Why Sudo Curl Ignores Proxy Settings?
$ Echo $Http_Proxy $ Curl -v * About to Connect() to Proxy My. Proxy. Com # Correct Downloading $ Sudo Echo $Http_Proxy $Sudo Curl -v # Hanging. Last Command...
$ echo $http_proxy
$ curl -v
* About to connect() to proxy my.proxy.com
# Correct downloading
$ sudo echo $http_proxy
$sudo curl -v
# Hanging.
Last command doesn't use proxy. Why?
$su
$curl -v
Is also working correctly.
2 Answers
This doesn't do what you think it does:
sudo echo $http_proxy
With that, $http_proxy is expanded by the shell before sudo gets called, so it picks up your own environment.
A plain su (without -, -l or --login) also keeps (most of) the environment intact, so the proxy settings are inherited.
sudo does not preserve the environment by default. You could try either:
sudo -E curl ...
(to preserve the whole environment, if you're allowed to do that), or
sudo http_proxy=$http_proxy curl ...
to only pass http_proxy along (safer).
Specify the host as:
- a command line argument (-x)
- on the command line (var=moo command)
- or export it to your environment
$ curl -x
87.98.136.60
$ curl
84.202.82.63
$ http_proxy= curl
87.98.136.60
$ http_proxy= curl
84.202.82.63
$ export http_proxy= curl
87.98.136.60
$ http_proxy= sudo curl
84.202.82.63
$ export http_proxy= sudo -E curl
Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.
