Individual skill

form-https

Use when reviewing HTML forms, fetch/XHR calls, and form action attributes to ensure data is submitted exclusively over HTTPS.

skills/form-https/SKILL.md

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Repository stars (not skill ratings): 74,675
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frontend Repository topic
front-end-development Repository topic
front-end-developer-tool Repository topic
guidelines Repository topic
checklist Repository topic
reference Repository topic
web-development Repository topic
html Repository topic
css Repository topic
javascript Repository topic
data Derived category

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# Submit forms over HTTPS

A login form that posts credentials to an HTTP endpoint sends usernames and passwords as plain text over the network — anyone on the same Wi-Fi, the ISP, or a network proxy can read them without any special tools.

## Quick Reference

- Every `<form action>` URL must use `https://` — never `http://`
- Forms without an explicit `action` attribute submit to the current page URL — ensure the page itself is on HTTPS
- Check `fetch()` and `XMLHttpRequest` calls in JavaScript — data posted to `http://` endpoints is unencrypted
- Browsers show a 'Not Secure' warning in the address bar when a form is on an HTTP page
- From Chrome 86+, autofill is disabled on HTTP forms to protect credentials

## Check