How can I debug a HTTP POST in Chrome?

1. Go to Chrome Developer Tools (Chrome Menu -> More Tools -> Developer Tools)
2. Choose "Network" tab
3. Refresh the page you're on
4. You'll get list of http queries that happened, while the network console was on. Select one of them in the left
5. Choose "Headers" tab

Voila!

You can filter for HTTP POST requests with the Chrome DevTools. Just do the following:

1. Open Chrome DevTools (Cmd+Opt+I on Mac, Ctrl+Shift+I or F12 on Windows) and click on the "Network" tab
2. Click on the "Filter" icon
3. Enter your filter method: method:POST
4. Select the request you want to debug
5. View the details of the request you want to debug

Screenshot

Tested with Chrome Version 53.