Wait for an HTTP endpoint to return 200 OK with Bash and curl

wait_for_http_200.sh

bash -c 'while [[ "$(curl -s -o /dev/null -w ''%{http_code}'' localhost:9000)" != "200" ]]; do sleep 5; done'

# also check https://gist.github.com/rgl/c2ba64b7e2a5a04d1eb65983995dce76

timeout 300 bash -c 'while [[ "$(curl -s -o /dev/null -w ''%{http_code}'' localhost:9000)" != "200" ]]; do sleep 5; done' || false

version with 5 minutes of timeout: if timeout is reached, it exits with error (1)

For TLS add --insecure flag for self signed certificates
timeout 300 bash -c 'while [[ "$(curl --insecure -s -o /dev/null -w ''%{http_code}'' https://localhost:9000)" != "200" ]]; do sleep 5; done'

How to print status code before sleep?

This is awesome--thanks!

Edit: i think this is the best https://github.com/nev7n/wait_for_response

Here a script with timeout

#!/bin/bash
set -eux

declare -r HOST="http://google.com"

wait-for-url() {
    echo "Testing $1"
    timeout -s TERM 45 bash -c \
    'while [[ "$(curl -s -o /dev/null -L -w ''%{http_code}'' ${0})" != "200" ]];\
    do echo "Waiting for ${0}" && sleep 2;\
    done' ${1}
    echo "OK!"
    curl -I $1
}
wait-for-url http://${HOST}

Testing http://localhost:8000
-bash: timeout: command not found
OK!
i don't think that the timeout command is on macOS

Hi all,

I turned this into a script allowing for various of these behaviors to be configured via parameters.

I'm using it in our CI pipelines to make sure that APIs served by containers are alive before performing the next steps in the pipeline.

I'm very far from being a Bash expert and PR for improvements are very welcome.

Of course feel free the fork if you wish to :)

Thanks! Hope someone could make it to be a github action.

There is https://github.com/nev7n/wait_for_response, however, that doesn't support all the options available in curl.

Hi all,

Here a solution that worked to me. In my case I used it for an initContainer:

sh -c 'while (( curl -s -o /dev/null -w %{http_code} https://google.com/ != "200" && curl -s -o /dev/null -w %{http_code} https://google.com/ != "301")); do sleep 1; done;'

Thanks!
I forked your version and extended it to a script that can be used right away. We use it in the CI to wait for services until they are available.

https://gist.github.com/eisenreich/195ab1f05715ec86e300f75d007d711c

There is https://github.com/nev7n/wait_for_response, however, that doesn't support all the options available in curl.

Thank you that looks neat