Unix & Linux Asked by user103567 on February 12, 2021
I realized that in linux as well as in many programs, one can set http_proxy and https_proxy. I see many guides suggest:
http_proxy = http://host:port
https_proxy = https://host:port
I have serveral questions:
How a program determine which proxy, http or https, to connect? I tested in a docker alphine image to find out that wget get https://google.com through http_proxxy. It seems that this doesn’t depend on which protocol to use.
What is the meaning of http, https in front of host:port? Does it suggest which protocol to use to connect to the proxy server? As I find out I can actually use http://host:port for https_proxy. Besides, setting without http
http_proxxy = host:port
also works.
Thank you!
It's pretty confusing I agree. Some programs use just http_proxy and adjust the protocol as needed for HTTP/HTTPS requests.
This is what https://www.npmjs.com/package/proxy-agent does anyway.
Some other programs use both. HTTPS_PROXY for https requests and HTTP_PROXY for http requests.
But I think it makes sense for most programs to just use a single HTTP_PROXY and adjust the protocol as needed. I can't see a good use case for using both and having separate proxies for HTTP vs HTTPS in this day and age.
Answered by nhooyr on February 12, 2021
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