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1.9 Where do I buy commercial support for curl? 1.10 How many are using curl? 6.7 What are my obligations when using libcurl in my commerical apps? Edited a few other paragraphs slightly.
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Daniel Stenberg
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docs/FAQ
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docs/FAQ
@ -1,4 +1,4 @@
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Updated: August 26, 2005 (http://curl.haxx.se/docs/faq.html)
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zUpdated: November 2, 2005 (http://curl.haxx.se/docs/faq.html)
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_ _ ____ _
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/ __| | | | |_) | |
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@ -16,6 +16,8 @@ FAQ
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1.6 What do you get for making curl?
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1.7 What about CURL from curl.com?
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1.8 I have a problem who do I mail?
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1.9 Where do I buy commercial support for curl?
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1.10 How many are using curl?
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2. Install Related Problems
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2.1 configure doesn't find OpenSSL even when it is installed
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@ -88,6 +90,7 @@ FAQ
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6.4 I have a program that uses LGPL libraries, can I use libcurl?
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6.5 Can I modify curl/libcurl for my program and keep the changes secret?
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6.6 Can you please change the curl/libcurl license to XXXX?
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6.7 What are my obligations when using libcurl in my commerical apps?
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7. PHP/CURL Issues
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7.1 What is PHP/CURL?
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@ -148,6 +151,10 @@ FAQ
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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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libcurl is most probably the most portable, most powerful and most often
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used C-based multi-platform file transfer library on this planet - be it
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open source or commercial.
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1.3 What is curl not?
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Curl is *not* a wget clone. That is a common misconception. Never, during
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@ -205,7 +212,7 @@ FAQ
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improvements and have them inserted in the main sources (of course on the
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condition that developers agree on that the fixes are good).
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The full list of the more than 400 contributors is found in the docs/THANKS
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The full list of the more than 450 contributors is found in the docs/THANKS
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file.
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curl is developed by a community, with Daniel at the wheel.
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@ -259,6 +266,52 @@ FAQ
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flaw is announced to the world, thus lessen the impact the problem will have
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on existing users.
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1.9 Where do I buy commercial support for curl?
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curl is fully open source. It means you can hire any skilled engineer to fix
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your curl-related problems.
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We list available alternatives on the curl web site:
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http://curl.haxx.se/support.html
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1.10 How many are using curl?
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It is impossible to tell.
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We don't know how many users that knowingly have installed and use curl.
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We don't know how many users that use curl without knowing that they are in
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fact using it.
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We don't know how many users that downloaded or installed curl and then
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never use it.
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Some facts to use as input to the math:
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curl packages have been downloaded from the curl.haxx.se site well over a
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million times. curl is installed by default with most Linux
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distributions. curl is installed by default with Mac OS X. curl and libcurl
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as used by numerous applications that include libcurl binaries in their
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distribution packages (like Adobe Acrobat Reader and Google Earth).
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More than 40 known named companies use curl in commercial environments and
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products. More than 100 known named open source projects depend on
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(lib)curl.
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In a poll on the curl web site mid-2005, more than 50% of the 300+ answers
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estimated a user base of one million users or more.
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In March 2005, the "Linux Counter project" estimated a total Linux user base
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of some 29 millions, while Netcraft detected some 4 million "active" Linux
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based web servers. A guess is that a fair amount of these Linux
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installations have curl installed.
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http://curl.haxx.se/docs/companies.html
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http://curl.haxx.se/docs/programs.html
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http://curl.haxx.se/libcurl/using/apps.html
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http://counter.li.org/estimates.php
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http://news.netcraft.com/archives/2005/03/14/fedora_makes_rapid_progress.html
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2. Install Related Problems
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@ -514,22 +567,24 @@ FAQ
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- Server certificate. The server you communicate with has a server
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certificate. You can and should verify this certificate to make sure that
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you are truly talking to the real server and not a server impersonating
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it. The server certificate verification process is made by using a
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Certificate Authority certificate ("CA cert") that was used to sign the
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server certificate. Server certificate verification is enabled by default
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in curl and libcurl and is often the reason for problems as explained in
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FAQ entry 4.12 and the SSLCERTS document
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(http://curl.haxx.se/docs/sslcerts.html). Server certificates that are
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"self-signed" or otherwise signed by a CA that you do not have a CA cert
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for, cannot be verified. If the verification during a connect fails, you
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are refused access. You then need to explicitly disable the verification
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to connect to the server.
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it.
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- Certificate Authority certificate ("CA cert"). You often have several CA
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certs in a CA cert bundle that can be used to verify a server certificate
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that was signed by one of the authorities in the bundle. curl comes with a
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default CA cert bundle. You can override the default.
