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big last-beta (?) cleanup commit

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Daniel Stenberg
2000-07-31 22:42:34 +00:00
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@@ -121,106 +121,139 @@ FAQ
9. Why do I get problems when I use & in the URL?
In general unix shells, the & letter is treated special and when used it
runs the specified command in the background. To safely send the & as a
part of a URL, you should qoute the entire URL by using single (') or
double (") quotes around it.
In general unix shells, the & letter is treated special and when used it
runs the specified command in the background. To safely send the & as a part
of a URL, you should qoute the entire URL by using single (') or double (")
quotes around it.
An example that would invoke a remote CGI that uses &-letters could be:
An example that would invoke a remote CGI that uses &-letters could be:
curl 'http://www.altavista.com/cgi-bin/query?text=yes&q=curl'
10. How can I use {, }, [ or ] to specify multiple URLs?
Because those letters have a special meaning to the shell, and to be used
in a URL specified to curl you must quote them.
Because those letters have a special meaning to the shell, and to be used in
a URL specified to curl you must quote them.
An example that downloads two URLs (sequentially) would do:
An example that downloads two URLs (sequentially) would do:
curl '{curl,www}.haxx.se'
11. Where can I find a copy of LIBEAY32.DLL?
That is an OpenSSL binary built for Windows.
That is an OpenSSL binary built for Windows.
Curl uses OpenSSL to do the SSL stuff. The LIBEAY32.DLL is what curl needs
on a windows machine to do https://. Check out the curl web page to find
accurate and up-to-date pointers to recent OpenSSL DDLs and other binary
packages.
Curl uses OpenSSL to do the SSL stuff. The LIBEAY32.DLL is what curl needs
on a windows machine to do https://. Check out the curl web page to find
accurate and up-to-date pointers to recent OpenSSL DDLs and other binary
packages.
12. Why do I get downloaded data even though the web page doesn't exist?
Curl asks remote servers for the page you specify. If the page doesn't
exist at the server, the HTTP protocol defines how the server should
respond and that means that headers and a "page" will be returned. That's
simply how HTTP works.
Curl asks remote servers for the page you specify. If the page doesn't exist
at the server, the HTTP protocol defines how the server should respond and
that means that headers and a "page" will be returned. That's simply how
HTTP works.
By using the --fail option you can tell curl explicitly to not get any data
if the HTTP return code doesn't say success.
By using the --fail option you can tell curl explicitly to not get any data
if the HTTP return code doesn't say success.
13. Why do I get "HTTP/1.1 403 Forbidden" from a http server?
RFC2616 clearly explains this return code:
RFC2616 clearly explains this return code:
10.4.4 403 Forbidden
10.4.4 403 Forbidden
The server understood the request, but is refusing to fulfill it.
Authorization will not help and the request SHOULD NOT be repeated.
If the request method was not HEAD and the server wishes to make
public why the request has not been fulfilled, it SHOULD describe the
reason for the refusal in the entity. If the server does not wish to
make this information available to the client, the status code 404
(Not Found) can be used instead.
The server understood the request, but is refusing to fulfill it.
Authorization will not help and the request SHOULD NOT be repeated. If the
request method was not HEAD and the server wishes to make public why the
request has not been fulfilled, it SHOULD describe the reason for the
refusal in the entity. If the server does not wish to make this information
available to the client, the status code 404 (Not Found) can be used
instead.
14. How can I disable the Pragma: nocache header?
You can change all internally generated headers by adding a replacement
with the -H/--header option. By adding a header with empty contents you
safelt disables the headers. Use -H "Pragma:" to disable that specific
header.
You can change all internally generated headers by adding a replacement with
the -H/--header option. By adding a header with empty contents you safelt
disables the headers. Use -H "Pragma:" to disable that specific header.
15. Can you tell me what error code 142 means?
All error codes that are larger than the highest documented error code
means that curl has existed due to a timeout. There is currentl no nice way
for curl to abort from such a condition and that's why it gets this
undocumented error. This is planned to change in a future release.
All error codes that are larger than the highest documented error code means
that curl has existed due to a timeout. There is currentl no nice way for
curl to abort from such a condition and that's why it gets this undocumented
error. This is planned to change in a future release.
16. How do I keep usernames and passwords secret in Curl command lines?
I see this problem as two parts:
I see this problem as two parts:
The first part is to avoid having clear-text passwords in the command line
so that they don't appear in 'ps' outputs and similar. That is easily
avoided by using the "-K" option that tells curl to read parameters from a
file or stdin to which you can pass the secret info.
The first part is to avoid having clear-text passwords in the command line
so that they don't appear in 'ps' outputs and similar. That is easily
avoided by using the "-K" option tho tell curl to read parameters from a
file or stdin to which you can pass the secret info.
To keep the passwords in your account secret from the rest of the world is
not a task that curl addresses. You could of course encrypt them somehow to
at least hide them from being read by human eyes, but that is not what
anyone would call security.
To keep the passwords in your account secret from the rest of the world is
not a task that curl addresses. You could of course encrypt them somehow to
at least hide them from being read by human eyes, but that is not what
anyone would call security.
17. Does curl support javascript, ASP, XML, XHTML or HTML version Y?
To curl, all contents are alike. It doesn't matter how the page was
generated. It may be ASP, PHP, perl, shell-script, SSI or plain
HTML-files. There's no difference to curl and it doesn't even know what
kind of language that generated the page.
To curl, all contents are alike. It doesn't matter how the page was
generated. It may be ASP, PHP, perl, shell-script, SSI or plain
HTML-files. There's no difference to curl and it doesn't even know what kind
of language that generated the page.
Javascript is slightly different since that is code embedded in the HTML
that is sent for the client to interpret and curl has no javascript
interpreter.
Javascript is slightly different since that is code embedded in the HTML
that is sent for the client to interpret and curl has no javascript
interpreter.
18. Does cURL support Socks (RFC 1928) ?
No. Nobody has wanted it that badly yet. I would appriciate patches that
brings this functionality.
No. Nobody has wanted it that badly yet. I would appriciate patches that
brings this functionality.
19. Can I use curl to delete/rename a file through FTP?
Yes. You specify custom ftp commands with -Q/--quote.
Yes. You specify custom ftp commands with -Q/--quote.
One example would be to delete a file after you have downloaded it:
One example would be to delete a file after you have downloaded it:
curl -O ftp://download.com/coolfile -Q '-DELE coolfile'
20. Can I use curl/libcurl in my program licensed under XXX?
Curl and libcurl are released under the MPL, the Mozilla Public License. To
get a really good answer to this or other licensing questions, you should
study the MPL license and the license you are about to use and check for
clashes yourself. This is a brief summary for a few cases for which we get
questions:
I have a GPL program, can I use the libcurl library?
No. GPL'd software requires all parts of the final executable to be
licensed under GPL.
I have a closed-source program, can I use the libcurl library?
Yes, libcurl does not put any restrictions on the program that uses the
library. If you end up doing changes to the library, only those changes
must be made available, not the ones to your program.
I have a program that uses LGPL libraries, can I use libcurl?
Yes you can. LGPL libraries don't spread to other libraries the same way
GPL ones do.
Can I modify curl/libcurl for my own program and keep the changes secret?
No, you're not allowed to do that.
Can you please change the curl/libcurl license to XXXX?
No. We carefully picked this license years ago and a large amount of
people have contributed with source code knowing that this is the license
we use. This license puts the restrictions we want on curl/libcurl and it
does not spread to other programs or libraries.