cargo test fails

`cargo test` fails for me with this error -

``` bash
running 2 tests
test post_backend ... FAILED
test get_backend ... FAILED

failures:

---- post_backend stdout ----
thread 'post_backend' panicked at 'called `Result::unwrap()` on an `Err` value: Io(Error { repr: Os { code: 61, message: "Connection refused" } })', ../src/libcore/result.rs:785

---- get_backend stdout ----
thread 'get_backend' panicked at 'called `Result::unwrap()` on an `Err` value: Io(Error { repr: Os { code: 61, message: "Connection refused" } })', ../src/libcore/result.rs:785
note: Run with `RUST_BACKTRACE=1` for a backtrace.
```

Am I missing something? I am running rustup with stable channel -

```
$ cargo -V
cargo 0.11.0-nightly (259324c 2016-05-20)
$ rustc -V
rustc 1.10.0 (cfcb716cf 2016-07-03)
```

Start by running `cargo test` with the reported Rust toolchain and inspect the `post_backend` and `get_backend` tests to identify which service or endpoint refuses the connection. Done means both tests run successfully without the connection-refused panic.

Written by the indexing model from the issue text.