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diff --git a/docs/FAQ b/docs/FAQ new file mode 100644 index 000000000..1a9fec3dc --- /dev/null +++ b/docs/FAQ @@ -0,0 +1,85 @@ + _ _ ____ _ + ___| | | | _ \| | + / __| | | | |_) | | + | (__| |_| | _ <| |___ + \___|\___/|_| \_\_____| + +FAQ + +Problems connecting to SSL servers. +=================================== + + It took a very long time before I could sort out why curl had problems + to connect to certain SSL servers when using SSLeay or OpenSSL v0.9+. + The error sometimes showed up similar to: + + 16570:error:1407D071:SSL routines:SSL2_READ:bad mac decode:s2_pkt.c:233: + + It turned out to be because many older SSL servers don't deal with SSLv3 + requests properly. To correct this problem, tell curl to select SSLv2 from + the command line (-2/--sslv2). + + I have also seen examples where the remote server didn't like the SSLv2 + request and instead you had to force curl to use SSLv3 with -3/--sslv3. + +Does curl support resume? +========================= + + Yes. Both ways on FTP, download ways on HTTP. + +Is libcurl thread safe? +======================= + + Yes, as far as curl's own code goes. It does use system calls that often + aren't thread safe in most environments, such as gethostbyname(). + + I am very interested in once and for all getting some kind of report or + README file from those who have used libcurl in a threaded environment, + since I haven't and I get this question more and more frequently! + +Why doesn't my posting using -F work? +===================================== + + You can't simply use -F or -d at your choice. The web server that will + receive your post assumes one of the formats. If the form you're trying to + "fake" sets the type to 'multipart/form-data', than and only then you must + use the -F type. In all the most common cases, you should use -d which then + causes a posting with the type 'application/x-www-form-urlencoded'. + +Does curl support custom FTP commands? +====================================== + + Yes it does, you can tell curl to perform optional commands both before + and/or after a file transfer. Study the -Q/--quote option. + + Since curl is used for file transfers, you don't use curl to just perform + ftp commands without transfering anything. Therefore you must always specify + a URL to transfer to/from even when doing custom FTP commands. + +Does curl work with other SSL libraries? +======================================== + + Curl has been written to use OpenSSL, although I doubt there would be much + problems using a different library. I just don't know any other free one and + that has limited my possibilities to develop against anything else. + + If anyone does "port" curl to use a commercial SSL library, I am of course + very interested in getting the patch! + +configre doesn't find OpenSSL even when it is installed +======================================================= + + Platforms: Solaris (native cc compiler) and HPUX (native cc compiler) + + When configuring curl, I specify --with-ssl. OpenSSL is installed in + /usr/local/ssl Configure reports SSL in /usr/local/ssl, but fails to find + CRYPTO_lock in -lcrypto + + Cause: The cc for this test places the -L/usr/local/ssl/lib AFTER -lcrypto, + so ld can't find the library. This is due to a bug in the GNU autoconf tool. + + Workaround: Specifying "LDFLAGS=-L/usr/local/ssl/lib" in front of ./configure + places the -L/usr/local/ssl/lib early enough in the command line to make + things work + + Submitted by: Bob Allison <allisonb@users.sourceforge.net> |