With an empty API headers config like

```js
	"API": {
		"HTTPHeaders": {}
	},
```

running collect-profiles.sh shows connection errors when trying to POST to `/debug/pprof-mutex/` end point when using `localhost`.

The same errors do not occur when using `127.0.0.1`

License: MIT
Signed-off-by: Oli Evans <oli@tableflip.io>