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The server certificate verification process is made by using a Certificate
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Authority certificate ("CA cert") that was used to sign the server
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certificate. Server certificate verification is enabled by default in curl
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and libcurl and is often the reason for problems as explained in FAQ entry
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4.12 and the SSLCERTS document
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(http://curl.haxx.se/docs/sslcerts.html). Server certificates that are
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"self-signed" or otherwise signed by a CA that you do not have a CA cert
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for, cannot be verified. If the verification during a connect fails, you
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are refused access. You then need to explicitly disable the verification
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to connect to the server.
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3.17 How do I list the root dir of an FTP server?
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There are two ways. The way defined in the RFC is to use an encoded slash
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@ -546,6 +601,8 @@ FAQ
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No.
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But you could easily write your own program using libcurl to do such stunts.
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4. Running Problems
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@ -751,11 +808,11 @@ FAQ
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curl supports HTTP redirects fine (see item 3.8). Browsers generally support
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at least two other ways to perform directs that curl does not:
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1 - Meta tags. You can write a HTML tag that will cause the browser to
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redirect to another given URL after a certain time.
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- Meta tags. You can write a HTML tag that will cause the browser to
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redirect to another given URL after a certain time.
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2 - Javascript. You can write a javascript program embeded in a HTML page
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that redirects the browser to another given URL.
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- Javascript. You can write a javascript program embeded in a HTML page
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that redirects the browser to another given URL.
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There is no way to make curl follow these redirects. You must either
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manually figure out what the page is set to do, or you write a script that
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@ -793,8 +850,8 @@ FAQ
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One solution to this problem could be to have a pointer to a struct that you
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pass to the callback function. You set the pointer using the
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curl_easy_setopt(CURLOPT_FILE) function. Then that pointer will be passed to
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the callback instead of a FILE * to a file:
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CURLOPT_WRITEDATA option. Then that pointer will be passed to the callback
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instead of a FILE * to a file:
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/* imaginary struct */
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struct MemoryStruct {
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@ -901,7 +958,10 @@ FAQ
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5.9 How does libcurl resolve host names?
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libcurl includes a number of different name resolve functions:
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libcurl supports a large a number of different name resolve functions. One
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of them is picked at build-time and will be used unconditionally. Thus, if
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you want to change name resolver function you must rebuild libcurl and tell
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it to use a different function.
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- The non-ipv6 resolver that can use one out of four host name resolve calls
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(depending on what your system supports):
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@ -914,6 +974,8 @@ FAQ
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- The ipv6-resolver that uses getaddrinfo()
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- The c-ares based name resolver that uses the c-ares library for resolves.
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Using this offers asynchronous name resolves but it currently has no IPv6
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support.
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- The Windows threaded resolver. It use:
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@ -926,8 +988,8 @@ FAQ
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5.10 How do I prevent libcurl from writing the response to stdout?
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libcurl provides a default built-in write function that writes received data
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to stdout. Set a WRITEFUNCTION to receive the data, or possibly set
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WRITEDATA to a different FILE * handle.
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to stdout. Set the CURLOPT_WRITEFUNCTION to receive the data, or possibly
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set CURLOPT_WRITEDATA to a different FILE * handle.
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5.11 How do I make libcurl not receive the whole HTTP response?
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@ -956,6 +1018,9 @@ FAQ
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is just a brief summary for the cases we get the most questions. (Parts of
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this section was much enhanced by Bjorn Reese.)
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We are not lawyers and this is not legal advice. You should probably consult
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one if you want true and accurate legal insights without our prejudice.
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6.1 I have a GPL program, can I use the libcurl library?
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Yes!
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@ -1000,6 +1065,26 @@ FAQ
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libraries that use it. It should be possible for everyone to use libcurl or
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curl in their projects, no matter what license they already have in use.
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6.7 What are my obligations when using libcurl in my commerical apps?
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Next to none. All you need to adhere to is the MIT-style license (stated in
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the COPYING file) which basically says you have to include the copyright
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notice in "all copies" and that you may not use the copyright holder's name
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when promoting your software.
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You do not have to release any of your source code.
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You do not have to reveal or make public any changes to the libcurl source
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code.
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You do not have to reveal or make public that you are using libcurl within
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your app.
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As can be seen here: http://curl.haxx.se/docs/companies.html and
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elsewhere, more and more companies are dicovering the power
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of libcurl and take advantage of it even in commercial environments.
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7. PHP/CURL Issues
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7.1 What is PHP/CURL?
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