**********************
network daemon testing
**********************
Is the server online?
=====================
To test whether a server is accepting
connections, you can combine the **-v** and
**-z** flags together:
.. tab:: Unix
.. code-block:: sh
pync -vz host.example.com 80
.. tab:: Windows
.. code-block:: sh
py -m pync -vz host.example.com 80
.. tab:: Python
.. code-block:: python
import pync
pync.run('-vz host.example.com 80')
The **-z** flag tells **pync** to close the
connection immediately (zero input/output)
while the **-v** flag prints a connection
success or failure message to the console:
.. tab:: Success
.. code-block:: sh
...
Connection to host.example.com 80 port [tcp/http] succeeded!
.. tab:: Failure
.. code-block:: sh
...
pync: connect to host.example.com port 80 (tcp) failed: Connection refused
You can also test multiple ports on a machine
by passing a range of port numbers. See
:doc:`../usage/port-scanning` for more.
Is the server responding?
=========================
It can also be useful to interact with a server
to test how it responds to certain requests.
For example, a web server should respond to
a HTTP GET request by sending back a HTTP
status code and the contents of the requested
web page (if it exists).
1. Connect to a web server:
.. tab:: Unix
.. code-block:: sh
pync host.example.com 80
.. tab:: Windows
.. code-block:: sh
py -m pync host.example.com 80
.. tab:: Python
.. code-block:: python
import pync
pync.run('host.example.com 80')
2. Once connected, send a GET request for the
home page by typing the following and
hitting enter a couple of times:
.. code-block:: sh
GET / HTTP/1.1
If all goes well, the server should respond
with a HTTP 200 OK status along with any HTTP
headers and the contents of the requested web
page (index.html in this case):
.. code-block:: sh
HTTP/1.1 200 OK
Server: host.example.com
Content-Type: text/html; charset=UTF-8
...
Example Web Page!
.. raw:: html
:SEE ALSO:
* :doc:`../options/verbose`
* :doc:`../options/zero-io`
* :doc:`http`
* :doc:`../usage/talking-to-servers`