### Relevant log output

```shell
Running tests/proxy_tests.rs (target/debug/deps/proxy_tests-346a6ea17328a77f)

running 3 tests
test wrong_port_proxy_test ... ok
test wrong_protocol_proxy_test ... ok
test ok_proxy_test ... FAILED

failures:

---- ok_proxy_test stdout ----
thread 'ok_proxy_test' panicked at 'Unexpected failure.
code-65
stderr=""```
command=`"/home/ardi/repos/selenium/rust/target/debug/selenium-manager" "--browser" "chrome" "--proxy" "http://127.0.0.1:39559"`
code=65
stdout="ERROR\terror sending request for url (https://chromedriver.storage.googleapis.com/LATEST_RELEASE): error trying to connect: unsuccessful tunnel\n"
stderr=""
', /rustc/511364e7874dba9649a264100407e4bffe7b5425/library/core/src/ops/function.rs:250:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    ok_proxy_test

test result: FAILED. 2 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s

error: test failed, to rerun pass `--test proxy_tests`