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> Emulating an HTTP session (with cookies passing) between request is more complicated for instance.

Are cookie jars not sufficient for that? Curl supports those on its own.

Thanks four your reply - just had restful services in my mind when writing my response.

At that point wouldn't you want to use Python, Node, Ruby, etc?

Using a binary can be (in my experience, 99% of the time) an enormous convenience and performance boost over including a whole runtime for those languages.