mirror of https://github.com/moparisthebest/curl
97 lines
3.9 KiB
Plaintext
97 lines
3.9 KiB
Plaintext
_ _ ____ _
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/ __| | | | |_) | |
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| (__| |_| | _ <| |___
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\___|\___/|_| \_\_____|
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FAQ
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Problems connecting to SSL servers.
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===================================
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It took a very long time before I could sort out why curl had problems
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to connect to certain SSL servers when using SSLeay or OpenSSL v0.9+.
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The error sometimes showed up similar to:
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16570:error:1407D071:SSL routines:SSL2_READ:bad mac decode:s2_pkt.c:233:
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It turned out to be because many older SSL servers don't deal with SSLv3
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requests properly. To correct this problem, tell curl to select SSLv2 from
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the command line (-2/--sslv2).
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I have also seen examples where the remote server didn't like the SSLv2
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request and instead you had to force curl to use SSLv3 with -3/--sslv3.
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Does curl support resume?
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=========================
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Yes. Both ways on FTP, download ways on HTTP.
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Is libcurl thread safe?
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=======================
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Yes, as far as curl's own code goes. It does use system calls that often
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aren't thread safe in most environments, such as gethostbyname().
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I am very interested in once and for all getting some kind of report or
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README file from those who have used libcurl in a threaded environment,
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since I haven't and I get this question more and more frequently!
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Why doesn't my posting using -F work?
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=====================================
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You can't simply use -F or -d at your choice. The web server that will
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receive your post assumes one of the formats. If the form you're trying to
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"fake" sets the type to 'multipart/form-data', than and only then you must
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use the -F type. In all the most common cases, you should use -d which then
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causes a posting with the type 'application/x-www-form-urlencoded'.
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Does curl support custom FTP commands?
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======================================
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Yes it does, you can tell curl to perform optional commands both before
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and/or after a file transfer. Study the -Q/--quote option.
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Since curl is used for file transfers, you don't use curl to just perform
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ftp commands without transfering anything. Therefore you must always specify
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a URL to transfer to/from even when doing custom FTP commands.
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Does curl work with other SSL libraries?
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========================================
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Curl has been written to use OpenSSL, although I doubt there would be much
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problems using a different library. I just don't know any other free one and
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that has limited my possibilities to develop against anything else.
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If anyone does "port" curl to use a commercial SSL library, I am of course
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very interested in getting the patch!
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configre doesn't find OpenSSL even when it is installed
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=======================================================
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Platforms: Solaris (native cc compiler) and HPUX (native cc compiler)
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When configuring curl, I specify --with-ssl. OpenSSL is installed in
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/usr/local/ssl Configure reports SSL in /usr/local/ssl, but fails to find
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CRYPTO_lock in -lcrypto
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Cause: The cc for this test places the -L/usr/local/ssl/lib AFTER -lcrypto,
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so ld can't find the library. This is due to a bug in the GNU autoconf tool.
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Workaround: Specifying "LDFLAGS=-L/usr/local/ssl/lib" in front of ./configure
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places the -L/usr/local/ssl/lib early enough in the command line to make
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things work
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Submitted by: Bob Allison <allisonb@users.sourceforge.net>
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Will you write a script for me getting ZZZ from YYY?
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====================================================
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No.
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I try to help out to solve issues with curl and related stuff, but I really
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do have a lot of stuff on my daily schedule and I'd prefer if you did not
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ask me to do your jobs. Writing scripts is very easy. Using curl might be
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tricky, but once you're past the initial mistakes the road to success is
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very short and straight-forward.
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