proby 1.0.2

Check whether hosts are reachable on certain ports and return result on HTTP
proby-1.0.2 is not a library.


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Check whether hosts are reachable on certain ports and return result on HTTP

Its intended purpose is to be a bridge server for services that can only probe container or application health on HTTP. Oh, and it's just a single binary that works everywhere!

What is this

This tool is a very simple web server that takes requests on HTTP to check whether they are connectable on a provided port. It returns 200 OK by default if the port is connectable and 503 Service Unavailable if it isn't.


Just grab one of the statically linked builds from the Releases page and you're good to go!


All you have to do to run proby is to just call it:


If you don't like the default interface and port of proby, you can change it like this:

proby -i -p 9000



This makes proby listen only on the local loopback interface at port 9000.

Example request for checking whether port 1337 is connectable on host

curl localhost:8080/example:1337
example:1337 is connectable

This will return 200 if it is connectable and 503 if it isn't.

You can also use IPv4s or IPv6s, of course:

curl localhost:8080/
curl localhost:8080/2001:4860:4860::8888:1337


If you'd like to customize the return codes, you can do so by setting the request parameters good and bad like so:

curl localhost:8080/

You can also configure a timeout (in seconds) using:

curl localhost:8080/

The default timeout is one second.

CLI usage

proby 1.0.2
Sven-Hendrik Haase <>
Check whether hosts are reachable on certain ports and return result on HTTP

    proby [FLAGS] [OPTIONS]

    -h, --help       Prints help information
    -q, --quiet      Be quiet (log nothing)
    -V, --version    Prints version information
    -v, --verbose    Be verbose (log data of incoming and outgoing requests). If given twice it will also log the body

    -i, --interfaces <interfaces>...    Interface to bind to [default:]
    -p, --port <port>                   Port on which to listen [default: 8080]


You need a recent stable version of Rust and Cargo installed.

Then just type

cargo build --release

After the build, a binary will appear here: target/release/proby.


This is mostly a note for me on how to release this thing:

  • cargo release --dry-run
  • cargo release
  • Releases will automatically be deployed by Github Actions.
  • Docker images will automatically be built by Docker Hub.
  • Update AUR package.