Curl usage

A simple curl command to check, whether your HTTP service works as you want would be

curl -vk https://<IP of your server>[:<Port of your Service>]<URI of your Service>

A full example could be

curl -vk https://192.168.10.15/path/to/my/app

This would result in an HTTP request

GET /path/to/my/app HTTP/1.1 Host: 192.168.10.15 Connection: keep-alive ...

If your server uses name-based Virtual Hosts, you have to adjust the Host-header field, to get the correct response:

curl -vk https//192.168.10.15/path/to/my/app -H "Host: myapp.example.com"

You can set more custom headers with `-H`, if necessary.

curl can only be used within the advanced shell (=Bash). A good practice to check for the health status of your app depends on you. A simple HTTP monitor, which checks the response code of your app is better than a simple tcp check, i.e.

HTTP/1.(0|1) (200|404|403)

would check for a HTTP/1.0 or HTTP/1.1 response, accepting response codes 200, 404 and 403 - for whatever reason this may make sense...

A better approach is a built-in health check in your applications, where the application owner has created an health endpoint, which is callable via HTTP, i.e.

curl -vk https//192.168.10.15/status/health

returns

HTTP/1.1 200 OK ... Content-Type: application/json {"status": "ok"}

These are just some ideas, based on you questions. From my experience such advanced monitors are rare. In the cases I know of, they are mostly simple monitors that only check for response status code 200.

curl -vk https://..............

it will show deatils of the tls session setup

Hi, 

Thanks for quick response.

But, if we use "k" (-vk) then this means ignore to check the SSL Certificate status on pool member.

if we want to check whether application team is offloading any ssl certificate on backend server or not OR if they are offloading then is certificate valid or expired , how to ensure this using curl command.

Hi, 
I am adding a very important usage for curl command. 

curl -Ik https://<Virtual_server_Ip>/path1/path2/........

This command shows you accessing Virtual server throughout Bigip itself , this very very useful when you need to test the virtual server from internal network and isolate the external one , also if there are an issue or something drops packets on your Bigip like ( AWAF , APM ... ) this will confirm that something configured wrong in bigip or Virtual server Configuration and it needs to be reviewed and modified.

Also you can see logs from this curl test: 
When doing this Curl command, Bigip will use its external self IP address as a source IP and the destination is the Virtual server. 

Take this note beside svs & boneyard zamroni777 eagertolearn 

thanks