How to send plantuml description to the plantuml server from command line?

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asked Sep 13 in Question / help by dragondive (300 points)

I want to use the PlantUML server to generate a diagram from a text file. I want to use only the command line and avoid writing code in another programming language, if possible. As suggested in this question How to curl to plantuml-server - PlantUML Q&A, I tried the following with a standard "Alice -> Bob: hello" diagram:

cat hello.puml |  curl -v -H "Content-Type: text/plain" --data-binary @- http://www.plantuml.com/plantuml/png/ --output - > out.png

But this doesn't generate a valid diagram. What did I miss here? 

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