09-17-2001
General Proxy Question
This is quite a general question:
I am trying to detect whether people accessing my network are using a proxy server. This is *not* to ensure that web pages are not cached!
The only way that I can think of doing this is to intercept at packet level and examine the source port for high-numbers. But even this is no guarantee. Humph.
Does anybody have any suggestions. The solution must be automated, ie. I can't rely on users filling out a form correctly!
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LEARN ABOUT MOJAVE
curlopt_httpproxytunnel
CURLOPT_HTTPPROXYTUNNEL(3) curl_easy_setopt options CURLOPT_HTTPPROXYTUNNEL(3)
NAME
CURLOPT_HTTPPROXYTUNNEL - tunnel through HTTP proxy
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTPPROXYTUNNEL, long tunnel);
DESCRIPTION
Set the parameter to 1 to make libcurl tunnel all operations through the HTTP proxy. There is a big difference between using a proxy and to
tunnel through it. If you don't know what this means, you probably don't want this tunneling option.
Tunneling essentially means that a CONNECT is sent to the proxy, asking it to connect to a remote host on a specific port number and then
the traffic is just passed through the proxy. Proxies tend to whitelist specific port numbers it allows CONNECT requests to and often only
port 80 and 443 are allowed.
When using this, it only makes sense to use CURLOPT_PROXYTYPE(3) set to a HTTP proxy.
To suppress proxy CONNECT response headers from user callbacks use CURLOPT_SUPPRESS_CONNECT_HEADERS(3).
DEFAULT
0
PROTOCOLS
All network protocols
EXAMPLE
TODO
AVAILABILITY
Always
RETURN VALUE
Returns CURLE_OK
SEE ALSO
CURLOPT_PROXY(3), CURLOPT_PROXYTYPE(3), CURLOPT_PROXYPORT(3),
libcurl 7.54.0 April 28, 2016 CURLOPT_HTTPPROXYTUNNEL(3)