HTTP Safety Doesn't Happen by Accident
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Before the days of CSS, JavaScript, AJAX, and Web 2.0, there were two main ways for a Web user to tell their browser to make a request to a Web server:
Clicking on a link to a different page, and clicking on a button to submit a form.
Read this post in full on the thoughtbot blog: https://robots.thoughtbot.com/http-safety-doesnt-happen-by-accident