By looking through the git history of your project, it doesn't seem you got it correct the first time either. I don't think gluing "UNIX tools" together biggest strength is "make it work fast & on the first try", but "have independent tools that does 'one thing' well".

In relation to your tool, I think curl provides very many more features that are easily accessible through command flags than the limited subset of HTTP capabilities you expose (for example, basic auth or different set of headers). The same argument goes for mailing, setting headers or such.

With that said, tools that does one thing and does it well are the ones that gets used, personally I'd just prefer it to be function in <your-shell> instead :)