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I want to execute a POST request with custom headers over HTTPS from a pod in our kubernetes cluster, which is running openjdk11-jre with alpine as base image (adoptopenjdk/openjdk11:jre-11.0.11_9-alpine to be exact).

With this image curl or wget are not available and nc doesn't support HTTPS. I already tried to achieve something with jrunscript which comes with the jre but was only able to send a GET with cat('https://example.com').

Of course one way would be to copy an executable or a compiled Java class into the pod, over which I could send the request but I'd prefer a one-liner that is ready to go.

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  • So go through what is installed in your container (we cannot know this), and see if you can use anything for HTTPS. E.g. is openssl available? Then you can do openssl s_client. Etc. Otherwise you need some Java.
    – dirkt
    Nov 22, 2021 at 9:39
  • Our image just has a jar file copied into it. So it's just the plain Alpine image with a JRE (just added the versions). I currently didn't find any program that would fit but often people here find clever ways to utilize existing programs for some command line magic :)
    – das Keks
    Nov 22, 2021 at 12:16

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I noticed that there is a busybox binary in the Alpine image which contains a stripped-down version of wget. Unfortunately it does not allow to send PUT or DELETE requests but for POST this worked:

wget -qO - --post-data '' --header 'MyHeader: 123' https://example.com/

Or alternatively if there is no wget link to busybox

busybox wget -qO - --post-data '' --header 'MyHeader: 123' https://example.com/
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