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docs/FAQ
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docs/FAQ
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Updated: December 22, 2003 (http://curl.haxx.se/docs/faq.html)
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Updated: March 16, 2004 (http://curl.haxx.se/docs/faq.html)
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\___|\___/|_| \_\_____|
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FAQ
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@ -90,7 +90,7 @@ FAQ
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with URL spelled in uppercase to make it obvious it deals with URLs. The
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fact it can also be pronounced 'see URL' also helped, it works as an
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abbrivation for "Client URL Request Library" or why not the recursive
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version: "Curl is a URL Request Library".
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version: "Curl URL Request Library".
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Curl supports a range of common Internet protocols, currently including
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HTTP, HTTPS, FTP, FTPS, GOPHER, LDAP, DICT, TELNET and FILE.
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@ -101,7 +101,7 @@ FAQ
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NOTE: there are numerous sub-projects and related projects that also use the
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word curl in the project names in various combinations, but you should take
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notice that this FAQ is directed at the command-line tool named curl (and
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libcurl the library), and may therefore not be valid for other curl
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libcurl the library), and may therefore not be valid for other curl-related
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projects.
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1.2 What is libcurl?
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@ -109,16 +109,16 @@ FAQ
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libcurl is a reliable and portable library which provides you with an easy
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interface to a range of common Internet protocols.
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You can use libcurl for free in your application even if it is commercial
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or closed-source.
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You can use libcurl for free in your application, be it open source,
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commercial or closed-source.
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1.3 What is cURL not?
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Curl is *not* a wget clone even though that is a very common misconception.
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Never, during curl's development, have we intended curl to replace wget or
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compete on its market. Curl is targeted at single-shot file transfers.
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Curl is not a web site mirroring program. If you wanna use curl to mirror
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Curl is *not* a wget clone. That is a common misconception. Never, during
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curl's development, have we intended curl to replace wget or compete on its
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market. Curl is targeted at single-shot file transfers.
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Curl is not a web site mirroring program. If you want to use curl to mirror
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something: fine, go ahead and write a script that wraps around curl to make
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it reality (like curlmirror.pl does).
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@ -181,9 +181,8 @@ FAQ
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curl. We do this voluntarily on our spare time.
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We get some help from companies. Contactor Data hosts the curl web site,
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Haxx owns the curl web site's domain and sourceforge.net hosts several
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project services we take advantage from, like the bug tracker, mailing lists
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and more.
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Haxx owns the curl web site's domain and sourceforge.net hosts project
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services we take advantage from, like the bug tracker.
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If you want to support our project with a donation or similar, one way of
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doing that would be to buy "gift certificates" at useful online shopping
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@ -198,7 +197,7 @@ FAQ
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programming language for the web, named CURL.
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We are in no way associated with curl.com or their CURL programming
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language.
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language.
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Our project name curl has been in effective use since 1998. We were not the
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first computer related project to use the name "curl" and do not claim any
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@ -281,8 +280,7 @@ FAQ
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2.4. Does cURL support Socks (RFC 1928) ?
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There is limited support for SOCKS5 for curl built with IPv6 support
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disabled.
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Yes, SOCKS5 is supported when curl is built with IPv6 support disabled.
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3. Usage problems
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@ -414,7 +412,7 @@ FAQ
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put the entire option within quotes. Like in:
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curl -d " with spaces " url.com
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or perhaps
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curl -d ' with spaces ' url.com
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@ -478,7 +476,7 @@ FAQ
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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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There has also been examples where the remote server didn't like the SSLv2
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There have also been 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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4.2. Why do I get problems when I use & or % in the URL?
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@ -554,7 +552,7 @@ FAQ
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containing a list of valid methods for the requested resource.
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4.5.6 "301 Moved Permanently"
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If you get this return code and an HTML output similar to this:
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<H1>Moved Permanently</H1> The document has moved <A
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@ -577,21 +575,26 @@ FAQ
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The first part is to avoid having clear-text passwords in the command line
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so that they don't appear in 'ps' outputs and similar. That is easily
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avoided by using the "-K" option to tell curl to read parameters from a
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file or stdin to which you can pass the secret info.
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avoided by using the "-K" option to tell curl to read parameters from a file
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or stdin to which you can pass the secret info. curl itself will also
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attempt to "hide" the given password by blanking out the option - this
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doesn't work on all platforms.
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To keep the passwords in your account secret from the rest of the world is
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not a task that curl addresses. You could of course encrypt them somehow to
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at least hide them from being read by human eyes, but that is not what
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anyone would call security.
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Also note that regular HTTP and FTP passwords are sent in clear across the
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network. All it takes for anyone to fetch them is to listen on the network.
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Eavesdropping is very easy.
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Also note that regular HTTP (using Basic authentication) and FTP passwords
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are sent in clear across the network. All it takes for anyone to fetch them
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is to listen on the network. Eavesdropping is very easy. Use more secure
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authentication methods (like Digest, Negotiate or even NTLM) or consider the
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SSL-based alternatives HTTPS and FTPS.
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4.8 I found a bug!
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It is not a bug if the behavior is documented. Read the docs first.
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Especially check out the KNOWN_BUGS file, it may be a documented bug!
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If it is a problem with a binary you've downloaded or a package for your
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particular platform, try contacting the person who built the package/archive
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@ -629,7 +632,7 @@ FAQ
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You invoke curl 7.10 or later to communicate on a https:// URL and get an
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error back looking something similar to this:
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curl: (35) SSL: error:14090086:SSL routines:
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curl: (35) SSL: error:14090086:SSL routines:
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SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
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Then it means that curl couldn't verify that the server's certificate was
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@ -686,7 +689,7 @@ FAQ
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{
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register int realsize = size * nmemb;
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struct MemoryStruct *mem = (struct MemoryStruct *)data;
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mem->memory = (char *)realloc(mem->memory, mem->size + realsize + 1);
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if (mem->memory) {
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memcpy(&(mem->memory[mem->size]), ptr, realsize);
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