Curlopt_Proxy

CURLOPT_PROXY

Name
CURLOPT_PROXY – proxy to use Synopsis
#include
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY, char *proxy); Description
Set the proxy to use for the upcoming request. The parameter should be a char * to a null-terminated string holding the host name or dotted numerical IP address. A numerical IPv6 address must be written within [brackets].
To specify port number in this string, append:[port] to the end of the host name. The proxy’s port number may optionally be specified with the separate option CURLOPT_PROXYPORT. If not specified, libcurl will default to using port 1080 for proxies.
The proxy string may be prefixed with [scheme] to specify which kind of proxy is used.
HTTP Proxy. Default when no scheme or proxy type is specified.
HTTPS Proxy. (Added in 7. 52. 0 for OpenSSL, GnuTLS and NSS)
socks4
SOCKS4 Proxy.
socks4a
SOCKS4a Proxy. Proxy resolves URL hostname.
socks5
SOCKS5 Proxy.
socks5h
SOCKS5 Proxy. Proxy resolves URL hostname.
Without a scheme prefix, CURLOPT_PROXYTYPE can be used to specify which kind of proxy the string identifies.
When you tell the library to use an HTTP proxy, libcurl will transparently convert operations to HTTP even if you specify an FTP URL etc. This may have an impact on what other features of the library you can use, such as CURLOPT_QUOTE and similar FTP specifics that don’t work unless you tunnel through the HTTP proxy. Such tunneling is activated with CURLOPT_HTTPPROXYTUNNEL.
Setting the proxy string to “” (an empty string) will explicitly disable the use of a proxy, even if there is an environment variable set for it.
A proxy host string can also include protocol scheme () and embedded user + password.
The application does not have to keep the string around after setting this option. Environment variables
libcurl respects the proxy environment variables named _proxy, ftp_proxy, sftp_proxy etc. If set, libcurl will use the specified proxy for that URL scheme. So for a “FTP” URL, the ftp_proxy is considered. all_proxy is used if no protocol specific proxy was set.
If no_proxy (or NO_PROXY) is set, it is the exact equivalent of setting the CURLOPT_NOPROXY option.
The CURLOPT_PROXY and CURLOPT_NOPROXY options override environment variables. Default
Default is NULL, meaning no proxy is used.
When you set a host name to use, do not assume that there’s any particular single port number used widely for proxies. Specify it! Protocols
All except file. Note that some protocols don’t do very well over proxy. Example
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, “);
curl_easy_setopt(curl, CURLOPT_PROXY, “proxy:80”);
curl_easy_perform(curl);}
Availability
Since 7. 14. 1 the proxy environment variable names can include the protocol scheme.
Since 7. 21. 7 the proxy string supports the socks protocols as “schemes”.
Since 7. 50. 2, unsupported schemes in proxy strings cause libcurl to return error. Return value
Returns CURLE_OK if proxies are supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space. See also
CURLOPT_PROXYPORT(3), CURLOPT_HTTPPROXYTUNNEL(3), CURLOPT_PROXYTYPE(3)
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CURLOPT_PROXY - man pages section 3: Library Interfaces ...

