP does not work with '-C -', because curl
doesn't do a HEAD first to get the initial size. This needs to be done
manually for HTTP PUT resume to work, and then '-C [index]'.
6. libcurl ignores empty path parts in FTP URLs, whereas RFC1738 states that
such parts should be sent to the server as 'CWD ' (without an argument).
The only exception to this rule, is that we knowingly break this if the
empty part is first in the path, as then we use the double slashes to
indicate that the user wants to reach the root dir (this exception SHALL
remain even when this bug is fixed).
5. libcurl doesn't treat the content-length of compressed data properly, as
it seems HTTP servers send the *uncompressed* length in that header and
libcurl thinks of it as the *compressed* length. Some explanations are here:
https://curl.haxx.se/mail/lib-2003-06/0146.html
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