Setting http_proxy for Chromium in shell

Solution 1:

You have to use the --proxy-server argument.

From the Chromium Network Settings page:

--proxy-server=<scheme>=<uri>[:<port>];.. | <uri>[:<port>] | "direct://"
This tells Chrome to use a custom proxy configuration. You can specify a custom proxy configuration in three ways:

1) By providing a semi-colon-separated mapping of list scheme to url/port pairs.
For example, you can specify:
--proxy-server="http=foopy:80;ftp=foopy2"
to use HTTP proxy "foopy:80" for http URLs and HTTP proxy "foopy2:80" for ftp URLs.

2) By providing a single uri with optional port to use for all URLs.
For example:
--proxy-server="foopy:8080"
will use the proxy at foopy:8080 for all traffic.

3) By using the special "direct://" value.
--proxy-server="direct://"
will cause all connections to not use a proxy.

You can also have a look at this List of Chromium Command Line Switches.