CURLOPT_PROXY – man pages section 3: Library Interfaces …

CURLOPT_PROXY
(3)
NameCURLOPT_PROXY – set proxy to use
Synopsis
#include
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY, char *proxy);
Description
CURLOPT_PROXY(3) curl_easy_setopt options CURLOPT_PROXY(3)
NAME
CURLOPT_PROXY – set proxy to use
SYNOPSIS
DESCRIPTION
Set the proxy to use for the upcoming request. The parameter should be
a char * to a zero terminated string holding the host name or dotted
numerical IP address. A numerical IPv6 address must be written within
[brackets].
To specify port number in this string, append:[port] to the end of the
host name. The proxy’s port number may optionally be specified with the
separate option CURLOPT_PROXYPORT(3). If not specified, libcurl will
default to using port 1080 for proxies.
The proxy string may be prefixed with [scheme] to specify which kind
of proxy is used.
HTTP Proxy. Default when no scheme or proxy type is spec-
ified.
HTTPS Proxy. (Added in 7. 52. 0 for OpenSSL, GnuTLS and
NSS)
socks4
SOCKS4 Proxy.
socks4a
SOCKS4a Proxy. Proxy resolves URL hostname.
socks5
SOCKS5 Proxy.
socks5h
SOCKS5 Proxy. Proxy resolves URL hostname.
Without a scheme prefix, CURLOPT_PROXYTYPE(3) can be used to specify
which kind of proxy the string identifies.
When you tell the library to use an HTTP proxy, libcurl will transpar-
ently convert operations to HTTP even if you specify an FTP URL etc.
This may have an impact on what other features of the library you can
use, such as CURLOPT_QUOTE(3) and similar FTP specifics that don’t work
unless you tunnel through the HTTP proxy. Such tunneling is activated
with CURLOPT_HTTPPROXYTUNNEL(3).
Setting the proxy string to “” (an empty string) will explicitly dis-
able the use of a proxy, even if there is an environment variable set
for it.
A proxy host string can also include protocol scheme () and
embedded user + password.
The application does not have to keep the string around after setting
this option.
Environment variables
libcurl respects the proxy environment variables named _proxy,
ftp_proxy, sftp_proxy etc. If set, libcurl will use the specified proxy
for that URL scheme. So for a “FTP” URL, the ftp_proxy is consid-
ered. all_proxy is used if no protocol specific proxy was set.
If no_proxy (or NO_PROXY) is set, it can specify a list of host names
to not use a proxy for (even if one of the previous mention variables
are set). That is the exact equivalent of setting the CUR-
LOPT_NOPROXY(3) option.
The CURLOPT_PROXY(3) and CURLOPT_NOPROXY(3) options override environ-
ment variables.
DEFAULT
Default is NULL, meaning no proxy is used.
When you set a host name to use, do not assume that there’s any partic-
ular single port number used widely for proxies. Specify it!
PROTOCOLS
All except file. Note that some protocols don’t do very well over
proxy.
EXAMPLE
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, “);
curl_easy_setopt(curl, CURLOPT_PROXY, “proxy:80”);
curl_easy_perform(curl);}
AVAILABILITY
Since 7. 14. 1 the proxy environment variable names can include the pro-
tocol scheme.
Since 7. 21. 7 the proxy string supports the socks protocols as
“schemes”.
Since 7. 50. 2, unsupported schemes in proxy strings cause libcurl to
return error.
RETURN VALUE
Returns CURLE_OK if proxies are supported, CURLE_UNKNOWN_OPTION if not,
or CURLE_OUT_OF_MEMORY if there was insufficient heap space.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+—————+——————+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|Availability | web/curl |
|Stability | Uncommitted |
SEE ALSO
CURLOPT_PROXYPORT(3), CURLOPT_HTTPPROXYTUNNEL(3), CURLOPT_PROXYTYPE(3)
NOTES
This software was built from source available at. The original community
source was downloaded from chive/
Further information about this software can be found on the open source
community website at
libcurl 7. 37. 0 17 Jun 2014 CURLOPT_PROXY(3)
How to use CURL via a proxy? - Stack Overflow

How to use CURL via a proxy? – Stack Overflow

I am looking to set curl to use a proxy server. The url is provided by an html form, which has not been a problem. Without the proxy it works fine. I have found code on this and other sites, but they do not work. Any help in finding the correct solution would be much appreciated. I feel that the bellow are close, but that I am missing something. Thank You.
The bellow code I adapted from here but it returns an error message about a missing T_VARIABLE on line 12.
‘;
print_r($curl_info);? >
The bellow is from curl through proxy returns no content
$proxy = “66. 39:80”;
$proxy = explode(‘:’, $proxy);
$url = “$_POST[1]”;
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_PROXY, $proxy[0]);
curl_setopt($ch, CURLOPT_PROXYPORT, $proxy[1]);
curl_setopt($ch, CURLOPT_HEADER, 1);
$exec = curl_exec($ch);
echo curl_error($ch);
print_r(curl_getinfo($ch));
echo $exec;? >
is currently live on but also does not work.
UPDATE:
Thank you for all your help, I made the above changes. Now it only returns a blank screen.
$url = $_POST[‘1’];
curl_setopt ($ch, CURLOPT_HEADER, 1);
$curl_scraped_page = curl_exec($ch);
echo $curl_scraped_page;? >

Frequently Asked Questions about curlopt_proxy

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