I use simple shell script to test some http server that process POST requests.
Usually it looks like:

```
echo "param1=value1&param2=value2" | POST localhost/service

```

But now I want to pass also some json in POST **body** and that's where I missing point completely.

*man POST* and google did't help much also.

Seems it must be either very simple or completely impossible.

Thanks for help.