How to set Http_proxy and Https_proxy environment variables?

How do I export a proxy in Linux?

How to export the proxy settings in a Linux distribution like Ubuntu?

I need to export the proxy settings so that I can use it in a different system. Is there any simple way? I mean how can I export the proxy settings for a Linux system and use it on another Linux distro? The easiest method, but not the only one, is to set the system proxy settings in /etc/environment.bashprofile. The content of this file should be:
Export PROXY=":". Then source the file using ~/.

How to set proxy in Linux for all users?

I have tried to enable proxy in /etc/sysconfig/iptables but it's not the way I want.

I want all users in my Linux Centos 6.4 machine (with their default users and passwords) can use squid through localhost on Port 3128 for http. This is how I am using squid from CentOS machine itself but I want the users to access through a browser or using lynx or any other way on the centOS, but it always says "Proxy connection uses HTTP port 80".

Thanks! I don't think this is possible. Your squid instance has to be set up as a "reverse" proxy - ie it will take incoming connections one port and forward them elsewhere.

The reason you can get the error message you mention - Proxy connection uses HTTP port 80 - is because an HTTP request made to your proxy server must include a Host header. In order for your machine to be able to answer these requests without getting confused by other requests it is necessary that it set the Host header properly. This means that it does the same for incoming requests as you do for outgoing requests.

To avoid the error message you mention it is possible to either turn off the default proxy configuration entirely or set up two different proxy servers - one for incoming requests and one for outgoing requests - depending on how you run squid. The second method is also useful if you want more control over what requests to forward. Consider you have many different apps on your Linux box that need to talk to the Internet via proxy. What if one of them breaks. You wouldn't want the others to have to stop working until you've traced the problem to the broken one.

In order to be able to set up two proxies running on the same port on your machine you need to configure your HTTP clients (ie every web browser you run on the machine) to use two different ports for the incoming requests - one for the normal proxy and one for the reverse proxy. It then becomes possible to point two URLs at the reverse proxy with distinct Host headers - eg one to proxy.company.com:80 and another to proxy2.